foreach function in Python 3

Question

def foreach(fn,iterable):
    for x in iterable:
        fn(x)

they just do it on every element and didn't yield or return something,i think it should be a built-in function and should be more faster than writing it with pure Python, but I didn't found it on the list,or it just called another name?or I just miss some points here?

def fn(*args):
    for x in args:
       dosomething

but I thought foreach is still welcome base on the two facts:

1. In normal cases, people just don't care about the performance
2. Sometime the API didn't accept iterable object and you can't rewrite its source.

Answer 1

Yes, there is a "foreach" in python. It's called "for".

What you're describing is an "array map" function. This could be done with list comprehensions in python:

names = ['tom', 'john', 'simon']

namesCapitalized = [capitalize(n) for n in names]