coding = utf-8

一行代码实现1--100之和

print sum(range(1,101));

如何在一个函数内部修改全局变量

globalVar = "fjkdfgjkh"
print globalVar
def hanshu():
global globalVar
globalVar= "000000"
hanshu()
print globalVar

列出5个python标准库

import sys
import urllib
import urllib2
import math
import csv

字典如何删除键和合并两个字典

dic = {"name":"2","age":"100"}
dic2 = {"name2":"3","age2":"200"}
del dic["name"]
print dic
dic.update(dic2)
print dic

python实现列表去重的方法

arr = ["1","2","2","3"]
dic = {}
for key in arr:
dic[key] = 0;
print dic
arr2= []
for key in dic:
arr2.append(key)
print arr2

python2和python3的range（100）的区别

print "python2返回列表，python3返回迭代器，节约内存"

输入a,b,c,d4个整数，计算a+b-c*d的结果

a = raw_input("a=")
b = raw_input("b=")
c = raw_input("c=")
d = raw_input("d=")

如果是字母就转换成数字

if ord(a) <= ord('0') or ord(a) >= ord('9'):
a = ord(a)
if ord(b) <= ord('0') or ord(b) >= ord('9'):
b = ord(b)
if ord(c) <= ord('0') or ord(c) >= ord('9'):
c = ord(c)
if ord(d) <= ord('0') or ord(d) >= ord('9'):
d = ord(d)

统一用数字来计算

he = float(a)+float(b)-float(c)*float(d)
print "he="+str(he)