Python conditional judgment

1        Conditional Judgment

[email protected] python]# cat age.py

#!/usr/bin/python

#-*-Coding:utf-8-*-

Age=20

If Age >=18:

print (' your age : ', Ages)-- Two indented lines are considered to be a block of statements

Print (' adult ')

Else

print (' your age : ', ages)

Print (' teenager ')

if the grammatical structure

If < Conditional Judgment 1>:

< Execution 1>

Elif < Conditional Judgment 2>:

< Execution 2>

Elif < Conditional Judgment 3>:

< Execution 3>

Else

< Execution 4>

There is no end to the fi in the shell , which indicates the end of the if judgment.

If statement execution has a characteristic, it is judging from the top, if in a certain judgment is True, the judgment corresponding to the execution of the statement, will ignore the remaining elif and Else

If x:

Print (' True ')

just x Non- 0 value, non-empty string, nonempty List and so on, it is judged True, otherwise False.

if interactively passing in parameters in judgment

[email protected] python]# cat birth.py

#!/usr/bin/python

#-*-Coding:utf-8-*-

Birth=input (' Please input your birthdayyear: ')

Birth=int (birth)

If Birth > 2000:

Print (' you are after xx ')

Else

Print (' you are pre -xx ')

[email protected] python]# python birth.py

Please input your birthday year:2015

you are after xx

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Python conditional judgment