Repeating an input - python

I'm new to Python and have been working through some tutorials to try to get to grips with different aspects of programming.
I'm stuck on an exercise that is most likely very simple however I am unable to find the solution.
How do I create a program that reads one line of input and prints out the same line two times?
For example if the input was Echo it would print:
Echo
Echo
Any help with this would be hugely appreciated. I think I'm making a simple logic error but don't yet have the skills in place to recognise what it is.

The other answers seem logical enough, but what if you wanted to print it let's say a 1000 times or a million times? Are you really going to be typing print(variable) a million types? Here is a faster way:
j=input("Enter anything.")
for i in range(2):
print(j)
Here, I can change the value of range to whatever I want, and J will be printed that many times.
What happens here, is that the variable i loops upwards (an increment) to the number 2, so to explain it to a beginner, i travels t=from number to number. Where I put print(j) for every number i loops through until it gets to 2, J will be printed.

It sounds like you've been doing the input and output in one go:
print(input())
That works for doing a single echo of the input, but makes it a bit harder to repeat the same thing twice. An easy workaround would be to save the inputted text to a variable, which you can print twice:
text = input()
print(text)
print(text)
If you needed to do the input and doubled output with a single statement, you could use string formatting to duplicate the text with a newline in the middle:
print("{0}\n{0}".format(input()))

way complex right?(:D)
inp = input("Input something would ya? ")
print(inp)
print(inp)

Related

Input a message inside a box

I need to create a box with parameters that prints any input the user puts in. I figured that the box should be the length of the string, but I'm stuck with empty code, because I don't know where to start.
It should look like this:
I agree with Daniel Goldfarb comments. Don't look for help without trying.
If you still couldn't get how to do that, then only read my remaining comment.
Just print :
str = string entered
len(str) = string length
+-(len(str) * '-')-+
| str |
+-(len(str) * '-')-+
So hopefully you can learn, don't want to just write the code for you. Basically break it into steps. First you need to accept user input. If you don't know how to do that, try googling, "python accept user input from stdin" or here is one of the results from that search: https://www.pythonforbeginners.com/basics/getting-user-input-from-the-keyboard
Then, as you mentioned, you need the length of the string that was input. You can get that with the len function. Then do the math: It looks like you want "|" and two spaces on each side of the string, giving the length plus 6 ("| " on either side). This new length is what you should make the "+---+" strings. Use the print() function to print out each line. I really don't want to say much more than that because you should exercise your brain to figure it out. If you have a question on how to generate "+---+" of the appropriate length (appropriate number of "-" characters) you can use string concatenation and a loop, or just use the python string constructor (hint: google "construct python string of len repeat characters"). HTH.
One more thing, after looking at your code, in addition to my comment about printing the string itself within the box, I see some minor logic errors in your code (for example, why are you subtracting 2 from the width). THE POINT i want to me here is, if you ware going to break this into multiple small functions (a bit overkill here, but definitely a good idea if you are just learning as it teaches you an important skill) then YOU SHOULD TEST EACH FUNCTION individually to make sure it does what you think and expect it to do. I think you will see your logic errors that way.
Here is the solution, but I recommend to try it out by yourself, breakdown the problem into smaller pieces and start from there.
def format(word):
#It declares all the necessary variables
borders =[]
result = []
# First part of the result--> it gives the two spaces and the "wall"
result.append("| ")
# Second part of the result (the word)
for letter in word:
result.append(letter)
# Third part of the result--> Ends the format
result.append(" |")
#Transforms the list to a string
result = "".join(result)
borders.append("+")
borders.append("--"+"-"*len(word)+"--")
borders.append("+")
borders="".join(borders)
print(borders)
print(result)
print(borders)
sentence = input("Enter a word: ")
format(sentence)
I'm new to Python, and I've found this solution. Maybe is not the best solution, but it works!
test = input()
print("+-", end='')
for i in test:
print("-", end='')
print("-+")
print("| " + test + " |")
print("+-", end='')
for i in test:
print("-", end='')
print("-+")

how to start printing from an alphabet while i'm getting a few new lines in the start

I have to print something by taking input from a file. The first few lines are empty. Therefore the output is turning out to be empty. It's like someone has pressed enter key 10 times before writing anything.
I want to ignore those inputs and consider only those which are not empty. What should I do?
By checking if there is anything apart from a newline character ("\n")is present in a line, your problem can be solved
fileObj=open(Filename)
for row in fileObj:
if len(row.replace("\n",""))>0:
print (row)
#Do your operations
If you can edit your question to add material, that would be helpful, but here’s a few pointers for now.
Assuming you’re taking the file in as a string (let’s call it "f"), you can loop over empty lines with a while loop:
charN = 0
while f[charN] == “\n”:
f = f[1:]
This allows you to chop off only the initial returns while keeping any line breaks later on in the file.
Note that, depending on the system this was written in, the enters may be stored as “\r\n”, in which case you could easily alter this for loop to remove those characters too. Good luck!

