Python quick tutorial (supplement 02): Python tips
Import Module
In Python, the import declaration is often used to use objects defined in other modules (that is, other. py files.
1) use _ name __
When writing a Python library module, we often run some test statements. When
. There is a module a.py. How do I get Python to know this file hierarchy? It's easy to put a file named _init_.py in each directory. The contents of the file can be empty. The hierarchy is as follows:Parent--__init_.py--child--__init_.py--a.pyb.pySo how does python find the module we define? In standard package SYS, the Path property records the Python package p
directory is named _Init_. Py file. the file content can be blank. the hierarchical structure is as follows:
parent --init_.py --child -- init_.py --a.pyb.py
So how does Python find the module we define? In the standard package sys, the path property records the Python package path. you can print it out:
import sysprint sys.path
Generally, we can put the module package path in the
contents of the file can be empty. The hierarchy is as follows:Parent--__init_.py--child--__init_.py--a.pyb.pySo how does python find the module we define? In standard package SYS, the Path property records the Python package path. You can print it out:Import SysPrint Sys.pathUsually we can put the module's package path into the environment variable Pythonpath, which is automatically added to the Sys.path
understanding of the code, we will naturally understand the "idea" of writing programs 」. It is like writing an article (of course not well written) after learning the English syntax and memorizing the words ). After learning the first book, I tried to complete a small program independently, such as snake and Tetris. If python is used, I can try to write a small program for text processing. At this time, it is a good option to systematically consider
programs. At this time, the systematic consideration of the idea is a good choice. The basic Python tutorial has a lot of examples behind this book, and it's a good time to write those examples.
In addition, there must be a large number of nouns at the beginning to understand. Encounter do not understand the noun as far as possible on the Internet to check, to know the question can also. Do not accumulate
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When reading the concise Python tutorial, the 8th and 14 chapters have the use of the SYS module, One of the notes about SYS.ARGV is a little confused, let oneself ponder for a long time, later only dawned, here to share what I understand, in order to facilitate and I have the same confused Python learners can better understand.The following code comes from a con
Zhipu Education Python Video Tutorial Primer basics, Python notesPrintID () memory addressType () variableThe Windows command-line Edit commandPython data type does not require a specified typeDefine Hostname= "www.google.com"The results always tell me after running nameerror:name ' socket ' is not definedWho will help me analyze, how to change theI didn't use th
the global start-up fi Le using code like if os.path.isfile ('. pythonrc.py '): execfile ('. pythonrc.py '). If you want to use the "startup file in a" script, you must does this explicitly in the script:OSos. Environ. Get(' Pythonstartup ')os. Path. Isfile(filenameexecfile(filename) 2.2.5. The Customization ModulesPython provides-hooks to let you customize it: sitecustomize and usercustomize. To see how it works, you need first-to-find the location of your user site-packages director
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This article mainly shares a graphic tutorial on building a python development environment in Win7. This article mainly describes detailed steps for installing Python, pip, and interpreter. If you are interested, refer
Install Python
1. Download Python suitable for the Syst
Python learning-Python short tutorialPreface
This tutorial combines Stanford CS231N and UC Berkerley CS188 Python tutorials.The tutorial is short, but it is suitable for children's shoes who have learned other languages based on certain programming basics.Start
After you configure environment variables, you can typically call Python directly from Python or by specifying a python version number.
The Python interpreter operates like a Unix shell: it interactively interprets and executes commands when using a terminal device (TTY) as a standard input call, reads the f
The Python version used for this tutorial is 2.7!!!At the beginning of college, always on the internet to see what reptiles, because at that time is still learning C + +, no time to learn python, but also did not go to learn the crawler, and take advantage of this project to learn the basic use of Python, so have menti
This set of Python learning roadmap for everyone, follow this tutorial step by step learning, will certainly have a deeper understanding of Python. Maybe you can enjoy python 's easy-to-learn, streamlined, open-source language. This set of tutorials, not only video tutorials, as well as source sharing, so that everyon
same linePython can use multiple statements in the same row, with semicolons (;) split between statements, and here's a simple example:Import ' Runoob ' ' \tabc\n ')Print outputThe print default output is newline, and if you want to implement no wrap, you need to add a comma to the end of the variable:Multiple statements form a code groupIndenting the same set of statements constitutes a block of code, which we call the code group.Compound statements such as if, while, Def, and class, the first
As I said in the previous section, after installing Python, after entering "python" on the command line, if successful, you will get a window similar to the following:As you can see, there are 3 > symbols (>>>) at the end. >>> is called the python command prompt (prompt), when Python waits for you to enter the code. Yo
Python is a simple tutorial for data analysis, and python uses data analysis
Recently, Analysis with Programming has joined Planet Python. As the first special blog of this website, I will share with you how to start data analysis using Python. The details are as follows:
Da
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