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Python rearrange a list without changing the values and making every rearrangment different

I want to write a function that get two integers. The integers indicate how many strings of either of the two chars appears in a string.
For example:
my_func(x,y): x amount of 'u' and y amount of 'r'.
my_func(2,3) is a string 'uurrr'
And the goal of the function is to write all the possible combinations of that string without changing the amount of x,y and every rearrangement is different:
Example:
my_func(1,1) will return: 'ru', 'ur'
my_func(1,2) will return: 'urr', 'rur', 'rru'
my_func(2,2) will return: 'uurr', 'ruru', 'rruu','urur', 'ruur', 'urru'
What I tried without covering all cases:
RIGHT = 'r'
UP = 'u'
def factorial(m):
if m>1:
return factorial(m-1)*m
else:
return 1
def binom(n,k):
return int(factorial(n)/(factorial(k)*factorial(n-k)))
def up_and_right(n, k, lst):
if n-k == 1 or n-k==-1 or n-k == 0 or n==1 or k==1:
num_of_ver = n+k
else:
num_of_ver = binom(n+k,2)
first_way_to_target = RIGHT*n + UP*k
lst.append(first_way_to_target)
way_to_target = first_way_to_target
for i in range(num_of_ver-1):
for j in range(n+k-1,0,-1):
if way_to_target[j]==UP and way_to_target[j-1]==RIGHT:
way_to_target = list(way_to_target)
way_to_target[j-1] = UP
way_to_target[j] = RIGHT
way_to_target = ''.join(way_to_target)
lst.append(way_to_target)
return lst
Thanks in advance!

Use itertools.permutations to get all the rearrangements, make a set of them to eliminate duplicates (because e.g. swapping two rs around counts as a separate permutation but doesn't change anything), and then join them back into strings because permutations returns character tuples instead.
This demonstration at the REPL should give you enough to write your function:
>>> import itertools
>>> [''.join(p) for p in set(itertools.permutations('u' * 2 + 'r' * 2))]
['uurr', 'ruur', 'ruru', 'rruu', 'urur', 'urru']

how to generate random integers with length 8 and unique [duplicate]

How do I generate a string of size N, made of numbers and uppercase English letters such as:
6U1S75
4Z4UKK
U911K4

Answer in one line:
''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(N))
or even shorter starting with Python 3.6 using random.choices():
''.join(random.choices(string.ascii_uppercase + string.digits, k=N))
A cryptographically more secure version: see this post
''.join(random.SystemRandom().choice(string.ascii_uppercase + string.digits) for _ in range(N))
In details, with a clean function for further reuse:
>>> import string
>>> import random
>>> def id_generator(size=6, chars=string.ascii_uppercase + string.digits):
... return ''.join(random.choice(chars) for _ in range(size))
...
>>> id_generator()
'G5G74W'
>>> id_generator(3, "6793YUIO")
'Y3U'
How does it work ?
We import string, a module that contains sequences of common ASCII characters, and random, a module that deals with random generation.
string.ascii_uppercase + string.digits just concatenates the list of characters representing uppercase ASCII chars and digits:
>>> string.ascii_uppercase
'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
>>> string.digits
'0123456789'
>>> string.ascii_uppercase + string.digits
'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
Then we use a list comprehension to create a list of 'n' elements:
>>> range(4) # range create a list of 'n' numbers
[0, 1, 2, 3]
>>> ['elem' for _ in range(4)] # we use range to create 4 times 'elem'
['elem', 'elem', 'elem', 'elem']
In the example above, we use [ to create the list, but we don't in the id_generator function so Python doesn't create the list in memory, but generates the elements on the fly, one by one (more about this here).
Instead of asking to create 'n' times the string elem, we will ask Python to create 'n' times a random character, picked from a sequence of characters:
>>> random.choice("abcde")
'a'
>>> random.choice("abcde")
'd'
>>> random.choice("abcde")
'b'
Therefore random.choice(chars) for _ in range(size) really is creating a sequence of size characters. Characters that are randomly picked from chars:
>>> [random.choice('abcde') for _ in range(3)]
['a', 'b', 'b']
>>> [random.choice('abcde') for _ in range(3)]
['e', 'b', 'e']
>>> [random.choice('abcde') for _ in range(3)]
['d', 'a', 'c']
Then we just join them with an empty string so the sequence becomes a string:
>>> ''.join(['a', 'b', 'b'])
'abb'
>>> [random.choice('abcde') for _ in range(3)]
['d', 'c', 'b']
>>> ''.join(random.choice('abcde') for _ in range(3))
'dac'

