Python

Python if __name__ = = ' __main__ ' What's hell is it?Python believes that all modules can be executed or importIf a module is imported by import, the caller of the module may just want to use part of the module's code instead of running it

1. First try to download from the official website, pip install Pillow, the results of the network is not, always can't connect or download the failure,C:\windows\system32>pip Install PillowCollecting PillowRetrying (Retry (total=4, Connect=none,

1, the numberThere are 4 types of numbers in Python-integers, long integers, floating-point numbers, and complex numbers2. StringA sequence of characters enclosed in single, double, or triple quotation marks, such as:' Char ' # single quote

mutable types and immutable types in Python:Before we talk about Python-depth copies, we should first understand the types of elements in Python: they are mainly classified as mutable types and immutable types.A mutable type is two of the types of

It is convenient to check the Python method with tab completion in peacetime. 1. The Mac platform is configured as follows: Mac is a Unix-like platform that needs to add a configuration to Bash_profile (default is no this

Security Code: Indifferent ChildeIn this article, we say Python's built-in object types and their operations.Python has a lot of built-in types, why should we use built-in types? Is Python programming as much as possible to use custom types or as

On the command line, switch to the directory where you want to package the program, or open the command line in the program directory and enter the following instructions directlyPyinstaller-f xxx.pyPyinstaller-f-w-i Manage.ico app.py-F: Packaged as

Python Crawler Advanced HTML parsing1. Find tags by attributes: Basically there are stylesheets on every website, there will be different CSS classes for different tags. The tags we see may be like this Through the tag class our program can simply

About the Python decorator, not the system introduction, just to say some questions1 First understand that variables act on very important2 next to understand closures1 def Logger (func): 2 def Inner (*args, * *Kwargs):3

1. JSON-formatted POST requestThe key part is shown in bold, mainly the encoding method of post data and the Content-type of the request header.#Coding=utf8ImportJSONImportgzipImportMsgpackImportUrllibImportUrllib2ImportTarfiledefrequest ():Try: URL=

#!/usr/bin/env python #-*-Coding:utf8-*- age = Int (input ("Enter your Ages")) if age : print ("You are an adult") else: print ("Input error, re-enter") ------------------------------- ---------------- name_list = ["Jin", "Tom", "

#!/usr/bin/env python #-*-Coding:utf8-*- age = $ for I in range (3): intput = int (input ("Guess my Ages:")) if Intput Old: print ("Input too large, please re-enter") elif intput = : Print ("Answer right, game out")

Crawl through the network1 when we visit the entire network, we will inevitably visit different sites, but different sites will have a completely different structure and content ...Now step-by-step build a script that accesses the entire networkI

A Third-party library is installed first using the requests module-constructed Downloader requestsPIP Install requests1 classstrongdownload (object):2 3 def __init__(self):4 #Get Agent IPList .5Self.iplist = ['Find your own

Three-time handshake of TCP in the socket to establish a connectionWe know that TCP establishes a connection for a "three-time handshake", which is the exchange of three groupings.The process is as Follows: The client sends a SYN J to the

When using mixed-specific parameters to match the model, Python will follow the following rules about Order:1, in the function call, the parameters must appear in this order: any positional parameter (value), any keyword argument (name = Value) and *

2016/12/30 _ Python, 20161230_python Today's main learning content: Python: 1. Use of dictionaries 1) how to create a dictionary Dicts = {"name": "juncx", "age": 17} Dicts = dict ("name: juncx", "age: 17 ") 2) dictionary operations Print (dicts

Enumerate usage Summary-Python 3, enumerate-pythonEnumerate () Description Enumerate () is a python built-in Function Enumerate indicates enumeration and enumeration in the dictionary. For an iterable/traversed object (such as a list or string),

Windows: Windows Flask Prerequisites: 1. python version installed (generally 2.X) 2. easy_install is installed.   When installing python, remember to configure the Python environment variables. For example, I directly add G: \ Python to the

String functions in Python3 are learned and summarized. This article mainly introduces the string function learning Summary In Python3. This article describes formatting methods, searching and replacement methods, and splitting and combination