Python

Error, Debug, and test:Error handling:Try: print (' Try ... ') r = 10/0 print (' Result: ', R) except Zerodivisionerror as E: print (' except: ', E) Finally: print (' finally ... ') print (' END ')The first is to execute the statement,

1. Query module: According to the directory to find the module to be imported, module directory generally in:/usr/lib64/python2.7In [2]: sys.pathout[2]:[', '/usr/bin ', '/usr/lib64/python2.7/site-packages/mysql_python-1.2.5-py2.7-linux-x86_64. Egg ',

　　Starting today, I'm going to keep writing a blog every week, a review of my week's learning summary and knowledge. This can deepen the understanding of learning and understanding, small language or something is not good, but I do not write novels

Title: Python achieves three landingsDo not rush to write three times immediately, it is necessary to simplify the complex procedures, you must step-by-step to expand, so as to ensure that there will be no error.Step one: Achieve a simple one-time

The following main points are from: http://wiki.jikexueyuan.com/project/explore-python/Standard-Modules/argparse.htmlArgparse using a simple exampleLet's look at a simple example first. There are three main steps: Create a Argumentparser ()

Threads and processes, whether using methods or concepts, are almost the same, with the main distinction being that the conceptual aspects of different threads can be thought of as part of a process, which is divided into the primary and child

Tag:details   copy    logic judgment    ant   ping    print   sel   net    usage     Python if not determines whether the case is none if the Xif x is Noneif isn't x is none if the X is not none "is the best way to do it, clear, without errors, and

The generator is also an iterator that computes the next data on demand with the next () functionList Builder, which makes the code more concise, only records the current location, only __next__ (),(I*2 for I in range (10))Generator (Generator)1

Identifiers in Python can contain numbers, letters, and _, but must begin with a letter or _, where a name beginning with _ generally has a special meaning.Both front and back are named with double underline __Typically used for naming special

Lebyan: Make your code more concise>>> [i*2 for I in range (10)][0, 2, 4, 6, 8, 10, 12, 14, 16, 18]Generator is to save memory space, the generator will be called when the corresponding data generated, not called when only allocating memory;There is

Weekend, but I'm not fit to have a weekend ah, 7.9 awake, continue to look at Python, yesterday downloaded a tool pycharm, this tool and idea is a family. Use almost, today continue to look at the foundation.Write format: Python is particularly

Two. Install PIP for python3.xIn fact, this is not difficult. Download a package and execute two commands.1. First install the SetuptoolsSmall partners can be downloaded via the Official module library: Https://pypi.python.org/pypiHere I will

---restore content starts---Array listAdd the. Append (i, ' xxx ') methodDelete with the. Pop (i) method, where I is the index positionArray can be inserted directly as an elementTuple tuples (cannot be changed after initialization, so-called

Introduction to int internal functionsYou can view all the functions inside an int by using the Dir (value of type int) or by CTRL + click Int. Internal functions are many, but many of the internal functions are not commonly used, the following are

Python uses regular expressions to replace successfully matched groups and outputs the number of replications. python Regular Expressions A regular expression is a special character sequence that helps you easily check whether a string matches a

Python virtualenv simple usage (required), pythonvirtualenv What is virtualenv? Virtualenv can create an independent Python development environment. For example, the current global development environment is python3.6. Now we need to use django1.3

Python auto crop image code sharing, python image Cropping This code can help you automatically cut out the blank area on the edge of the image. If your image has a large blank area (as long as it is the same color to form a certain area, it is

Describes how to use Python to compile the vim plug-in and the pythonvim plug-in. Preface Vim is a great editor, not only in her maverick editing method, but also in her powerful scalability. However, vim's language vimL function for writing

Example of the bucket sorting algorithm implemented by Python and the python Sorting Algorithm This example describes the bucket sorting algorithm implemented by Python. We will share this with you for your reference. The details are as

Exploration of python decorators and collection of parameters, and decoration of python First, go to the original article, Now, let's assume that we want to enhance the functions of the now () function, for example, to automatically print logs