This Stack Overflow quesion is the current top Google result for "random string Python". The current top answer is:
''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(N))
This is an excellent method, but the PRNG in random is not cryptographically secure. I assume many people researching this question will want to generate random strings for encryption or passwords. You can do this securely by making a small change in the above code:
''.join(random.SystemRandom().choice(string.ascii_uppercase + string.digits) for _ in range(N))
Using random.SystemRandom() instead of just random uses /dev/urandom on *nix machines and CryptGenRandom() in Windows. These are cryptographically secure PRNGs. Using random.choice instead of random.SystemRandom().choice in an application that requires a secure PRNG could be potentially devastating, and given the popularity of this question, I bet that mistake has been made many times already.
If you're using python3.6 or above, you can use the new secrets module as mentioned in MSeifert's answer:
''.join(secrets.choice(string.ascii_uppercase + string.digits) for _ in range(N))
The module docs also discuss convenient ways to generate secure tokens and best practices.

Simply use Python's builtin uuid:
If UUIDs are okay for your purposes, use the built-in uuid package.
One Line Solution:
import uuid; uuid.uuid4().hex.upper()[0:6]
In Depth Version:
Example:
import uuid
uuid.uuid4() #uuid4 => full random uuid
# Outputs something like: UUID('0172fc9a-1dac-4414-b88d-6b9a6feb91ea')
If you need exactly your format (for example, "6U1S75"), you can do it like this:
import uuid
def my_random_string(string_length=10):
"""Returns a random string of length string_length."""
random = str(uuid.uuid4()) # Convert UUID format to a Python string.
random = random.upper() # Make all characters uppercase.
random = random.replace("-","") # Remove the UUID '-'.
return random[0:string_length] # Return the random string.
print(my_random_string(6)) # For example, D9E50C

A simpler, faster but slightly less random way is to use random.sample instead of choosing each letter separately, If n-repetitions are allowed, enlarge your random basis by n times e.g.
import random
import string
char_set = string.ascii_uppercase + string.digits
print ''.join(random.sample(char_set*6, 6))
Note:
random.sample prevents character reuse, multiplying the size of the character set makes multiple repetitions possible, but they are still less likely then they are in a pure random choice. If we go for a string of length 6, and we pick 'X' as the first character, in the choice example, the odds of getting 'X' for the second character are the same as the odds of getting 'X' as the first character. In the random.sample implementation, the odds of getting 'X' as any subsequent character are only 6/7 the chance of getting it as the first character

import uuid
lowercase_str = uuid.uuid4().hex
lowercase_str is a random value like 'cea8b32e00934aaea8c005a35d85a5c0'
uppercase_str = lowercase_str.upper()
uppercase_str is 'CEA8B32E00934AAEA8C005A35D85A5C0'

From Python 3.6 on you should use the secrets module if you need it to be cryptographically secure instead of the random module (otherwise this answer is identical to the one of #Ignacio Vazquez-Abrams):
from secrets import choice
import string
''.join([choice(string.ascii_uppercase + string.digits) for _ in range(N)])
One additional note: a list-comprehension is faster in the case of str.join than using a generator expression!

