Python Learning Note 3-Process Control if, for, while

Process Control if

If statement

If expression:

Statement (s)

Else

Else statement:

If statement, Else statement

If expression:

Statement (s)

Else

Statement (s)

Elif statement:

If expression1:

Statement1 (s)

Elif expression2 (s):

Statements2 (s)

Else

Statement2 (s)

Note: Python uses indentation as a method of grouping its syntax, and it is recommended to use 4 spaces

A logical value (BOOL) contains two values:

True: Represents non-empty quantities (for example: string,tuple,list,set,dictonary) for all non-zero.

False: Represents 0,none, empty amount, etc., including empty tuples, empty lists, empty dictionaries.

[[Email protected] ~]# vim 1.py#!/usr/bin/pythonscore = int (Raw_input ("please  input you score ")) if  score >= 90:    print  ' A '     print  ' Very good ' elif score >= 80:     print  ' B '     print  ' good ' elif score >= 70:     print  ' C '     print  ' pass ' else : print  ' D fail ' print  ' End ' [[email protected] ~]# python 1.py please input you  score90avery goodend[[email protected] ~]# python 1.py please input  You score80bgoodend[[email protected] ~]# python 1.py please input you  score70cpassend[[email protected] ~]# python 1.py please input you  score10d failend

[[email protected] ~]# vim 2.py #!/usr/bin/pythonyn = raw_input ("Please input [yes/no]") yn = yn.lower () if yn = = ' y ' or yn = = ' Yes ': print "program is running" elif yn = = ' n ' or yn = = ' no ': print "program was exit" Else:print "please Inpu t [yes/no] "[[email protected] ~]# python 2.py * input [Yes/no]yesprogram is running[[email protected] ~]# python 2.py please input [Yes/no]noprogram is exit

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Python Learning Note 3-Process Control if, for, while