Syntax and case of the IF condition statement for Python

1. Conditional statements

Indent with 4 spaces

If condition:

#条件成功,

Else

#条件不成功

If condition: {

#条件成功,

#条件成功,

}else{

#条件不成功,

#条件不成功,

}

The IF syntax is this or is used: or with {}

2. If for a single condition

[[email protected] python]#python3.5 if.py>>>>franksuccess[[email protected] python]#python3.5 if.py>>>>aaaerror[[email protected] python]#Cat if.py#!/usr/bin/env python#_*_ Coding:utf8 _*_#when there is input, wait forever until the user enters a value, the input value will be assigned to N,n on behalf of the user input contentN1= Input ('>>>>')ifN1 = ='Frank':      Print("Success")Else:      Print("Error"when defining a variable assignment, use an equals sign=The character is enclosed in double quotation marks to use the 2 equals sign when the If comparison, the character resulting single quotation marks.3If  statement [[email protected] python]#python3.5 if.py First>>>Franksecond>>>Yesfrank Niubi First judgment [[email protected] python]#python3.5 if.py First>>>Franksecond>>>Nnnnfrank Error A second judgment [[email protected] python]#python3.5 if.py First>>>Oooerror third judgment [[email protected] python]#Cat if.py#!/usr/bin/env python#_*_ Coding:utf8 _*_#when there is input, wait forever until the user enters a value, the input value will be assigned to N,n on behalf of the user input contentN1= Input ('first>>>')ifN1 = ='Frank': N2= Input ('second>>>')    ifN2 = ="Yes":        Print('Frank Niubi The first judgment of')    Else:        Print("Frank Error A second judgment")Else:    Print("error A third judgment")

4, multiple conditions of the IF condition judgment of the syntax, pass represents nothing to execute, Python can not be left blank, or error

If condition 1:

Pass

Elif Condition 2:

Pass

Elif Condition 3:

Pass

Else

Pass

5, and and OR

[[email protected] python]#python3.5 if2.pyUser name>>>Frank Password>>>frank123 input correct [[email protected] python]#python3.5 if2.pyUser name>>>Frank Password>>>aaerroe[[email protected] python]#Cat if2.py#!/usr/bin/env python#_*_ Coding:utf8 _*_#when there is input, wait forever until the user enters a value, the input value will be assigned to N,n on behalf of the user input contentN1= Input ('User name >>>') N2= Input ('Password >>>')ifN1 = ="Frank"  andN2 = ="frank123":                               Print('Enter the correct')Else:        Print('Erroe')

Or is not tested, anyway is and is 2 satisfied to be true, or is a casual satisfaction is true

6.if Judging if the number is even

[[email protected] python]#Cat if3.py#!/usr/bin/env python#_*_ Coding:utf8 _*_#when there is input, wait forever until the user enters a value, the input value will be assigned to N,n on behalf of the user input contenta=0 whileA < 20: Temp= A% 2iftemp = =0:PrintaElse:                                        Passa= A + 1[[email protected] python]#python if3.py024681012141618

Syntax and case of the IF condition statement for Python