Python - Looping over a string

Question

How would loop the word that a user can input like the example below in python.

Enter a word: python (User can input any word)

p

py

pyt

pyth

pytho

python

(Then it loops the word inputted by the user)

Answer 1

Here are two more approaches!

Functional:

#!/usr/bin/env python3

in_word = input("Enter a word: ")

print("\n".join(\
    map(lambda x:in_word[:x], range(1,len(in_word)+1)) \
    ))  

Using recursion:

#!/usr/bin/env python3

in_word = input("Enter a word: ")

def print_word_recurse(word):
    if(not word): return
    print_word_recurse(word[:-1])
    print(word)


print_word_recurse(in_word)

Answer 2

There may be better ways to do this, but this is the simplest:

string = 'python'

for index in range(1, len(string)):
    print(string[:index])

Answer 3

Here's one way to do it, using Python 3 ⁽¹⁾:

>>> s = input('Enter string: ')
Enter string: python

>>> for i in range(1,len(s)+1):
...     print(s[:i])
...
p
py
pyt
pyth
pytho
python

It uses input() to prompt for, and get, a string from the user.

It then iterates the i variable from 1 to the length of the string (inclusive), each time printing out that many characters at the beginning of the string.

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Once you become more adept at Python's potential for terseness, you could replace the for loop with something like:

print(*[s[:i] for i in range(1,len(s)+1)],sep='\n')

or:

print("\n".join([s[:i] for i in range(1,len(s)+1)]))

but you may find that the readable solution is still the best :-)

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⁽¹⁾ If you're stuck on Python 2 for some reason, remember to use raw_input() and remove the parentheses from the print line.