python - Conditions and cycle

• Conditional statements

　　python does not support the switch statement, a plurality of determination can only be achieved with elif, while at the same time to determine if a number of conditions, can be used or, expressed judge the success of both of these conditions have an established; use and, expressed only if two conditions are established under determine conditions before they succeed.

num=9
if num>=0 and num<=10:    #判断是否在0~10之间
    print 'hello'

num=10
if num<0 or num>10:
    print 'hello'
else
    print 'undefine'

num=8
if (num>=0 and num<=5) or (num>=10 and num<=15):
    print 'hello'
else:
    print 'undefine'

• cycle

　　python provides for and while loops, do not do ... while loop

Loop control statements

break statement	Terminates the loop during the execution of statement block, and jump out of the entire cycle
continue Statement	Terminates the current execution loop statement block, out of the cycle, the next cycle execution.
The pass statement	pass an empty statement, in order to maintain the integrity of the program structure.