Python

Use of modulesTwo types of reference modulesForm one: Import module_nameForm two: From Module1 import Module11 (Module11 is a submodule of module)Example: referencing the exact Division moduleImportThe math module in Python needs to be used for

------------------------------Thread---------------------------#线程应用的第一种方式: The thread module is the lower-level module#import Thread: Referenced module#thread. Start_new_thread (Defname, ()): Thread creation#thread. Exit_thread (): End of

str= ' python String function 'Generate string variable str= ' python string function 'String length acquisition: Len (str)Example: print '%s length=%d '% (Str,len (str))Letter HandlingAll caps: Str.upper ()All lowercase: str.lower ()Case swap:

I. Interpreter declaration　　1. How to declareLinux#!/usr/bin/pythonWindowns#!c:/python27/python.exePut it on the first line　　2. RoleTell the computer to use the/usr/bin Program (tool) Python, the interpreter, to interpret/run the Python

followed by the last content.Let's start with the Split () method: It slices the string by specifying a delimiter, and if the parameter num has a specified value, it separates only the NUM substring (a list that splits a string into a number of

BS4 does not have this good, bs4 tree is too complexlxml is good.Very good locationDetailed explanations are in the comments.1 #!/usr/bin/python3.42 #-*-coding:utf-8-*-3 4 fromlxmlImportetree5 Importurllib.request6 7 #the HTML of the destination

          44, class:                     General forms of class definitions:                           1, simple form: instanced objects are not self- Data attributes that are unique to your own. >>> class Fistclass ():...     data1 = ' Hello World '

This week we're going to learn about face-to-object programming, first look at the introduction of object-orientedIntroduction to Object-oriented related knowledge class: Used to describe a collection of objects that have the same properties and

1.urllibUrllib is part of the Python standard library and contains a urllib.request,urllib.error,urllib.parse,urlli.robotparser of four sub-modules.(1) Urllib.request usage1) Urlopen function: Used to open a URL (urlopen returns a class file object

Use Python to read the first line (the first row) and the last line (the final row) of the file (for large files and two small files). The script draws on the previous two processing ideas (in the script below to illustrate the source of references),

unicode/unicodebig/UTF8 on Python is not resolved by default in the window System ASCLL corresponds to the Gbkunicode|unicodebigendian Correspondence utf-16UTF-8 corresponds to Utf-8The representation of a string inside Python is Unicode encoding.

The properties of the dictionary key:(1) The same key is not allowed to appear two times: when created, if the same key is assigned two times, the latter value overrides the previous(2) The key must be immutable, so it can be used as a number, a

cannot be copied directly with =:ImportCopya= [1, 2, 3, 4, ['a','b']]#Original Objectb= A#assignment, a reference to a passing objectc = Copy.copy (a)#object Copy, shallow copyD = Copy.deepcopy (a)#object Copy, deep copyA.append (5)#Modify Object AA[

Posted in Http://liamchzh.0fees.net/?p=234&i=1An accidental opportunity to find the list in Python very interesting.Look at a piece of code first[PY]Array = [0, 0, 0]Matrix = [Array*3]Print matrix# # [[0,0,0,0,0,0,0,0,0]][/py]This code does not

1 defGetDateTime (TIME_STR):2 " "3 Conversion Time4 :p Aram Time_str:5 : return:6 " "7 if notisinstance (time_str,unicode):8Time_str = Time_str.decode ('Utf-8')9 TenTime_now =Datetime.datetime.now () OneTime_return =Time_str A -

If condition statementPython considers any non-0 and non-null to be true,0 or NULL to FalseIf statement formatif Judging condition: Execute statement ... Else : EXECUTE statement ...InstanceCode Flag=Falsename='Luren'ifName =

Python list deduplication, python list The problem is to de-duplicate the news id in a list. After de-duplicating, ensure that the order remains unchanged. Intuitive method The simplest idea is:  Copy the Code as follows: Ids = [1, 2, 3, 4, 2, 3, 4,

Implementation Method of Python function periodical execution, python periodic This article describes how to implement Python functions periodically. We will share this with you for your reference. The details are as follows: The sched module of

Dynamic Web album python write simple folder picture browsing tool, I don't know if you have such an experience. If you view a gif image on a windows computer, IE is opened by default. What other inquiry items are displayed, Which is troublesome. To

How does python display an image in a terminal, Linux terminals are amazing and infinite, and many excellent software is born in the terminal. In contrast, the concept of Windows is different from that of Linux, so you know.Next, let's take a look