A issue of concatenating two strings with if…else statement

Question

I tried to concatenate two string like this

print 'AAA' if True else 'BBB' + 'CCC' if True else 'DDD'

In terminal, it just print like this 'AAA' but not 'AAACCC'. Why? Is there any other alternative way?

Answer 1

+ has a higher operator precedence than a conditional expression.

As a result, your expression is grouped like this:

('AAA') if (True) else (('BBB' + 'CCC') if (True) else ('DDD'))

You need to use parentheses to override the precedence:

print ('AAA' if True else 'BBB') + ('CCC' if True else 'DDD')

Demo:

>>> print 'AAA' if True else 'BBB' + 'CCC' if True else 'DDD'
AAA
>>> print 'AAA' if False else 'BBB' + 'CCC' if True else 'DDD'
BBBCCC
>>> print ('AAA' if True else 'BBB') + ('CCC' if True else 'DDD')
AAACCC