Python - One line if-elif-else statement

Try:

print {1: 'one', 2: 'two'}.get(a, 'none')

The "ternary" operator in Python is an expression of the form

X if Y else Z

where X and Z are values and Y is a boolean expression. Try the following:

print "one" if a==1 else "two" if a==2 else "none"

Here, the value of the expression "two" if a==2 else "none" is the value returned by the first when a==1 is false. (It's parsed as "one" if a == 1 else ( "two" if a==2 else "none").) It returns one of "one", "two", or "none", which is then passed as the sole argument for the print statement.