Iterating each character in a string using Python Iterating each character in a string using Python python python

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


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

>>> for i, c in enumerate('test'):...     print i, c... 0 t1 e2 s3 t


Even easier:

for c in "test":    print c


matomo