Python

From the more easily remembered is the built-in setL1 = [' B ', ' C ', ' d ', ' B ', ' C ', ' A ', ' a ']L2 = List (set (L1))Print L2There is also a speed difference that is said to be faster and not tested.L1 = [' B ', ' C ', ' d ', ' B ', ' C ', '

Then I'll take a look at the area. Learn about the XLRD module:1. What is the XLRD module?2. Why use the XLRD module?3. How do I use the XLRD module?1. What is the XLRD module? The Python operation Excel mainly uses the XLRD and XLWT the two

1.Beautiful is better than ugly.beauty is better than ugliness ( Python aims to write graceful code)2.Explicit is better than implicit.clarity is better than obscure (graceful code should be clear, naming specification, style similar)3. Simple is

Ide 　　Personal recommendation Pycharm: relatively easy to use, although no Chinese, but practice English is also good, after all, similar 　　Basic syntax Line and indent Python's most distinctive feature is the use

1 # !/usr/bin/python 2 # -*-coding:utf-8-*- 3 4 Print " Hello, World ";。The default encoding format in python2.x is ASCII format, the Chinese characters cannot be printed correctly when the encoding format is not modified, so the error occurs when

One: Login operation from Django.contrib.auth authenticate,login,logout #可以用来做登录验证 from django.contrib.auth.decorators login_required #装饰器 for verifying that a user is logged on1. Simple to use:def acc_login (request): Error_msg="'

ImportRePrintRe.search (R ' \d{4}-\d{2}-\d{2}',' xxxx1990-12-20xxxx '). Group (0)PrintRe.search (R ' \d{4}-\d{2}-\d{2}t\d{2}: \d{2}: \d{2}',' xxxx2005-06-04t18:37:11xxxx '). Group (0)PrintRe.search (R ' \d{4}-\d{2}-\d{2}t\d{2}: \d{2}: \d{2}. \d{3}','

The shelve module is a simple k,v module that persists memory data through a file and can persist any Python data that pickle can support.# pickle is encapsulated and can be dump multiple times# serializationImport shelvef = Shelve.open

Exception handlingError: There are two common mistakes in Python, the first of which is grammatical errors, such as the lack of a T in print, which is deadly and most unforgivable. The second is a logic error, such as res = 1/0, which is a logical

Exporting C + + classes (pure virtual functions and virtual functions)The general approach is to write a warpfor class , through the get_override method to detect whether the virtual function is overloaded, if the call overloaded function is

A regular expression is a technique that extracts a small string of strings that we are interested in in a text. In Python, regular expressions can be used in many places, such as flask, the Django framework to configure routing, crawlers, and so on.

There are many operators in Python, and today we're going to talk about what is the essential difference between the two operators of IS and = =.Before you distinguish between the IS and = = operators, the first thing to know is that the three basic

First, the system basic information Module 1.1 Get system Performance Information Module psutil1.1.1 get system performance InformationClick to view: https://www.cnblogs.com/hwlong/p/9079405.html1.1.2 System Process Management methodClick to view:

The following subjects come from the fourth edition of the Python Learning Manual, which is roughly sorted out in the direction1. First part: Getting Started withBefore introducing Python syntax, a broad description of Python's aspects, including

You can nest lists in a listThe elements in the list can be numbers, characters, booleans, lists, and so onYou can take values by index, slice. Nested values can be indexed multiple timesString conversion list List[str]. Internal use forList

Original link: https://legacy.python.org/dev/peps/pep-0008/Ref: 78954852Code lay-out LayoutIndentation IndentTabs or Spaces tab or spaceThe maximum length of the Maximum line lengthShould a line breaks before or after a binary operator should be

InchDetermines whether a single element is in a sequence, only the key is judged by the dictionaryPrint ("AB" in "ABCDEFG") print ("abc" in ["ABC", "AC"]) print ([1, 2] in [[1, 2], ' 3 "]) print (" abc "in {" ABC ": {"abc": 33})IsDetermine if the

The recent process of learning Python has found a pit when making a server model! Not many BBdata = input ()Eoferror:eof when reading a lineInput () How can there be errors, I also checked the interpreter, I found that I was in the "sub-process"

Pip install. \YAGMAIL-0.10.212-PY2.PY3-NONE-ANY.WHL---installation yagmailImport YagmailUsername = ' [email protected] 'passwd = ' xxxxxxxxxxxx ' #邮箱授权码 (need to be set up in the mailbox)Mail = Yagmail. SMTP (user=username,password=passwd,host= '

1. Basic ConceptsUnit test-Used to verify that there is no problem with some aspect of the functionTest Cases-a set of unit tests that verify the behavior of the function in all situations meets the requirementsFull coverage test Case-includes a