A faster, easier and more flexible way to do this is to use the strgen module (pip install StringGenerator).
Generate a 6-character random string with upper case letters and digits:
>>> from strgen import StringGenerator as SG
>>> SG("[\u\d]{6}").render()
u'YZI2CI'
Get a unique list:
>>> SG("[\l\d]{10}").render_list(5,unique=True)
[u'xqqtmi1pOk', u'zmkWdUr63O', u'PGaGcPHrX2', u'6RZiUbkk2i', u'j9eIeeWgEF']
Guarantee one "special" character in the string:
>>> SG("[\l\d]{10}&[\p]").render()
u'jaYI0bcPG*0'
A random HTML color:
>>> SG("#[\h]{6}").render()
u'#CEdFCa'
etc.
We need to be aware that this:
''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(N))
might not have a digit (or uppercase character) in it.
strgen is faster in developer-time than any of the above solutions. The solution from Ignacio is the fastest run-time performing and is the right answer using the Python Standard Library. But you will hardly ever use it in that form. You will want to use SystemRandom (or fallback if not available), make sure required character sets are represented, use unicode (or not), make sure successive invocations produce a unique string, use a subset of one of the string module character classes, etc. This all requires lots more code than in the answers provided. The various attempts to generalize a solution all have limitations that strgen solves with greater brevity and expressive power using a simple template language.
It's on PyPI:
pip install StringGenerator
Disclosure: I'm the author of the strgen module.

Based on another Stack Overflow answer, Most lightweight way to create a random string and a random hexadecimal number, a better version than the accepted answer would be:
('%06x' % random.randrange(16**6)).upper()
much faster.

I thought no one had answered this yet lol! But hey, here's my own go at it:
import random
def random_alphanumeric(limit):
#ascii alphabet of all alphanumerals
r = (range(48, 58) + range(65, 91) + range(97, 123))
random.shuffle(r)
return reduce(lambda i, s: i + chr(s), r[:random.randint(0, len(r))], "")

If you need a random string rather than a pseudo random one, you should use os.urandom as the source
from os import urandom
from itertools import islice, imap, repeat
import string
def rand_string(length=5):
chars = set(string.ascii_uppercase + string.digits)
char_gen = (c for c in imap(urandom, repeat(1)) if c in chars)
return ''.join(islice(char_gen, None, length))

This method is slightly faster, and slightly more annoying, than the random.choice() method Ignacio posted.
It takes advantage of the nature of pseudo-random algorithms, and banks on bitwise and and shift being faster than generating a new random number for each character.
# must be length 32 -- 5 bits -- the question didn't specify using the full set
# of uppercase letters ;)
_ALPHABET = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789'
def generate_with_randbits(size=32):
def chop(x):
while x:
yield x & 31
x = x >> 5
return ''.join(_ALPHABET[x] for x in chop(random.getrandbits(size * 5))).ljust(size, 'A')
...create a generator that takes out 5 bit numbers at a time 0..31 until none left
...join() the results of the generator on a random number with the right bits
With Timeit, for 32-character strings, the timing was:
[('generate_with_random_choice', 28.92901611328125),
('generate_with_randbits', 20.0293550491333)]
...but for 64 character strings, randbits loses out ;)
I would probably never use this approach in production code unless I really disliked my co-workers.
edit: updated to suit the question (uppercase and digits only), and use bitwise operators & and >> instead of % and //

Use Numpy's random.choice() function
import numpy as np
import string
if __name__ == '__main__':
length = 16
a = np.random.choice(list(string.ascii_uppercase + string.digits), length)
print(''.join(a))
Documentation is here http://docs.scipy.org/doc/numpy-1.10.0/reference/generated/numpy.random.choice.html

I'd do it this way:
import random
from string import digits, ascii_uppercase
legals = digits + ascii_uppercase
def rand_string(length, char_set=legals):
output = ''
for _ in range(length): output += random.choice(char_set)
return output
Or just:
def rand_string(length, char_set=legals):
return ''.join( random.choice(char_set) for _ in range(length) )

