Python

Match format Mode Description ^ Matches the beginning of a string $ Matches the end of the string. . Matches any character, except the newline character, when re. When the

The Python access site can be--urllib modules with standard modules (omitted here), and requests (installation-PIP install requests) modules, requests modules are encapsulated on a urllib basis, More powerful than Urllib module, easy to useImport

How to send an email 1. Open the POP3/SMTP service in the mailbox settings 2, some mailbox with password can not send, must obtain authorization code to be able.Import Smtplib,osFrom email.mime.text import MimetextFrom email.mime.multipart

Reprinted from Http://www.cnblogs.com/dalanjing/p/6978373.html, and made minor changes1. Open cmd installation PyQt5Pip Install Pyqt52,PYQT5 no longer provides tools such as QT Designer, so you need to install Pyqt5-toolsPip Install Pyqt5-tools3.

CSV (comma-separator values) comma-separated value, because it is a plain text file, any editor can be opened. CSV file operation in CSV and pandas two ways Raw CSV file contentsSupplier name,invoice number,part number,cost,purchase

Just use the while condition to determineServer-side#-*-Coding:utf-8-*-__author__ = "MuT6 sch01ar" Import socketserver = Socket.socket () server.bind ((' 127.0.0.1 ', 8080)) Server.listen () While true: conn,addr = Server.accept () and true:

Time Module There are many modules in Python that allow us to process time information. Time Module datetime Module Pytz Module Dateutil Module Here we highlight the first two types of Time Module

Python Crawler Basics1. Get Web page textGets the HTML text content of the Web page and returns it from the URLLIB2 package, based on the URL#Coding:utf-8Importrequests, JSON, time, RE, OS, sys, timeImportUrllib2#set to Utf-8 modeReload (SYS)

While loop#!/usr/bin/python#coding: Utf-8I=0Sum=0While iI+=1Sum+=iPrint sum first operation and then sum >> print "sum is:%d"%aSum is: 100 placeholder,%d= placeholder the next input is the number% Break interruptedWhile

anonymous functionsf = lambda x: x * xf(2) # x =2#4- 传入列表f = lambda x: x[2]print(f([1, 2, 3])) # x = [1,2,3]Map usingIncoming function bodydef f(x): return x*xr = map(f, [1, 2, 3, 4]) #函数作用在可迭代对象的每一项#[1, 4, 9, 16]- 另一个例子list(map([1, 2, 3, 4, 5, 6,

Base operatorHttp://www.cnblogs.com/alex3714/articles/5465198.htmlIdentity operator: is isn'tMember operator: in No in# #in to determine if an element exists in the queue that exists in the return tureA= "ABC"Print ("B" in a)num + = 1 equals num =

# -*- coding:utf-8 -*-# 7.18.1# 强口令检测# 写一个函数，使用正则表达式，确保传入的口令字符串是强口令# 长度不少于8个字符，同时包含大小写，至少有1个数字import repassd=input("Input your

Exception handlingException handling is the work of writing code must be completed, for the operation does not meet the expected, the program will always be abnormal situation, and the exception can be properly handled, is to ensure the stability of

CollectionSet (set) is an element dataset that does not need to be duplicated, the difference between the comparison list is first unnecessary, the index cannot be accessed, and the other feature is that there is no duplicate data.In project

Python's built-in document Test (doctest) module extracts the code directly from the comments and executes the test.Doctest strictly follows the input and output of the Python interactive command line to determine whether the test results are

Usually when we are processing data, some data types are not what we want to do?One, data type conversion: the type to convert (data) To convert num01 to integers: Int (num01) To convert num01 to floating point: float (NUM01) To

Chapter 3 python3, python3 Python includes the following functions:   Serial number Function Instance 1 List. append (obj)Add a new object at the end of the list   2 List. count (obj)Count the number of

PyQt5 open file dialog box QFileDialog instance code, pyqt5qfiledialog This article focuses on the code example of QFileDialog in the PyQt5 open file dialog box, as follows. Open a single fileQFileDialog.getOpenFileName() Open multiple

Python write log, python log There are many ways to write logs. I like this method and you can make a reference. Nothing to say, directly go to the code Import timedef write_log (value): now_time = time. time () # obtain the current date and time

Python fault tolerance, # Try: release T: else: # Why is it fault tolerance? Let's talk about the error first. The error mentioned here is not a bug left in the script because it is so careless or because it cannot be removed. The so-called "let