How would I replace the spaces in a string with underscores without using the replace function. I was told to also use a accumulation string with some type of loop
string = input("Enter a string")
i = 0
acc = ""
for char in string:
if char == " ":
acc = string + "_"
print(acc)
Try this,
string = input("Enter a string")
i = 0
acc = ""
newlist = [] #create a new list which will be the output
strlist = list(string) #create a list of each character in the input string
for char in strlist:
if char == " ":
newlist.append('_')
newlist.append(char)
acc = ''.join(newlist)
print(acc)
Your code should to be :
string = input("Enter a string")
i = 0
acc = ""
for char in string:
if char == " ":
acc += "_"
else:
acc += char
print(acc)
Try it if without replace.
string = input("Enter a string")
res = ''.join(["_" if i == " " else i for i in string])
print(res)
Another method:
string = input("Enter a string")
res = "_".join(string.split(" "))
print(res)
Your code isn't too far off. You can use an accumulation string like this:
string = input("Enter a string")
acc = ""
for char in string:
if char == " ":
char = "_"
acc += char
print(acc)
If you are allowed to use split, then
s = 'Your string with spaces'
s_ = ''
for word in s.split():
s_ += '_' + word
s_[1:] # 'Your_string_with_spaces'
Otherwise, instead of words, concatenate characters with '_' instead of ' ':
s_ = ''
for char in s:
if char == ' ':
s_ += '_'
else:
s_ += char
Related
Not allowed to use "Split(),Reverse(),Join() or regexes" or any other
helping inbuilt python function
input something like this:
" my name is scheven "
output like this:
"ym eman si nevehcs"
you need to consider removing the starting,inbetween,ending spaces aswell in the input
I have tried 2 tries, both failed i will share my try to solve this and maby an idea to improve it
First try:
def reverseString(someString):
#lenOfString = len(someString)-1
emptyList = []
for i in range(len(someString)):
emptyList.append(someString[i])
lenOfString = len(emptyList)-1
counter = 0
while counter < lenOfString:
if emptyList[counter] == " ":
counter+=1
if emptyList[lenOfString] == " ":
lenOfString-=1
else:
swappedChar = emptyList[counter]
emptyList[counter] = emptyList[lenOfString]
emptyList[lenOfString] = swappedChar
counter+=1
lenOfString-=1
str_contactantion = ""
#emptyList = emptyList[::-1]
#count_spaces_after_letter=0
for letter in emptyList:
if letter != " ":
str_contactantion+=letter
#str_contactantion+=" "
str_contactantion+=" "
return str_contactantion
second try:
def reverse(array, i, j):
emptyList = []
if (j == i ):
return ""
for k in range(i,j):
emptyList.append(array[k])
start = 0
end = len(emptyList) -1
if start > end: # ensure i <= j
start, end =end, start
while start < end:
emptyList[start], emptyList[end] = emptyList[end], emptyList[start]
start += 1
end -= 1
strconcat=""
for selement in emptyList:
strconcat+=selement
return strconcat
def reverseStr(someStr):
start=0
end=0
help=0
strconcat = ""
empty_list = []
for i in range(len(someStr)):
if(someStr[i] == " "):
continue
else:
start = i
j = start
while someStr[j] != " ":
j+=1
end = j
#if(reverse(someStr,start,end) != ""):
empty_list.append(reverse(someStr,start,end))
empty_list.append(" ")
for selement in empty_list:
strconcat += selement
i = end + 1
return strconcat
print(reverseStr(" my name is scheven "))
The following works without managing indices:
def reverseString(someString):
result = crnt = ""
for c in someString:
if c != " ":
crnt = c + crnt # build the reversed current token
elif crnt: # you only want to do anything for the first space of many
if result:
result += " " # append a space first
result += crnt # append the current token
crnt = "" # and reset it
if crnt:
result += " " + crnt
return result
reverseString(" my name is scheven ")
# 'ym eman si nevehcs'
Try this:
def reverseString(someString):
result = ""
word = ""
for i in (someString + " "):
if i == " ":
if word:
result = result + (result and " ") + word
word = ""
else:
word = i + word
return result
You can then call it like this:
reverseString(" my name is scheven ")
# Output: 'ym eman si nevehcs'
Try this:
string = " my name is scheven "
def reverseString(someString):
result = ''
curr_word = ''
for i in someString:
if i == ' ':
if curr_word:
if result:
result = f'{result} {curr_word}'
else:
result = f'{result}{curr_word}'
curr_word = ''
else:
curr_word = f'{i}{curr_word}'
return result
print(repr(reverseString(string)))
Output:
'ym eman si nevehcs'
Note: if you're allowed to use list.append method, I'd suggest using a collections.deque as it's more performant than appending to a list. But of course, in the end you'll need to join the list together, and you mentioned that you're not allowed to use str.join, so that certainly poses an issue.
