Character repeating in a string

Question

can you please tell me how to get every character in a string repeated using the for loop in python?my progress is as far as :

def double(str):
    for i in range(len(str)):
        return i * 2

and this returns only the first letter of the string repeated

Answer 1

I believe you want to print each character of the input string twice, in order. The issue with your attempt is your use of return. You only want to return the final string, not just a single repetition of one character from inside the loop. So you want your return statement to be somehow outside the for-loop.

Since this sounds like a homework problem, try to figure out how to do that above before continuing below.

Still stuck?

Print each character in a string twice, in order:

def double(str):
    outstr = ''
    for character in str:
        outstr = outstr + character + character
    return outstr

Without using a for-loop:

def double(str):
    return ''.join([c+c for c in str])

Answer 2

General variation, which returns string, repeating each character in the original string n times:

def multichar(text, n):
    return ''.join([x * n for x in text])

Explanation:

''.join(...) - glues everything in (...) together into one piece without spaces, i.e. ''.join('a', 'b', 'c') will return 'abc'.

' '.join('a', 'b', 'c') will return 'a b c'.

'-'.join('a', 'b', 'c') will return 'a-b-c'.

...you get the idea :)

[x * n ...] - repeats x n times, i.e. 'a' * 3 gives 'aaa'.

[... for x in text] - normal for loop - goes over every element in text.

Plain English for what the last line of the code does:

Glue without spaces every element in the list, generated by repeating x n times for every x in text.

Example:

>>> multichar('Hello', 2)

will return:

>>> 'HHeelllloo'

Answer 3

given a string, the below code repeats every original character in the string twice with the help of functions and while loop. res is a list that stores the doubled characters of the string. " ".join() is called to connect the list. the number of times that the original character is repeated can be changed. here's the code snippet.

def paper_doll(text):
j = len(text)  
i=0
res=[]
while i<j :

    res.append(text[i]*2)
    i = i+1
result ="".join(res)
print(result)

paper_doll('paperdoll')

OUTPUT :

ppaappeerrddoollll

open to any kind of feedback and suggestions.

Answer 4

With minimal modification to existing code:

(range(len)) would iterate over indices, not actual chars, and yield instead of return makes it a generator thus allowing to return all values)

def double(str):
    for i in str:
        yield i * 2

Use it as so:

str = 'This is a test'
''.join(double(str))

Answer 5

str = input('Enter string: ')
char = " "
for i in char:
    char = char + i + i
print(char)

Answer 6

def time_3(letter):
    a = []
    for i in range(0,len(letter)):
        a.append(letter[i]*3)
    return ''.join(a)
# call the function
print(time_3('HELLO'))

Output:

HHHEEELLLLLLOOO