Liaoche Python excerpt 3

1, if Judging conditions can also be abbreviated X. As long as a non- x 0 value, a non-empty string, a non-empty list, etc., it is judged True , otherwise False .

2. This is because the input() returned data type is str str not directly compared to an integer and must first be str converted to an integer. Python provides a int() function to do this thing:

s = input (' Birth: ') birth = Int (s) if birth <:    print (' 00 ago ') Else:    print (' 00 ')

Or s> ' 2000 ' is also possible, requiring a consistent type to compare.

要是int()function to find a string is not a valid number when the error occurs, the program exits.

Liaoche Python excerpt 3