if语句的简单使用

#!/usr/bin/python
#-*- coding:utf8 -*-

from __future__ import division

#简单的讲解if的使用 elif  switch的使用
def cmp(a, b):
    if a > b:
        print "a is bigger than b"
    elif a == b:
        print "a is eual to b"
    else:
        print "a is smaller than b"


#a = input("please enter a num: ")
#b = input("please enter other num: ")
#cmp(a,b)

#现在来介绍raw_input的使用
num = raw_input("please enter a num: ")
num = int(num)
print "the num is: ", num

string = raw_input("please enter a string: ");
print "the string is: ",string

#现在来演示elif的使用
score = input("enter the score: ")
if(score >= 90) and (score<=100):
    print "A"
elif(score >= 80) and (score <= 90):
    print "B"
elif(score >= 70) and (score <= 80):
    print "C"
elif(score >= 60) and (score <= 70):
    print "D"
else:
    print "E"




#现在来演示一下switch效果  注意 python中没有switch关键字额
#from __future__ import division
m = 1
n = 2
operator = "/"
result = {
    "+": m + n,
    "-": m - n,
    "*": m * n,
    "/": m / n
}

print "the result is: ",result.get(operator)

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