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Conditionals
The if and else statements can perform simple tests. For example:
# Compute the maximum (z) of a and b
if a < b:
z = b
else:
z = a
The bodies of the if and else clauses are denoted by indentation. The else clause is optional.
To create an empty clause, use the pass statement as follows:
if a < b:
pass # Do nothing
else:
z = a
You can form Boolean expressions by using the or, and, and not keywords:
if b >= a and b <= c:
print "b is between a and c"
if not (b < a or b > c):
print "b is still between a and c"
To handle multiple-test cases, use the elif statement, like this:
if a == '+':
op = PLUS
elif a == '-':
op = MINUS
elif a == '*':
op = MULTIPLY
else:
raise RuntimeError, "Unknown operator"