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In C++, I can iterate over an std::string like this:
std::string str = "Hello World!"; for (int i = 0; i < str.length(); ++i) { std::cout << str[i] << std::endl; } How do I iterate over a string in Python?
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In Python, while operating with String, one can do multiple operations on it. Let's see how to iterate over characters of a string in Python. Example #4: Iteration over particular set of element.
In addition to string. ascii_lowercase you should also take a look at the ord and chr built-ins. ord('a') will give you the ascii value for 'a' and chr(ord('a')) will give you back the string 'a' . Using these you can increment and decrement through character codes and convert back and forth easily enough.
Individual characters in a string can be accessed by specifying the string name followed by a number in square brackets ( [] ). String indexing in Python is zero-based: the first character in the string has index 0 , the next has index 1 , and so on.
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
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