I came across below mentioned scenario:
Input:-
parselTongue
Expected Output:-
parsel_tongue
My code:-
empty_string = ""
word = input()
if word.islower() == 1:
empty_string = empty_string + word
print(empty_string)
else:
for char in word:
char = str(char)
if char.isupper() == 1:
x = char
y = word.find(x)
print(char.replace(char, word[0:y] + "_" + char.lower() + word[y:]))
My output:-
parsel_tTongue
Please advice where i am going wrong as my output is coming as "parsel_tTongue" and not "parsel_tongue"
The more elegant solution would be just to implement the logic using comprehension.
word = input()
output= ''.join(c if not c.isupper() else f'_{c.lower()}' for c in word)
#output: 'parsel_tongue'
I believe that this approach could be better.
It prevents from situations where word contains not only letters but also special characters or numbers.
word = "camelCaseWord"
res = "" # sanke case word
# handle 1st upper character
if word[0].isupper():
word = word[0].lower() + word[1:]
for w in word:
# Only letter can be upper
if w.isupper():
res += "_" + w.lower()
else:
res += w
print(res)
>>> camel_case_word
if word = "camelCase3Wor& - > >>> camel_case3_wor&
no need for loop use regex
import re
name = 'parselTongue'
name = re.sub(r'(?<!^)(?=[A-Z])', '_', name).lower()
print(name) # camel_case_name
Adjust the slice on word
empty_string = ""
word = input()
if word.islower() == 1:
empty_string = empty_string + word
print(empty_string)
else:
for char in word:
char = str(char)
if char.isupper() == 1:
x = char
y = word.find(x)
print(char.replace(char, word[0:y] + "_" + char.lower()+ word[y+1:]))
prints the following for the input parselTongue
praselTongue
prasel_tongue
The best practice may be using regex:
fooBarBaz -> foo_bar_baz
re.sub(r'([A-Z])',lambda match:'_'+match.group(1).lower(),'fooBarBaz')
foo_bar_baz -> fooBarBaz
re.sub(r'_([a-z])',lambda match:match.group(1).upper(),'foo_bar_baz')
import re
camel_case = 'miaBau'
snake_case = re.sub(r'([A-Z])', r'_\1', camel_case).lower()
I have a problem when creating a function that's supposed to first return lowercase letters, "_" and "." and then uppercase letters, " " and "|" in that order. My version seems to return numbers and special characters like <># too which I don't want it to do, It's only supposed to read through the input string once and I don't know if that's achieved with my code.
My code is:
def split_iterative(n):
splitted_first = ""
splitted_second = ""
for i in n:
if i == i.lower() or i == "_" or i == ".":
splitted_first = splitted_first + i
elif i == i.upper() or i == " " or i == "|":
splitted_second = splitted_second + i
return splitted_first + splitted_second
if I do split_iterative("'lMiED)teD5E,_hLAe;Nm,0#Dli&Eg ,#4aI?rN#T§&e7#4E #<(S0A?<)NT8<0'")) it returns "'li)te5,_he;m,0#li&g ,#4a?r#§&e7#4 #<(0?<)8<0'MEDDELANDEINTESANT" which is incorrect as it should eliminate all those special characters and numbers. How do I fix this? It should return ('lite_hemligare', 'MEDDELANDE INTE SANT')
You could try this:
def f(input_string):
str1 = str2 = ""
for character in input_string:
if character.isalpha():
if character.islower():
str1 += character
else:
str2 += character
elif character in "_.":
str1 += character
elif character in " |":
str2 += character
return str1, str2
Output:
>>> input_string = "'lMiED)teD5E,_hLAe;Nm,0#Dli&Eg ,#4aI?rN#T§&e7#4E #<(S0A?<)NT8<0'"
>>>
>>> print f(input_string)
('lite_hemligare', 'MEDDELANDE INTE SANT')
>>>
This is because you are iterating through a string. The lowercase of the special characters is the same as the character. i.e.. '#'.lower() == '#'. hence it'll return '#' and all other special characters. you should explicitly check for alphabets using the isalpha() method on strings.
(i.isalpha() and i.lower() == i) or i == '_' or i == '.'
