python基础知识和经验总结-1

# coding=utf-8
import itertools
# list.reverse()
# 反向列表中元
def foo(lst,s):
    return [str(i)+s for i in lst]
data=[[4,5,4,46,4], [1, 2, 8, 9],
     [9, 4, 9, 11],
     [3,3],
     [5, 8, 11, 1],
     [5, 7, 10, 11],
     ]
t=0
#判断首尾相同提取拆分数组
# shouwei=[]

# for i in range(len(data)):
#   if data[i][0] == data[i][-1]:
#       print shouwei.append(data.pop(i));
#判断数组首尾相同
for i in range(len(data)):
    # print i
    temp=[]
    # shouwei=[]  
    # if data[i][0] != data[i][-1]:#判断是否是首尾相同
    for j in range(i+1,len(data)):
        if data[j][0] == data[i][-1] or data[j][-1] == data[i][-1]:#如果是邻边
            if data[i][-1] != data[j][0]:
                data[j].reverse()
            if data[i+1] in data: 
                data[j],data[i+1]=data[i+1],data[j]
print data

python爬虫使用urllib2方法

# coding:utf8
import urllib2
import cookielib

url = "http://www.baidu.com"
print '第一种方法'
response1=urllib2.urlopen(url)
print response1.getcode()
print len(response1.read())

print '第二种方法'
request=urllib2.Request(url)
request.add_header("user-agent","Mozilla/5.0")
response2=urllib2.urlopen(request)
print response2.getcode()
print len(response2.read())

print '第三种方法'
cj=cookielib.CookieJar()
opener=urllib2.build_opener(urllib2.HTTPCookieProcessor(cookiejar=cj))
urllib2.install_opener(opener)
request=urllib2.Request(url)
response3=urllib2.urlopen(request)
print response3.getcode()
print cj
print response3.read()

python取余数

x=4000
y=200
print x%y

python随机定时休息程序

# -*- coding: UTF-8 -*-
import random
import time
a=random.randint(1, 10) 
print "休息时间为：",a
time.sleep(a)

判断逗号是否在字符串内

site = 'Illinois;Winnebago County;Rockford, Machesney Park, Machesney Pk;61103'
if "," not in site:
   print('在里面')

读取文件删除不需要文件

# coding=utf-8
import os
# 定义函数用于，获得文件名

def get_filename(path, filetype):
    # import os
    name = []
    for root, dirs, files in os.walk(path):
        for dirs in files:
            if "," in dirs:
                os.remove(dirs)
    return name


if __name__ == '__main__':
    # 测试
    path = os.getcwd()
    print path
    filetype = '.txt'
    # data=open_allfile(path,filetype)
    name = get_filename(path, filetype)
    # print name

解一元多次方程

# coding=utf-8
a=[[-1,1], [1,0]]
a=np.array(a)#转成数组
b=[48,-32]
b=np.array(b)
c=np.linalg.solve(a,b)
print "美国第一夫人比法国第一夫人小：",c[1],"岁"

Python把带有中括号的字符串直接转为列表
可以把list,tuple,dict和string相互转化。

字符串转换成列表
>>>a = "[[1,2], [3,4], [5,6], [7,8], [9,0]]"
>>>type(a)

>>> b = eval(a)
>>> print b
[[1, 2], [3, 4], [5, 6], [7, 8], [9, 0]]
>>> type(b)

字符串转换成字典
>>> a = "{1: 'a', 2: 'b'}"
>>> type(a)

>>> b = eval(a)
>>> print b
{1: 'a', 2: 'b'}
>>> type(b)

字符串转换成元组
>>> a = "([1,2], [3,4], [5,6], [7,8], (9,0))"
>>> type(a)

>>> b = eval(a)
>>> print b
([1, 2], [3, 4], [5, 6], [7, 8], (9, 0))
>>> type(b)