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cheat_sheets_python

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Python

Python's style guide can be found here (PEP 8).

Documentation: I find the W3School site to be more helpful initially. Then, if I need more detail and definition, I got to the official Python doc site (which, honestly, I find difficult to navigate).

W3 Schools:

Python Site: python.org

If you do not want to preface all your script names with python3 to run them, your Python scripts should being with (note: your filesystem address may differ):

#!/usr/bin/python3

Files: Reading From

Use the following syntax when opening and reading a file into a Python program:

with open('filename.txt') as file_object:
    contents = file_object.read()
    print( contents.rstrip() )
  • The open() function returns a file object (an object representing the file).
  • The keyword with closes the file once access to it is no longer needed. This structure will avoid problems…
    • You could open() and close() your file, but if if a bug in your program prevents the close() statement, the file many never close (possible data loss or corruption).
    • The structure above allows Python to automagically close the file when the time is right.
  • The read() method reads then entire file contents and stores it as a string in contents.
    • Note: read() will insert an empty string at EOF which will result in an extra blank line. To remove it, just rstrip().

Web Server

Here's an easy quick Python Web Server in your pwd:

python -m SimpleHTTPServer 8080

Pick a port. 8080 is random. Tab completion works for the module name (-m is for “module”). This allows you to transfer files anywhere on the network.

  • Put your files in the subdir
  • Spin up the Python web server
  • Access that server by IP address: port number (192.168.0.101:8080) from any machine
  • Download files from the server machine to the client machine

Web Server (Py3)

If you use Python 3, you should instead write

python3 -m http.server 8080

Python3 http.server documentation: https://docs.python.org/release/3.0.1/library/http.server.html


FTP One-Liner

Note: You may have to pip install pyftpdlib

python -m pyftpdlib
  1. Ordered List ItemConnect to that machine's IP address with the port number shown.
  2. Download anything. Navigate around.

Check: File Load

Runs main() if file was not imported:

if __name__ == '__main__':
    main()

cheat_sheets_python.1672884006.txt.gz · Last modified: by gman