python 实例二

# if elif else语句
score = input("score:")
if(score >= 90) and (score <= 100):
    print "A"
elif(score >= 80) and (score < 90):
    print "B"
elif(score >= 60) and (score < 80):
    print "C"
else:
    print "D"

x = 1; y = 2

operator = "+"

def fun01():
      return x + y

def fun02():
      return x - y

def fun03():
      return x * y

def fun04():
      return x / y

def fun05():
      print 'error'

result = {
    "+" : fun01(),
    "-" : fun02(),
    "*" : fun03(),
    "/" : fun04(),
        "" : fun05()
}

print result.get(operator)

#!/usr/bin/python
# -*- coding: UTF-8 -*-
x = 0
while x < 50:
    x += 1
    print '第 %d 次循环.' % x