implicit if python

1x = a if b else 0
2

1Python does not have a trailing if statement.
2There are two kinds of if in Python:
3
41. if statement:
5
6  if condition: statement
7  if condition:
8      block
9      
102. if expression (introduced in Python 2.5)
11
12	expression_if_true if condition else expression_if_false
13
14And note, that both print a and b = a are statements. Only the a part is an expression. So if you write
15  print a if b else 0
16  
17it means
18	print (a if b else 0)
19  
20and similarly when you write
21	x = a if b else 0
22  
23it means
24	x = (a if b else 0)
25  
26Now what would it print/assign if there was no else clause? The print/assignment is still there.
27And note, that if you don't want it to be there, you can always write the regular if statement on a single line, though it's less readable and there is really no reason to avoid the two-line variant.