Python/ThreePartOperator
From ProgrammingExamples
Early versions of Python did not supply a "ternary operator", but it is sometimes very nice.
If you simply want a default value in case the initial value evaluates to False
you can use the or
operator which takes the leftmost operand that evaluates to True
or the right operand if neither evaluates True
. Like this:
def example(required, alist=None, anum=None, astring=''): my_list = alist or ['item'] my_num = anum or 0 # note that 0 evaluates False, but is still chosen here my_string = astring or 'string' print('required: "%s"\nlist: %s\nNumber: %s\nString: "%s"'%(required, my_list,my_num,my_string))
Since version 2.5, however, Python has an official ternary operator called a "conditional operator": x if C else y
evaluates C first, then either x or y.