Sometimes 0 (zero) & O (letter O) can be confusing. So I use
import uuid
uuid.uuid4().hex[:6].upper().replace('0','X').replace('O','Y')

>>> import string
>>> import random
the following logic still generates 6 character random sample
>>> print ''.join(random.sample((string.ascii_uppercase+string.digits),6))
JT7K3Q
No need to multiply by 6
>>> print ''.join(random.sample((string.ascii_uppercase+string.digits)*6,6))
TK82HK

I used this method to generate random string of length n from a -> z
import random
s = ''.join(random.choice([chr(i) for i in range(ord('a'),ord('z'))]) for _ in range(10))

Security Oriented Approach
Our recommendation for anything security related is to avoid "rolling you own" and to use the secrets module which is specifically vetted for security.
This is from the best practices section of the docs:
import string
import secrets
alphabet = string.ascii_letters + string.digits
password = ''.join(secrets.choice(alphabet) for i in range(8))
Since you specifically asked for uppercase letters, you can either substitute ascii_uppercase for ascii_letters, or just uppercase the password with:
password = password.upper()
Standard Approach Not Aiming for Security
The canonical approach to this problem (as specified) uses the choices() function in the random module:
>>> from random import choices
>>> from string import ascii_uppercase, digits
>>> population = ascii_uppercase + digits
>>> str.join('', choices(population, k=6))
'6JWF1H'

>>> import random
>>> str = []
>>> chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890'
>>> num = int(raw_input('How long do you want the string to be? '))
How long do you want the string to be? 10
>>> for k in range(1, num+1):
... str.append(random.choice(chars))
...
>>> str = "".join(str)
>>> str
'tm2JUQ04CK'
The random.choice function picks a random entry in a list. You also create a list so that you can append the character in the for statement. At the end str is ['t', 'm', '2', 'J', 'U', 'Q', '0', '4', 'C', 'K'], but the str = "".join(str) takes care of that, leaving you with 'tm2JUQ04CK'.
Hope this helps!

For those of you who enjoy functional python:
from itertools import imap, starmap, islice, repeat
from functools import partial
from string import letters, digits, join
from random import choice
join_chars = partial(join, sep='')
identity = lambda o: o
def irand_seqs(symbols=join_chars((letters, digits)), length=6, join=join_chars, select=choice, breakup=islice):
""" Generates an indefinite sequence of joined random symbols each of a specific length
:param symbols: symbols to select,
[defaults to string.letters + string.digits, digits 0 - 9, lower and upper case English letters.]
:param length: the length of each sequence,
[defaults to 6]
:param join: method used to join selected symbol,
[defaults to ''.join generating a string.]
:param select: method used to select a random element from the giving population.
[defaults to random.choice, which selects a single element randomly]
:return: indefinite iterator generating random sequences of giving [:param length]
>>> from tools import irand_seqs
>>> strings = irand_seqs()
>>> a = next(strings)
>>> assert isinstance(a, (str, unicode))
>>> assert len(a) == 6
>>> assert next(strings) != next(strings)
"""
return imap(join, starmap(breakup, repeat((imap(select, repeat(symbols)), None, length))))
It generates an indefinite [infinite] iterator, of joined random sequences, by first generating an indefinite sequence of randomly selected symbol from the giving pool, then breaking this sequence into length parts which is then joined, it should work with any sequence that supports getitem, by default it simply generates a random sequence of alpha numeric letters, though you can easily modify to generate other things:
for example to generate random tuples of digits:
>>> irand_tuples = irand_seqs(xrange(10), join=tuple)
>>> next(irand_tuples)
(0, 5, 5, 7, 2, 8)
>>> next(irand_tuples)
(3, 2, 2, 0, 3, 1)
if you don't want to use next for generation you can simply make it callable:
>>> irand_tuples = irand_seqs(xrange(10), join=tuple)
>>> make_rand_tuples = partial(next, irand_tuples)
>>> make_rand_tuples()
(1, 6, 2, 8, 1, 9)
if you want to generate the sequence on the fly simply set join to identity.
>>> irand_tuples = irand_seqs(xrange(10), join=identity)
>>> selections = next(irand_tuples)
>>> next(selections)
8
>>> list(selections)
[6, 3, 8, 2, 2]
As others have mentioned if you need more security then set the appropriate select function:
>>> from random import SystemRandom
>>> rand_strs = irand_seqs(select=SystemRandom().choice)
'QsaDxQ'
the default selector is choice which may select the same symbol multiple times for each chunk, if instead you'd want the same member selected at most once for each chunk then, one possible usage:
>>> from random import sample
>>> irand_samples = irand_seqs(xrange(10), length=1, join=next, select=lambda pool: sample(pool, 6))
>>> next(irand_samples)
[0, 9, 2, 3, 1, 6]
we use sample as our selector, to do the complete selection, so the chunks are actually length 1, and to join we simply call next which fetches the next completely generated chunk, granted this example seems a bit cumbersome and it is ...

