[Tutor] foreach loops

[Jordan Greenberg]

Christopher Spears wrote:
> Hmmm...Perl is probably a bad example.  My apologies. 
> I was thinking more along the lines of this:
> 
> A C++ for loop:
> 
> #include <iostream>
> 
> using std::cout;
> 
> int main() {
> 	
> 	for (int i = 0; i < 10; i++) {
> 		cout << i << "\n";
> 	}
> 	
> 	return 0; 
> }
> 
The same functionality can be provided using python for and the range()
function, like:

for i in range(0, 10):
	print i


Though because of the way python works you don't need to use this type
of loop anywhere near as often as in other languages. For example in
java (and c++, but my c++ is so rusty I'm not going embarrass myself
trying to write an example) you're constantly doing things like looping
over an array:

public void main(String[] args) {
	int[] foo;

	/* then later after foo has been initialized to whatever: */

	for (int i=0; i<foo.length; i++) {
		System.out.println(foo[i]);
	}
}

The equivalent code in python is much cleaner, after foo has been
initialized to whatever:

	for each in foo:
		print each


Hope this helps,
Jordan Greenberg