Python fragmentation knowledge (11): assert usage

Refer:

Http://www.cnblogs.com/herbert/archive/2013/01/12/2857233.html

The assert statement is also available in C or C ++. Short assertions. The following is a description from python help document:

Assert statements are a convenient way to insert debugging assertions into a program:

An assert statement is a convenient way to insert a debugging breakpoint to a program.

 

Format of the assert statement

assert expression

This statement is equivalent to the following sentence:

if __debug__:    if not expression: raise AssertionError

 

Assert can also be used for assertions of multiple expressions.

assert expression1, expression2

 

I wrote an example of assert usage for prime number determination.

def isPrime(n):    """This function return a number is a prime or not"""    assert n >= 2    from math import sqrt    for i in range(2, int(sqrt(n))+1):        if n % i == 0:            return False    return True

 

Assert is easy to use and can avoid unnecessary unknown errors.

The assert statement is also available in C or C ++. Short assertions. The following is a description from python help document:

Assert statements are a convenient way to insert debugging assertions into a program:

An assert statement is a convenient way to insert a debugging breakpoint to a program.

 

Format of the assert statement

assert expression

This statement is equivalent to the following sentence:

if __debug__:    if not expression: raise AssertionError

 

Assert can also be used for assertions of multiple expressions.

assert expression1, expression2

 

I wrote an example of assert usage for prime number determination.

def isPrime(n):    """This function return a number is a prime or not"""    assert n >= 2    from math import sqrt    for i in range(2, int(sqrt(n))+1):        if n % i == 0:            return False    return True

 

Assert is easy to use and can avoid unnecessary unknown errors.