Running my python code in Gitbash

I am a total newbie in programming so I was hoping anyone could help me. I am trying to write program in python that, given an integer n, returns me the corresponding term in the sylvester sequence. My code is the following:
x= input("Enter the dimension: ")
def sylvester_term(n):
""" Returns the maximum number of we will consider in a wps of dimension n
>>> sylvester_term(2)
7
>>> sylvester_term(3)
43
"""
if n == 0:
return 2
return sylvester_term(n-1)*(sylvester_term(n-1)-1)+1
Now, my questions are the following, when trying to run this in GitBash, I am asked to input the n but then the answer is not showing up, do you know what I could do to receive the answer back? I plan to continue the code a bit more, for calculating some other data I need, however, I am not sure if it is possible for me to, after coding a certain piece, to test the code and if so, how could I do it?
You will need to add:
print(sylvester_term((int(x)))
to the end of your program to print the answer.
You will need to cast to int because the Python Input() function stores a string in the variable. So if you input 5 it will return "5"
This does not handle exceptions, e.g if the user inputs a letter, so you should put it in a try and except statement.
Here's an example of how I'd handle it. You can use sys.argv to get the arguments passed via the command line. The first argument is always the path to the python interpreter, so you're interested in the second argument, you can get it like so:
sys.argv[1]
Once that is done, you can simply invoke your function like so
print(sylvester_term(int(sys.argv[1]))

Spell check program in python

Exercise problem: "given a word list and a text file, spell check the
contents of the text file and print all (unique) words which aren't
found in the word list."
I didn't get solutions to the problem so can somebody tell me how I went and what the correct answer should be?:
As a disclaimer none of this parses in my python console...
My attempt:
a=list[....,.....,....,whatever goes here,...]
data = open(C:\Documents and Settings\bhaa\Desktop\blablabla.txt).read()
#I'm aware that something is wrong here since I get an error when I use it.....when I just write blablabla.txt it says that it can't find the thing. Is this function only gonna work if I'm working off the online IVLE program where all those files are automatically linked to the console or how would I do things from python without logging into the online IVLE?
for words in data:
for words not in a
print words
wrong = words not in a
right = words in a
print="wrong spelling:" + "properly splled words:" + right
oh yeh...I'm very sure I've indented everything correctly but I don't know how to format my question here so that it doesn't come out as a block like it has. sorry.
What do you think?
There are many things wrong with this code - I'm going to mark some of them below, but I strongly recommend that you read up on Python control flow constructs, comparison operators, and built-in data types.
a=list[....,.....,....,whatever goes here,...]
data = open(C:\Documents and Settings\bhaa\Desktop\blablabla.txt).read()
# The filename needs to be a string value - put "C:\..." in quotes!
for words in data:
# data is a string - iterating over it will give you one letter
# per iteration, not one word
for words not in a
# aside from syntax (remember the colons!), remember what for means - it
# executes its body once for every item in a collection. "not in a" is not a
# collection of any kind!
print words
wrong = words not in a
# this does not say what you think it says - "not in" is an operator which
# takes an arbitrary value on the left, and some collection on the right,
# and returns a single boolean value
right = words in a
# same as the previous line
print="wrong spelling:" + "properly splled words:" + right
I don't know what you are trying to iterate over, but why don't you just first iterate over your words (which are in the variable a I guess?) and then for every word in a you iterate over the wordlist and check whether or not that word is in the wordslist.
I won't paste code since it seems like homework to me (if so, please add the homework tag).
Btw the first argument to open() should be a string.
It's simple really. Turn both lists into sets then take the difference. Should take like 10 lines of code. You just have to figure out the syntax on your own ;) You aren't going to learn anything by having us write it for you.

print statement in for loop only executes once

I am teaching myself python. I was thinking of small programs, and came up with an idea to do a keno number generator. For any who don't know, you can pick 4-12 numbers, ranged 1-80, to match. So the first is part asks how many numbers, the second generates them. I came up with
x = raw_input('How many numbers do you want to play?')
for i in x:
random.randrange(1,81)
print i
Which doesn't work, it prints x. So I am wondering the best way to do this. Make a random.randrange function? And how do i call it x times based on user input.
As always, thank you in advance for the help
This should do what you want:
x = raw_input('How many numbers do you want to play?')
for i in xrange(int(x)):
print random.randrange(1,81)
In Python indentation matters. It is the way it knows when you're in a specific block of code. So basically we use the xrange function to create a range to loop through (we call int on x because it expects an integer while raw_input returns a string). We then print the randrange return value inside the for block.

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