Python Base Usage

谁借莪１个温暖的怀抱￠ 2021-09-22 15:12 297阅读 0赞

# Cause #

: python简明教程(中文完整版-高清-带书签).pdf [https://download.csdn.net/download/github\_34103268/10207978][https_download.csdn.net_download_github_34103268_10207978]

# Install #

download form official site: [https://www.python.org/][https_www.python.org] then install, attention that select "ADD PATH'.

# hello world program #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podW9odWkzMDczMTc2ODQ_size_16_color_FFFFFF_t_70][]

Of cause, beter use the IDLE to coding, whitch can debugging, highline, and so on.

![20181122094408595.png][]

# IDE #

Suggest using VSCODE to coding, because vscode could confiure that code hinting like using vc++ through vs2008.

Confiure method:

If you using vscode open \*.py file, will prompt you to install 'Python' extension, just install it as blow:

![20181205194347454.png][]

Then the result is:

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podW9odWkzMDczMTc2ODQ_size_16_color_FFFFFF_t_70 1][]

**Press "F5", python would execute.**

When have wrong, will prompt you: (This is so good)

![20181206093009104.png][]

When you debuging program, don't need "Ctrl+S", just input "**Shift+Ctrl+F5**", would saved and reset to run.

# Debug #

Refer: [https://pythonconquerstheuniverse.wordpress.com/2009/09/10/debugging-in-python/][https_pythonconquerstheuniverse.wordpress.com_2009_09_10_debugging-in-python]

1.Add in source code:

import pdb
    pdb.set_trace()

Then will turn to debug mode, as below:

![20181207143721466.png][]

Then you could use command in command-line.

n
    q
    p
    c
    l
    s
    r

# Switch python 3 to python 2 #

1.Down python 2.7 in  official site.

2.Use sbolute path. Such as add a "OpenPython2.7.bat" file, contain is

C:\Python27\python.exe

Or change the Environment Path Value (This way is better).

Change "C:\\Python27\\python.exe" to "C:\\Python27\\python2.exe"

Then add the path "C:\\Python27\\", so now you can derict use the command "python2".

(over)

[https_download.csdn.net_download_github_34103268_10207978]: https://download.csdn.net/download/github_34103268/10207978
[https_www.python.org]: https://www.python.org/downloads/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podW9odWkzMDczMTc2ODQ_size_16_color_FFFFFF_t_70]: /images/20210920/ff8cca81013543bca5bfab3d9bf73679.png
[20181122094408595.png]: /images/20210920/b5aa7fd379fb48c3a89943af890ad95c.png
[20181205194347454.png]: /images/20210920/7261918d26ee4d0ba76ba8be2e52bda5.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podW9odWkzMDczMTc2ODQ_size_16_color_FFFFFF_t_70 1]: /images/20210920/652b7ded93044b4b8051436d35850fb4.png
[20181206093009104.png]: /images/20210920/0dbe217df2c74d118a9bd37d1b0abd9c.png
[https_pythonconquerstheuniverse.wordpress.com_2009_09_10_debugging-in-python]: https://pythonconquerstheuniverse.wordpress.com/2009/09/10/debugging-in-python/
[20181207143721466.png]: /images/20210920/702a69497e3f423599c6ec4a91348688.png