Python

In general, to use a method of a class, you need to instantiate an object before calling the method.Instead of using @staticmethod or @classmethod, you can call it without instantiating it, directly from the class name. Method Name ().This

Py Core Module Method ********************os module: os.remove () Delete file Os.unlink () Delete file Os.rena Me () Rename file Os.listdir () lists all files under the specified directory Os.chdir () changes the current working directory

Built-in functions: Python provides a total of 68 built-in functions.One, scope-related(1)---------locals (): View local (2)-------globals ()---see all global variablesFor example:def func (): x=1 y=2print (Locals ()) #打印局部作用域的名字print

Function one of the set: relational operationThe function of the set two: to go heavyTo define a collection:The elements within the set must be unique;The elements in the set must be hash, and also the immutable type;The collection is unordered

In the previous article, we mentioned that Python's requests library can get all the contents of the network code, we have to acquire the nature of it must be processed, as we learn, a book, we can easily obtain, but it is to talk about philosophy

Python's logging module provides a common logging system that can be easily used by third-party modules or applications. This module provides different log levels and can record logs in different ways, such as files, HTTP get/post,smtp,socket, etc.,

# Zip () function and sorted () function # Zip () function: Merge two sequences, return a Zip object, cast to list or dictionary # sorted () function: Sort the sequence, return a sorted new list, the original data does not change # merge two lists,

2017-07-29 23:20:24Main technical route: requests+bs4+ formatted outputImportRequests fromBs4ImportBeautifulsoupurl='http://www.zuihaodaxue.com/zuihaodaxuepaiming2017.html'defgethtml (URL):#Open Web page is risky, need to use TRY-EXCEPT statement

With a python code like this, the C language developer knows that if a global variable is defined and a function variable with the same name is not defined within the function, then the assignment of that variable within the function is the

File read/writeWriting files is the most common IO operation. Python has built-in functions for reading and writing files, and the usage is compatible with C.Before reading and writing files, we must first understand that the ability to read and

tuples:python values that cannot be modified are called immutable, and immutable lists are called tuples.Such as:dimensions= (200,50) print (Dimensions[0]) print (dimensions[1])list: consists of a series of elements arranged in a particular

1. Write a function called a function right_justify that takes a string named ' s ' as a formal parameter and prints a sufficient number of leading spaces (leading space) to print the string so that the last letter of the string is in the 70th

Before writing a script, write a requirement analysisWill write more scripts later, will pay attention to this aspect of　　Prohibit HTTP requests? Requirements analysisCore Features:By modifying the Hosts file, users are forbidden to visit Baidu and

################################## #处理PDF和Word文档 ###################################‘‘‘PDF and Word documents are binary files, in addition to text,They also save a lot of fonts, colors, and layout information‘‘‘‘‘‘Extracting text from a PDF‘‘‘######

How to create a generator:For x in range (1,10000000), Sir into a list [1........9999999] if we only want the next few elements, we will find a lot of wasted space. So, if the list element can be calculated according to an algorithm, can we continue

Tag:load    Verification Code    utf-8   pytho   int     Default     data     memory    and    #-*-Coding:utf-8-*-import Random as Rd #验证码import Hashlib as HSL #MD5加密import pickle,json #pickle与json序列化 #print Rd.rand int (1,5) #print Help

today look at the variables and constants of Python: first, let's talk. The interpreter executes the Python process: Python3 C:\test.py 1. Start the Python interpreter (in memory) 2. Read the C:\test.py content from the hard disk into memory (this

single-threaded multi-timer tasks 1. Initial version: Train of thought: Timer, plainly is the delay to execute the specified program, the current self-reconfigurable python inside the timer is not too realistic, the ability to reach, so the delay

Learning notes TF028: simple convolution network and learning notes tf028 convolution Load the MNIST dataset. Create the default Interactive Session. The initialization function creates random noise to break the complete symmetry. Truncates Normal

Day5 module learning-hashlib module, day5 module-hashlib Hashlib Module Python hashlib provides common digest algorithms, such as MD5 and SHA1. What is a digest algorithm? Digest algorithms are also called hash algorithms and hash algorithms. It