(1) This will give you all caps and numbers:
import string, random
passkey=''
for x in range(8):
if random.choice([1,2]) == 1:
passkey += passkey.join(random.choice(string.ascii_uppercase))
else:
passkey += passkey.join(random.choice(string.digits))
print passkey
(2) If you later want to include lowercase letters in your key, then this will also work:
import string, random
passkey=''
for x in range(8):
if random.choice([1,2]) == 1:
passkey += passkey.join(random.choice(string.ascii_letters))
else:
passkey += passkey.join(random.choice(string.digits))
print passkey

this is a take on Anurag Uniyal 's response and something that i was working on myself.
import random
import string
oneFile = open('‪Numbers.txt', 'w')
userInput = 0
key_count = 0
value_count = 0
chars = string.ascii_uppercase + string.digits + string.punctuation
for userInput in range(int(input('How many 12 digit keys do you want?'))):
while key_count <= userInput:
key_count += 1
number = random.randint(1, 999)
key = number
text = str(key) + ": " + str(''.join(random.sample(chars*6, 12)))
oneFile.write(text + "\n")
oneFile.close()

import string
from random import *
characters = string.ascii_letters + string.punctuation + string.digits
password = "".join(choice(characters) for x in range(randint(8, 16)))
print password

import random
q=2
o=1
list =[r'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','s','0','1','2','3','4','5','6','7','8','9','0']
while(q>o):
print("")
for i in range(1,128):
x=random.choice(list)
print(x,end="")
Here length of string can be changed in for loop i.e for i in range(1,length)
It is simple algorithm which is easy to understand. it uses list so you can discard characters that you do not need.

I was looking at the different answers and took time to read the documentation of secrets
The secrets module is used for generating cryptographically strong random numbers suitable for managing data such as passwords, account authentication, security tokens, and related secrets.
In particularly, secrets should be used in preference to the default pseudo-random number generator in the random module, which is designed for modelling and simulation, not security or cryptography.
Looking more into what it has to offer I found a very handy function if you want to mimic an ID like Google Drive IDs:
secrets.token_urlsafe([nbytes=None])
Return a random URL-safe text string, containing nbytes random bytes. The text is Base64 encoded, so on average each byte results in approximately 1.3 characters. If nbytes is None or not supplied, a reasonable default is used.
Use it the following way:
import secrets
import math
def id_generator():
id = secrets.token_urlsafe(math.floor(32 / 1.3))
return id
print(id_generator())
Output a 32 characters length id:
joXR8dYbBDAHpVs5ci6iD-oIgPhkeQFk
I know this is slightly different from the OP's question but I expect that it would still be helpful to many who were looking for the same use-case that I was looking for.

