What does assertion means ?

Question

Plz give the answer in simple word as you possible

Answer 1

Assertion means that you assume that a statement is true and if it isn't, an exception will be raised (=there will be an error). Example:

n = 5

assert n < 10 # this is true, so nothing will happen

assert n > 10 # this is false, so the program will show an error

It is almost the same as an if statement:

if n < 10:
# do nothing
pass

if n <= 10:
raise ValueError # raise an exception

Answer 2

assert is like an if, but where an if returning True will execute a block of code, an assert statement returning True will do nothing.

An if returning False will not execute a block of code, an assert returning False will throw an error.

assert True #code executes normally

assert False #AssertionError raised