The Python Apprentice

if...elif...else

For multiple conditions you might be tempted to do something like this:

>>> if h > 50:...     print("Greater than 50")... else:...     if h < 20:...         print("Less than 20")...     else:...         print("Between 20 and 50")...Between 20 and 50

Whenever you find yourself with an else-block containing a nested if  statement, like this, you should consider using Python's elif keyword which is a combined else-if.

As the Zen of Python reminds us, Flat is better than nested:

>>> if h > 50:...     print("Greater than 50")... elif h < 20:...     print("Less than 20")... else:...      print("Between 20 and 50")...Between 20 and 50

This version is altogether easier to read.