Python

Security, access to the database is mostly limited, so there is a direct problem is that often, on other machines (such as their own local), is not able to access the database, to daily use caused great inconvenience. So a few days ago to do a

name =  "My name is jiachen" #首字母大写print   (Name.capitalize ()) #统计字母出现次数print   ( Name.count (' a ')) #居中打印print   (Name.center (+, '-')) #字符串装换成bytes类型print   (Name.encode (' Utf-8 ')) # Judge with what end print  (name.endswith (' en '))

#列表生成式list1  = [i*2 for i in range (1,11)] #生成器, the corresponding data list =  is generated at the time of the call (x*2  for x in range (1,1000000)) #list. __next__ () #函数生成器def  fib (max):     n,a,b = 0,0,1    while n This article is from the

Project Structure Knowledge points Create a project, write a __init__ file Write setup.py and manifest.in files using the Setuptools module To create a release version of a source file Project Registration & Uploading to PyPI

Higher-order functions are called Higher-order function in English. What is a higher order function? We take the actual code as an example, step by step in-depth concept.Variables can point to functionsFor example, in Python's built-in function for

SOURCE http://www.educity.cn/wenda/354028.htmlPython path-related functionsOs.listdir (dirname): List directories and files under DirNameOS.GETCWD (): Get current working directoryOs.curdir: Returns the current directory ('. ')Os.chdir (dirname):

Python is a very popular language in the big Data world, with Python support built into the Linux terminal, and the CentOS Package management tool Yum is written by Python: There are several versions of the Python interpreter, officially

Python Programming basic data types None value Integral type Floating point Type Boolean typeTrue,false String Tuple tuples(), ordered, not variableCases:t = (1,)t = (1, ' Hello ', 1.0,true) Lists List[], ordered,

#设stime为字符串import timestime = "2011-09-28 10:00:00" #中间过程, it is generally necessary to convert a string into an array of time time.strptime (stime, '%y-%m-%d%h:%m:%s ') >>time.struct_time (tm_year=2011, tm_mon=9, tm_mday=27, tm_hour=10, tm_min=50,

Def partition (a, i, j):     k = -1    while  True:        while k *  (A[i] - a[j])  >= 0:            if i ==  j:                  return i            j += k         a[i], a[j] = a[j], a[i]         i, j, k = j, i - k, -kdef qsort (a, i ,  j):     if 

Python simulates browser login with Requests.session object cnblogsRequest. Session-to-row can be used to persist cookies across requests and is very handy for simulating logins.Cnblogs Login Page Analysis:Login Page

1. Probing Web Service quality methods:Python version 3.5.2,pycurl version: pycurl-7.43.0.win-amd64-py3.5#-*-coding:utf-8-*-import os, sysimport timeimport sysimport pycurlurl = "http://www.baidu.com" #探测的目标URLc = Pycurl. Curl () #创建一个Curl对象c.

One, over 71 start =12 while start:3 if start!=7: 4 Print (start) 5 Start +=1View CodeWithin two or 100, and1 sum = 02 start = 13 while start:4 sum = Sum +start5 print(start,sum)6 start+=1View CodeThree, 100 inside odd

In learning the Python dictionary operation Method, feel SetDefault () method, more difficult to understand than the dictionary of the other basic methods of understanding more students, so think to summarize the following, this article mainly

This article mainly introduces in-depth analysis of Python timing killing process related data, the need for friends can refer to the following Before writing a Python script to crawl new posts with SELENIUM+PHANTOMJS, in the process of looping the

The so-called recursion is actually the function itself that calls the function until a layer exits after the specified condition is met, for example Once there was a mountain, there is a temple in the mountain, there is an old monk in the temple,

Closed Package In Python, a function is also an object. Therefore, when defining a function, we can then nest the definition of a function and return the nested function, for example: From math import Powdef make_pow (n): def inner_func (x):

This article is about Python's regular expression. Nonsense not much to say, first start the simplest: '. ': You can match any single character except the line break (that is, a point). ' * ' can match the preceding subexpression 0 or more times

Use Python to obtain nickname Based on Sina Weibo UID-simple crawlers and pythonuid 1 from bs4 import BeautifulSoup 2 import requests 3 from random import choice 4 import csv 5 6 headers1 = {'user-agent ': 'spider '} 7 headers2 = {'user-agent':

Python Day 2 -- operator, python Operator I. Operators 1. Arithmetic Operation: 　 A divided by B a divided by c for division. Number after the decimal point A // B is used for floor division. Only go to the integer, and remove the number after the