Python

Str.capitalize () # turns the first letter of a string into uppercase, and the other letters to lowercase. For 8-bit byte encoding needs to be based on the local environment 'hello'. Capitalize ()'hello' 'hello'. Capitalize ()'hello'# returns the

1. Small integer Object poolIntegers are used extensively in programs, and in order to optimize speed, Python uses a small integer pool of objects to avoid frequent application and destruction of memory space for integers.Python defines small

Python's urllib and urllib2 modules do all the work associated with requesting URLs, but they provide different functionality. The two most significant differences between them are as follows:Urllib2 can accept a request object and use this to set

When a variable is called, if the variable is not defined, then Python will make an error.The method to be solved is also very simple, which is to assign a null value to the variable beforehand.However, you can also call the system's built-in

Get file Dynamic Path commandImport Os,sysPrint (Os.path.abspath (__file__)) # find absolute path to filePrint (Os.path.dirname (Os.path.abspath (__file__))) # Locate the file parent directoryPrint (Os.path.dirname (Os.path.dirname (Os.path.abspath (

CycleThe representation of a For loop in the shell:1, the number of paragraph formFor i in {1..10};d o echo $i;d one2, detailed list (characters and the number of items not many)For File in file1 file2 file3 file4 file5;do echo $File;d One3, the

From the blog: Shanghai-leisurelyOriginal address: http://www.cnblogs.com/yoyoketang/tag/beautifulsoup4/ObjectiveThis article teaches you how to crawl the pictures on the site and save to the local computerFirst, the target site1. Open a landscape

From the blog: Shanghai-leisurelyOriginal address: http://www.cnblogs.com/yoyoketang/tag/unittest/ObjectiveIn the design of use cases, some use cases are only parameter data input is not the same, such as login this function, operation process but

Class Inheritance:The idea of inheritance is to fully leverage the functionality of existing classes and extend them to define new classes on their basis.Parent class (parents) and child class (subclass):The inherited class is called the parent

1. Os.system (command)This function initiates the child process, executes the command in the child process, and returns the exit state after the command executes, if the command has execution, it is displayed in the standard output. This is actually

From the blog: Shanghai-leisurelyOriginal address: http://www.cnblogs.com/yoyoketang/tag/unittest/ObjectiveIn the previous unittest, the setup can be executed before each execution of the use case, which effectively reduces the amount of code, but

From the blog: Shanghai-leisurelyOriginal address: http://www.cnblogs.com/yoyoketang/tag/js/ObjectiveSometimes the element has been found, the operation is not error, click on the page did not respond. This problem encountered, is more headache,

This post goes from blog: Shanghai-Little TOriginal address: http://blog.csdn.net/real_tino/article/details/59068827When we browse the Web page, we often encounter various patterns of pop-up windows, in the UI Automation testing is bound to deal

1. String removal space# # Strip (self, Chars=none) #去除字符串两端空格 # Lstrip (self, chars=none) #去除字符串左端空格 # Rstrip (self, chars=none) #去除字符串右端空格程序: str1 =  "Hello world!    "Print Str1.strip () print Str1.lstrip () print str1.rstrip () run result: Hello

Python iterator and python Generator 1. yield: Convert the function into a generator (generator) Example: Fibonacci Series Def fib (num): a, B, c = 1, 0, 1 while a 2. Iterable All objects that can use the for loop, collectively referred to as

Python pygame module Installation Process in Linux, pythonpygame 1. Use pip to install the Python package Most newer Python versions have their own pip, so you can first check whether the system has installed pip. In Python3, pip is sometimes called

The differences between values assignment (copy), shortest copy, and deep copy in Python, and values assignment in python 1. Assignment: only copies the reference of the new object and does not open up new memory space.2. Shallow copy: Create a new

Instructor song Tian's zero base Python notes: https://www.bilibili.com/video/av15123607? From = search & seid = 10211084839195730432 #35-37 in page = 25, # Coding = gbk# Instructor song Tian's zero-based Python Note:

Python basics-functions and python Basics A function is a function block that can be called repeatedly. I. Definition Def function name (parameter):... function body... return value Requirements: Def: function keyword Function Name: the name of

Python built-in type (3) -- Comparison, python built-in type  Python has eight comparison operators:,,>,>=,==,!=,is,is notThey have the same priority. Their meanings are as follows: Operator Description Less