A simple one:
import string
import random
character = string.lowercase + string.uppercase + string.digits + string.punctuation
char_len = len(character)
# you can specify your password length here
pass_len = random.randint(10,20)
password = ''
for x in range(pass_len):
password = password + character[random.randint(0,char_len-1)]
print password

I would like to suggest you next option:
import crypt
n = 10
crypt.crypt("any sring").replace('/', '').replace('.', '').upper()[-n:-1]
Paranoic mode:
import uuid
import crypt
n = 10
crypt.crypt(str(uuid.uuid4())).replace('/', '').replace('.', '').upper()[-n:-1]

Two methods :
import random, math
def randStr_1(chars:str, length:int) -> str:
chars *= math.ceil(length / len(chars))
chars = letters[0:length]
chars = list(chars)
random.shuffle(characters)
return ''.join(chars)
def randStr_2(chars:str, length:int) -> str:
return ''.join(random.choice(chars) for i in range(chars))
Benchmark :
from timeit import timeit
setup = """
import os, subprocess, time, string, random, math
def randStr_1(letters:str, length:int) -> str:
letters *= math.ceil(length / len(letters))
letters = letters[0:length]
letters = list(letters)
random.shuffle(letters)
return ''.join(letters)
def randStr_2(letters:str, length:int) -> str:
return ''.join(random.choice(letters) for i in range(length))
"""
print('Method 1 vs Method 2', ', run 10 times each.')
for length in [100,1000,10000,50000,100000,500000,1000000]:
print(length, 'characters:')
eff1 = timeit("randStr_1(string.ascii_letters, {})".format(length), setup=setup, number=10)
eff2 = timeit("randStr_2(string.ascii_letters, {})".format(length), setup=setup, number=10)
print('\t{}s : {}s'.format(round(eff1, 6), round(eff2, 6)))
print('\tratio = {} : {}\n'.format(eff1/eff1, round(eff2/eff1, 2)))
Output :
Method 1 vs Method 2 , run 10 times each.
100 characters:
0.001411s : 0.00179s
ratio = 1.0 : 1.27
1000 characters:
0.013857s : 0.017603s
ratio = 1.0 : 1.27
10000 characters:
0.13426s : 0.151169s
ratio = 1.0 : 1.13
50000 characters:
0.709403s : 0.855136s
ratio = 1.0 : 1.21
100000 characters:
1.360735s : 1.674584s
ratio = 1.0 : 1.23
500000 characters:
6.754923s : 7.160508s
ratio = 1.0 : 1.06
1000000 characters:
11.232965s : 14.223914s
ratio = 1.0 : 1.27
The performance of first method is better.

Generate random 16-byte ID containig letters, digits, '_' and '-'
os.urandom(16).translate((f'{string.ascii_letters}{string.digits}-_'*4).encode('ascii'))

import string, random
lower = string.ascii_lowercase
upper = string.ascii_uppercase
digits = string.digits
special = '!"£$%^&*.,##/?'
def rand_pass(l=4, u=4, d=4, s=4):
p = []
[p.append(random.choice(lower)) for x in range(l)]
[p.append(random.choice(upper)) for x in range(u)]
[p.append(random.choice(digits)) for x in range(d)]
[p.append(random.choice(special)) for x in range(s)]
random.shuffle(p)
return "".join(p)
print(rand_pass())
# #5U,#A4yIZvnp%51

If you want an easy-to-use but highly customisable key generator, use key-generator pypi package.
Here is the GitHub repo where you can find the complete documentation.
You can customise it to give a string jist like you want with many more options. Here's an example:
from key_generator.key_generator import generate
custom_key = generate(2, ['-', ':'], 3, 10, type_of_value = 'char', capital = 'mix', seed = 17).get_key()
print(custom_key) # ZLFdHXIUe-ekwJCu
Hope this helps :)
Disclaimer: This uses the key-generator library which I made.

Is there an easy way to get the number of repeating character in a word?

