Python Programming Notes [KPTree Wiki]

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======Python Programming Notes======
Here are my notes from starting to use and learn the python programming language.
I am only focusing on Python 3 at this time.

{{tag>python subprocess subprocess.run}}
=====subprocess module=====
The subprocess module allows you to spawn new processes, connect to their input/output/error pipes, and obtain their return codes.\\
Some key points:
  *The command to be run arguments "args" should be passed in as a list, the list components should not contain any white space. e.g.:
    * ''args=[cmd, '-I', 'lanplus', '-H', BMC_IP, "-U", User_Name, '-f', PW_file_location, 'power', power_ctl]'', where components in quotation are text and those without are variables.
    * With argument type the input option ''shell=False'' must be set.  This is the default default and preferred option.
  * ''stdout=subprocess.PIPE''  In order to capture the command output from the function. Otherwise it will go to the standard output stream, e.g. the terminal screen.
    * the output value can be captured from ''subprocess.stdout'', this is in byte format.  
    * It can be captured and converted to text format ''subprocess.stdout.decode('utf-8')''
    * The return code of the function can be capture from output using  ''subprocess.returncode''

=====Python Back-up Scripts=====
My python based back-up scripts are located here: [[home_server:home_server_setup:other_services:back-up_server#python_backup_scripts]]
=====Some on line resources=====
  *[[https://docs.python.org/3/library/subprocess.html#popen-objects|Python Docs - Subprocess management]]
  *[[https://www.geeksforgeeks.org/python-execute-and-parse-linux-commands/|Python | Execute and parse Linux commands]]
  *[[https://www.golinuxcloud.com/python-subprocess/|10+ practical examples to learn python subprocess module]]
  *[[https://stackoverflow.com/questions/49371575/print-subprocess-popen|Print Subprocess.Popen]]
  *[[https://www.pythonpool.com/python-bytes-to-string/|5 Ways to Convert bytes to string in Python]]
  *[[https://opensourceoptions.com/blog/how-to-pass-arguments-to-a-python-script-from-the-command-line/|How to Pass Arguments to a Python Script from the Command Line]]
  *[[https://www.golinuxcloud.com/python-write-to-file/|How to create, read, append, write to file in Python]]
  *[[https://www.programiz.com/python-programming/exception-handling|Python Exception Handling Using try, except and finally statement]]

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