Example for syntax highlight with Pygments

Translate this document to HTML with a pygments enhanced frontend:

+rst2html-pygments --stylesheet=pygments-default.css
+

or to LaTeX with:

+rst2latex-pygments --stylesheet=pygments-default.sty
+

to gain syntax highlight in the output.

Convert between text <-> code source formats with:

+pylit --code-block-marker='.. code-block:: python'
+

Run the doctests with:

+pylit --doctest for-else-test.py
+

for-else-test

Test the flow in a for loop with else statement.

First define a simple for loop.

def loop1(iterable):
+    """simple for loop with `else` statement"""
+    for i in iterable:
+        print i
+    else:
+        print "iterable empty"
+    print "Ende"
+

Now test it:

The first test runs as I expect: iterator empty -> else clause applies:

>>> execfile('for-else-test.py')
+>>> loop1(range(0))
+iterable empty
+Ende
+

However, the else clause even runs if the iterator is not empty in the first +place but after it is "spent":

>>> loop1(range(3))
+0
+1
+2
+iterable empty
+Ende
+

It seems like the else clause can only be prevented, if we break out of +the loop. Let's try

def loop2(iterable):
+    """for loop with `break` and `else` statement"""
+    for i in iterable:
+        print i
+        break
+    else:
+        print "iterable empty"
+    print "Ende"
+

And indeed, the else clause is skipped after breaking out of the loop:

>>> loop2(range(3))
+0
+Ende
+

The empty iterator runs as expected:

>>> loop2(range(0))
+iterable empty
+Ende
+