Python - if/else Ternary Expression

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Introduction

Consider the following statement, which sets A to either Y or Z, based on the truth value of X: 

if X: 
    A = Y 
else: 
    A = Z

Python can write the above statement as follow: 

A = Y if X else Z

Demo

A = 't' if 'test' else 'f'      # For strings, nonempty means true 
print( A )
A = 't' if '' else 'f' 
print( A )# from   ww  w .j  a  va2  s. co m

Result

The following statement 

A = ((X and Y) or Z)

is equivalent to the ternary form: 

A = Y if X else Z

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