5-python Learning--Conditional statements

5-python Learning--Conditional statements

• 5-python Learning--Conditional statements
  • Conditional statement if Else form
  • If else conditional statement description
    • Test it.

Programming languages are usually made up of so many parts.

1. Variable
2. Conditional branching statements
3. Looping statements
4. Function

Here is the conditional branching statement.

Python's conditional statements and shell scripts are very similar, that is if else if else , in this form, which else if can be abbreviated as elif .

Conditional statement if Else form

if <条件判断1>:    <执行1>elif <条件判断2>:    <执行2>elif <条件判断3>:    <执行3>else:    <执行4>

If else conditional statement description

ifThe following is the judging condition, for the condition, can be made similar to the C language implicit conversion to true or false . Non-0 value, non-empty string, non-empty list, etc., judged as True , otherwise False .

Test it.

#! /usr/bin/python3.4 if 100:    print("100 --> true")true = ""if true:    print("true")else:    print("true在这里是一个空的值")    true = 100if true:    print(true)

[email protected]:~$ python3 test.py 100 --> truetrue在这里是一个空的值100

5-python Learning--Conditional statements