First, to make it return a list don't return the concatenated string but a list
Second, you are not checking or filtering out the characters, one way would be by checking if the character is a letter using isalpha() method
something like this:
def split_iterative(n):
splitted_first = ""
splitted_second = ""
for i in n:
if (i.isalpha() and i == i.lower()) or i == "_" or i == ".":
splitted_first = splitted_first + i
elif (i.isalpha() and i == i.upper()) or i == " " or i == "|":
splitted_second = splitted_second + i
#returns a list you can make it a variable if you need
return [splitted_first, splitted_second]
You can use ASCII values for the filtering of characters:
def split_iterative(n):
splitted_first = ""
splitted_second = ""
for i in n:
if ord(i) in range(97,122) or i == "_" or i == ".":
splitted_first = splitted_first + i
elif ord(i) in range(65,90) or i == " " or i == "|":
splitted_second = splitted_second + i
return (splitted_first , splitted_second)
You can make use of two lists while walking through characters of your text.
You can append lowercase, underscore, and stop characters to one list then uppercase, space and pipe characters to the other.
Finally return a tuple of each list joined as strings.
def splittext(txt):
slug, uppercase_letters = [], []
slug_symbols = {'_', '.'}
uppercase_symbols = {' ', '|'}
for letter in txt:
if letter.islower() or letter in slug_symbols:
slug.append(letter)
if letter.isupper() or letter in uppercase_symbols:
uppercase_letters.append(letter)
return ''.join(slug), ''.join(uppercase_letters)
txt="'lMiED)teD5E,_hLAe;Nm,0#Dli&Eg ,#4aI?rN#T§&e7#4E #<(S0A?<)NT8<0'"
assert splittext(txt) == ("lite_hemligare", "MEDDELANDE INTE SANT")
I want to remove extra spaces in a string using only for/while loops, and if statements; NO split/replace/join.
like this:
mystring = 'Here is some text I wrote '
while ' ' in mystring:
mystring = mystring.replace(' ', ' ')
print(mystring)
output:
Here is some text I wrote
Here's what I tried. Unfortunately, it doesn't quite work.
def cleanupstring(S):
lasti = ""
result = ""
for i in S:
if lasti == " " and i == " ":
i = ""
lasti = i
result += i
print(result)
cleanupstring("Hello my name is joe")
output:
Hello my name is joe
My attempt doesn't remove all the extra spaces.
Change your code to this:
for i in S:
if lasti == " " and i == " ":
i = ""
else:
lasti = i
result += i
print(result)
Check that the current character and the next one are spaces, and if not, add them to a clean string. There really is no need for an and in this case, since we are comparing to the same value
def cleanWhiteSpaces(str):
clean = ""
for i in range(len(str)):
if not str[i]==" "==str[i-1]:
clean += str[i]
return clean
Uses the end of result in place of lasti:
def cleanupstring(S):
result = S[0]
for i in S[1:]:
if not (result[-1] == " " and i == " "):
result += i
print(result)
cleanupstring("Hello my name is joe")
Just try this
t = "Hello my name is joe"
" ".join(t.split())
this will output
"Hello my name is joe"
I need a program that asks the user to enter any text and then display three strings, the first of which consists of all the vowels from the text, the second, of all consonants, and the third, of all other characters. I have it in a while loop right now, I was wondering how I can transfer that into a for-loop in Python.
text = input("Enter text: ")
# Loop counter
i = 0
# Accumulators
vows_string = ""
cons_string = ""
other_str = ""
while i < len(text):
char = text[i]
if char in "aioueAIOUE":
vows_string += char
elif char.isalpha():
cons_string += char
else:
other_str += char
i += 1
# Add pseudo-guillemets to make spaces "visible"
print(">>" + vows_string + "<<")
print(">>" + cons_string + "<<")
print(">>" + other_str + "<<")
Since strings are iterable, you can replace
while i < len(text):
char = text[i]
with
for char in text:
# no more need for 'i'
By the way, try if char.lower() in "aioue":
Now that the code is simple, let's make it potentially more efficient by using a set() for the vowels instead of a string:
# Vowels Set
vowels = set("aeiouAEIOU")
# Accumulators
vowels_string = ""
consonants_string = ""
other_string = ""
# User Input
text = input("Enter text: ")
# Process Text
for char in text:
if char.isalpha():
if char in vowels:
vowels_string += char
else:
consonants_string += char
else:
other_string += char
# Add pseudo-guillemets to make spaces "visible"
print("<<", vowels_string, ">>", sep="")
print("<<", consonants_string, ">>", sep="")
print("<<", other_string, ">>", sep="")