Is there a foreach function in python and is there a way to implement it if there isnt any

Question

When the situation for a 'foreach' arises  I've normally implemented in javascript, but I've always thought it would be convenient. This is a small example of a foreach function

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

The function just works on every element and doesn't yield or return anything, I think it should be a built-in function and should be faster when implementing with pure pytho

Answer 1

Every occurence of "foreach" I've seen (PHP, C#, ...) does basically the same as pythons "for" statement.

These are more or less equivalent:

// PHP:
foreach ($array as $val) {
    print($val);
}

// C#
foreach (String val in array) {
    console.writeline(val);
}

// Python
for val in array:
    print(val)

So, 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]