Python short circuit means stoppage of execution of a boolean operation if the truth value of expression has been determined already. Python both and and or operators short-circuit.
These are the short-circuiting case Boolean operations, ordered by ascending priority:
| Operation | Result | Notes |
|---|---|---|
x or y | if x is true, then x, else y | This is a short-circuit operator, so it only evaluates the second argument if the first one is false. |
x and y | if x is false, then x, else y | This is a short-circuit operator, so it only evaluates the second argument if the first one is true. |
not x | if x is false, then True, else False | not has a lower priority than non-Boolean operators, so not a == b is interpreted as not (a == b), and a == not b is a syntax error. |
Python short circuit example
Simple example code.
# Short Circuit Logical AND
False and print('Hello False')
True and print('Hello True')
# Short Circuit Logical OR
a = 1 > 0
if a or (1 / 0 == 0):
print('ok')
else:
print('nok')
Output:
Short-Circuiting in all() and any()
# helper function
def check(i):
print("SC")
return i
print(all(check(i) for i in [1, 0, 1, 0, 3]))
print(any(check(i) for i in [0, 0, 1, 1, 3]))Do comment if you have any doubts or suggestions on this Python topic.
Note: IDE: PyCharm 2021.3.3 (Community Edition)
Windows 10
Python 3.10.1
All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.