I'm trying to get how many any character repeats in a word. The repetitions must be sequential.
For example, the method with input "loooooveee" should return 6 (4 times 'o', 2 times 'e').
I'm trying to implement string level functions and I can do it this way but, is there an easy way to do this? Regex, or some other sort of things?

Original question: order of repetition does not matter
You can subtract the number of unique letters by the number of total letters. set applied to a string will return a unique collection of letters.
x = "loooooveee"
res = len(x) - len(set(x)) # 6
Or you can use collections.Counter, subtract 1 from each value, then sum:
from collections import Counter
c = Counter("loooooveee")
res = sum(i-1 for i in c.values()) # 6
New question: repetitions must be sequential
You can use itertools.groupby to group sequential identical characters:
from itertools import groupby
g = groupby("aooooaooaoo")
res = sum(sum(1 for _ in j) - 1 for i, j in g) # 5
To avoid the nested sum calls, you can use itertools.islice:
from itertools import groupby, islice
g = groupby("aooooaooaoo")
res = sum(1 for _, j in g for _ in islice(j, 1, None)) # 5

You could use a regular expression if you want:
import re
rx = re.compile(r'(\w)\1+')
repeating = sum(x[1] - x[0] - 1
for m in rx.finditer("loooooveee")
for x in [m.span()])
print(repeating)
This correctly yields 6 and makes use of the .span() function.
The expression is
(\w)\1+
which captures a word character (one of a-zA-Z0-9_) and tries to repeat it as often as possible.
See a demo on regex101.com for the repeating pattern.
If you want to match any character (that is, not only word characters), change your expression to:
(.)\1+
See another demo on regex101.com.

try this:
word=input('something:')
sum = 0
chars=set(list(word)) #get the set of unique characters
for item in chars: #iterate over the set and output the count for each item
if word.count(char)>1:
sum+=word.count(char)
print('{}|{}'.format(item,str(word.count(char)))
print('Total:'+str(sum))
EDIT:
added total count of repetitions

Since it doesn't matter where the repetition is occurring or which characters are being repeated, you can make use of the set data structure provided in Python. It will discard the duplicate occurrences of any character or an object.
Therefore, the solution would look something like this:
def measure_normalized_emphasis(text):
return len(text) - len(set(text))
This will give you the exact result.
Also, make sure to look out for some edge cases, which you should as it is a good practice.

I think your code is comparing the wrong things
You start by finding the last character:
char = text[-1]
Then you compare this to itself:
for i in range(1, len(text)):
if text[-i] == char: #<-- surely this is test[-1] to begin with?
Why not just run through the characters:
def measure_normalized_emphasis(text):
char = text[0]
emphasis_size = 0
for i in range(1, len(text)):
if text[i] == char:
emphasis_size += 1
else:
char = text[i]
return emphasis_size
This seems to work.

How to loop to generate string in sequence?

I am trying to create a loop where I can generate string using loop. What I am trying to achieve is that I want to create a small collection of strings starting from 1 character to up to 5 characters.
So, starting from sting 1, I want to go to 55555 but this is number so it seems easy if I just add them, but when it comes to alpha numeric, it gets tricky.
Here is explanation,
I have collection of alpha-numeric chars as string s = "123ABC" and what I want to do is that I want to create all possible 1 character string out of it, so I will have 1,2,3,A,B,C and after that I want to add one more digit in length of string so I can get 11, 12, 13 and so on until I get all possible combination out of it up to CA, CB, CC and I want to get it up to CCCCCC. I am confused in loop because I can get it to generate a temp sting but looping inside to rotate characters is tricky,
this is what I have done so far,
i = 0
strr = "123ABC"
while i < len(strr):
t = strr[0] * (i+1)
for q in range(0, len(t)):
# Here I need help to rotate more
pass
i += 1
Can anyone explain me or point me to resource where I can find solution for it?

