Python

For __name__ variables in Python, the value of the __name__ variable varies depending on how the Python file is called. If I had a Python script called hello_world.py, when I was aiming to run the file "Python hello_world.py" directly, the value for

Initializes the traditional way of the superclass, calling the __init__ () method of the superclass in an instance of the subclass.But the traditional approach has two problems, such as:Question 1:1 classMyBaseClass:2 def __init__(self,

The reduce () function is also a high-order function built into Python. The reduce () function receives a parameter similar to map (), a function f, a list, but behaves differently from map (), and reduce () the incoming function f must receive two

Python uses smtplib to send mail with the following code:vim/home/python/smtp_v2.py#!/usr/bin/env python#-*-encoding:utf-8-*-" "Welcome to the Python SMTP" "ImportSmtplib fromEmail.mime.textImportMimetext fromEmail.utilsImportformataddr

My Computer system is win7 64-bit installed Python-2.7.12.msi and Python-3.4.2.amd64.msi,======== Note:=========Both are configured with the environment variable path configure which version of the environment to select the appropriate configuration(

I'll start with the regular expression of Python's standard library. Regular expressions are a common tool in word processing and do not require additional system knowledge or experience. We will explain the system-related packages in the back.The

Import socketserverimport struct# DNS queryclass sindnsquery:def __init__ (self, data): i = 1 Self.name = "While true:d = data[i] if d = = 0:break; If d hh ', Data[i + 1:i + 5]) Self.len = i + 5 def getbytes (self): return self.

How do I get the largest or smallest list of n elements from a collection?The HEAPQ module has two functions: nlargest() and nsmallest() can solve this problem perfectly.Import Heapqin [+]: nums = [2, 5, 3, 4]in [in]: Heapq.nlargest (2, nums) out[[5]

Web login testing is a very common test! Manual test Everyone is familiar with it, how to do automated login test it! In this paper, the author uses python+selenium combined with UnitTest Unit test framework for a simple but relatively complete

1. A simple Web AccessUrllib is a standard Python library (meaning that you don't need to install any attachments to run the demo), including a way to request data over the network, process cookies, and even change metadata such as headers and user

Getting exception information is important for program debugging and can help you quickly locate locations with incorrect program statements. Here are some ways to get exception information in Python, where you get the exception (Exception)

1, recursive function: The simple point is that they call themselves, the recursive function must have a definite end condition, python default maximum recursion number is 999 times, the purpose is to protect the resources are not exhausted2, each

===================================== notation 1==========================import timedef Timer (func): Def deco (): Start_ Time = Time.time () func () Stop_time = Time.time () print (' The Func run time is%s '% (Stop_time-start _time return decodef

In Python2:Python-m Simplehttpserver 80 # Default port is 8000, directory is current directoryIf the current folder has a index.html file, the file is displayed by default, otherwise all files under the directory are displayed as a list of files.

Hello everyone, this section here is mainly about Urlerror and httperror, and some of the treatment of them. 1.URLError first explain the possible reasons for Urlerror: The network is not connected, that is, the computer is unable to connect to the

Python crawler introduction (from Wikipedia): A web crawler begins with a list of unified resource addresses (URLs) called seeds. When the crawler accesses these Uniform Resource locators, they will identify all hyperlinks on the page and

Import Osls = Os.linesepdef func1 (): filename = raw_input (' Enter file name: ') f = open (filename, ' W ') while True: Alline = Raw_input ("Enter a line ('. ' To quit):") if alline! = '. ': F.write ("%s%s"% (Alline,ls)) Else:break f.close ()

Class C (object): Def __call__ (self, *args, **kwargs): print "I ' m callable! Called with args:\n ", ARGSC = C () C (' A ', 1) single_code = Compile (" print ' hello,world! ' "," ', ' single ') exec (Single_code) Eval_code = Compile (' 100*3 ', ' ',

str1 = ' abced ' for I in range ( -1,-len (STR1),-1) + [None]: print str1[:i]s, t = ' abc ', ' Def ' print zip (S, t) for I, T in Enumerate (STR1): Print I, Tprint isinstance (' foo ', str) import Stringdef checkid (): Alphas = string.letters + '

2016/12/31 _ Python, 20161231_python What I learned today: Python: 1. with Statement (Supplement file operations yesterday) Files opened with will be automatically closed after the script ends, in case you forget to close the file connection in