for loop in string python

Iterating each character in a string using Python

stackoverflow.com › questions › 538346 › iterating-each-character-in-a-string-using-python

As Johannes pointed out,

for c in "string":
    #do something with c

You can iterate pretty much anything in python using the for loop construct,

for example, open("file.txt") returns a file object (and opens the file), iterating over it iterates over lines in that file

with open(filename) as f:
    for line in f:
        # do something with line

If that seems like magic, well it kinda is, but the idea behind it is really simple.

There's a simple iterator protocol that can be applied to any kind of object to make the for loop work on it.

Simply implement an iterator that defines a next() method, and implement an __iter__ method on a class to make it iterable. (the __iter__ of course, should return an iterator object, that is, an object that defines next())

See official documentation

Answer from hasen on Stack Overflow

W3Schools

w3schools.com › python › gloss_python_for_string.asp

Python For Looping Through a String

Remove List Duplicates Reverse a String Add Two Numbers · Python Examples Python Compiler Python Exercises Python Quiz Python Challenges Python Server Python Syllabus Python Study Plan Python Interview Q&A Python Bootcamp Python Certificate Python Training ... Python For Loops Tutorial For For Break For Continue Looping Through a Range For Else Nested Loops For pass

Stack Overflow

stackoverflow.com › questions › 538346 › iterating-each-character-in-a-string-using-python

Iterating each character in a string using Python - Stack Overflow

Top answer

1 of 9

528

As Johannes pointed out,

for c in "string":
    #do something with c

You can iterate pretty much anything in python using the for loop construct,

for example, open("file.txt") returns a file object (and opens the file), iterating over it iterates over lines in that file

with open(filename) as f:
    for line in f:
        # do something with line

If that seems like magic, well it kinda is, but the idea behind it is really simple.

There's a simple iterator protocol that can be applied to any kind of object to make the for loop work on it.

Simply implement an iterator that defines a next() method, and implement an __iter__ method on a class to make it iterable. (the __iter__ of course, should return an iterator object, that is, an object that defines next())

See official documentation

2 of 9

349

If you need access to the index as you iterate through the string, use enumerate():

for index, character in enumerate('test'):
    print(index, character)
... 
0 t
1 e
2 s
3 t

Discussions

How do you make a program iterate over a string (which is already a variable) a set amount of times?

It is a bit hard to understand what you are asking. I think I am misundertanding. But here is how to iterate over a string X amount of times: iter_times = 5 my_str = "abcdefg" for i in range(iter_times): for char in my_str: print(char) If you just want the index of the character while you are iterating, you can use enumerate: my_str = "abcdefg" for i, char in enumerate(my_str): print(f"{char} has position {i} in my_str") More on reddit.com

r/learnpython

27

2

August 13, 2023

Python - Create string with for-loop - Stack Overflow

As a beginner to Python I got these tasks by the teacher to finish and I'm stuck on one of them. It's about finding the consonants in a word using a for-loop and then create a string with those More on stackoverflow.com

stackoverflow.com

Confused about for loops in Python. Please help me break down this code.

You're right, for loops will iterate over something. It turns out that a string is one of those things. It is after all a "string" of letters. So when a string acts as an iterator, you can think of it as being a list of single characters which you loop over one at a time. More on reddit.com

r/learnpython

26

December 19, 2024

Is there a way for a for loop to go through a string and also include spaces.

What does your code look like? Because if you’re iterating over the string, it shouldn’t differentiate between whitespace versus non-whitespace unless you tell it to. char_counts = {} txt = 'Hello? Hi\n' for char in txt: if char not in char_counts.keys(): char_counts[char] = 0 char_counts[char] += 1 More on reddit.com

r/learnpython

6

0

October 24, 2022

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