You may want to use itertools.permutations function:
import itertools
chars = '123ABC'
for i in xrange(1, len(chars)+1):
print list(itertools.permutations(chars, i))
EDIT:
To get a list of strings, try this:
import itertools
chars = '123ABC'
strings = []
for i in xrange(1, len(chars)+1):
strings.extend(''.join(x) for x in itertools.permutations(chars, i))

This is a nested loop. Different depths of recursion produce all possible combinations.
strr = "123ABC"
def prod(items, level):
if level == 0:
yield []
else:
for first in items:
for rest in prod(items, level-1):
yield [first] + rest
for ln in range(1, len(strr)+1):
print("length:", ln)
for s in prod(strr, ln):
print(''.join(s))
It is also called cartesian product and there is a corresponding function in itertools.

How can I scramble a word with a factor?

I would like to scramble a word with a factor. The bigger the factor is, the more scrambled the word will become.
For example, the word "paragraphs" with factor of 1.00 would become "paaprahrgs", and it will become "paargarphs" with a factor of 0.50.
The distance from the original letter position and the number of scrambled letters should be taken into consideration.
This is my code so far, which only scrambles without a factor:
def Scramble(s):
return ''.join(random.sample(s, len(s)))
Any ideas?
P.S. This isn't an homework job - I'm trying to make something like this: http://d24w6bsrhbeh9d.cloudfront.net/photo/190546_700b.jpg

You could use the factor as a number of shuffling chars in the string around.
As the factor seem's to be between 0 and 1, you can multiply the factor with the string's length.
from random import random
def shuffle(string, factor):
string = list(string)
length = len(string)
if length < 2:
return string
shuffles = int(length * factor)
for i in xrange(shuffles):
i, j = tuple(int(random() * length) for i in xrange(2))
string[i], string[j] = string[j], string[i]
return "".join(string)
x = "computer"
print shuffle(x, .2)
print shuffle(x, .5)
print shuffle(x, .9)
coupmter
eocpumtr
rpmeutoc
If you want the first and the last characters to stay in place, simply split them and add them later on.
def CoolWordScramble(string, factor = .5):
if len(string) < 2:
return string
first, string, last = string[0], string[1:-1], string[-1]
return first + shuffle(string, factor) + last

You haven't defined what your "factor" should mean, so allow me to redefine it for you: A scrambling factor N (an integer) would be the result of swapping two random letters in a word, N times.
With this definition, 0 means the resulting word is the same as the input, 1 means only one pair of letters is swapped, and 10 means the swap is done 10 times.

You can make the "factor" roughly correspond to the number of times two adjacent letters of the word switch their positions (a transposition).
In each transposition, choose a random position (from 0 through the length-minus-two), then switch the positions of the letter at that position and the letter that follows it.

It could be implemented many ways, but here is my solution:
Wrote a function that just changes a letter's place:
def scramble(s):
s = list(s) #i think more easier, but it is absolutely performance loss
p = s.pop(random.randint(0, len(s)-1))
s.insert(random.randint(0, len(s)-1), p)
return "".join(s)
And wrote a function that apply to a string many times:
def scramble_factor(s, n):
for i in range(n):
s = scramble(s)
return s
Now we can use it:
>>> s = "paragraph"
>>> scramble_factor(s, 0)
'paragraph'
>>> scramble_factor(s, 1)
'pgararaph'
>>> scramble_factor(s, 2)
'prahagrap'
>>> scramble_factor(s, 5)
'pgpaarrah'
>>> scramble_factor(s, 10)
'arpahprag'
Of course functions can be combined or nested, but it is clear I think.
Edit:
It doesn't consider distance, but the scramble function easily replaced just for swapping adjacent letters. Here is one:
def scramble(s):
if len(s)<=1:
return s
index = random.randint(0, len(s)-2)
return s[:index] + s[index + 1] + s[index] + s[index+2:]

You could do a for-loop that counts down to 0.
Convert the String into a Char-Array and use a RNG to choose 2 letters to swap.