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scripting:python [2023/08/10 07:29] – jotasandokuscripting:python [2024/12/23 13:46] (current) – S jotasandoku
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 **__PYTHON__**\\ **__PYTHON__**\\
-\\+ 
 + 
 +== FOLLOW PYTHON CODE (WIP) === 
 + 
 +This is just covering the simple case of an installed python program which is invoked via interactive cli.\\ 
 +I take [[https://github.com/ipspace/netlab]] installed in a virtual environment in Ubuntu.\\ 
 + 
 +The executable archive for the main command (argv[0]) must be present in a location contained in 'PATH'. For example  ''./bin/netlab''. This is what the executable looks like: 
 + 
 +  #!/home/jaime/netsim-labs/bin/python3 
 +  import netsim 
 +  import netsim.cli 
 +  netsim.cli.lab_commands(__file__) 
 + 
 +''netsim'' and ''cli'' are a folder and subfolder under ''./lib/python3.12/site-packages/''. The folders are ''packages'' because, together with a lot of .py files, we have the file ''__init__.py''. It contains common logic 
 + 
 +  * Inside netsim/cli/__init__.py: 
 +    * we have the function ''lab_commands''. Note this function is invoked from the main executable ''netlab'' 
 +    * the standard module ''argparse'' which is a library for common management of interactive cli. See tutorials like  [[https://www.youtube.com/watch?v=aGy7U5ItLRk|this]] 
 + 
 +---- 
 **Python virtual environment**: Isolated "environments" where specific versions of Python can be installed along with independent sets of libraries and dependencies. **Python virtual environment**: Isolated "environments" where specific versions of Python can be installed along with independent sets of libraries and dependencies.
 \\ \\
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 __**REGEX IN PYTHON**__ __**REGEX IN PYTHON**__
 +  * [[https://regex101.com/]]
 +  * [[https://github.com/networktocode/ntc-templates|TextFSM]]
 +  * regex search ways in python: MATCH, SEARCH, FINDALL, and SUB 
  
 **__SEARCH__** **__SEARCH__**
 \\ \\
-Tells us if the match is or isn't in the text. Doesn't care how many times or the found elements themselves:+A found 'yes or no'. Returns a Match object if there is a match anywhere in the string
  
   txt = "The rain in Spain"   txt = "The rain in Spain"
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   vrf_dict = {name_match.group("name"): sub_dict}   vrf_dict = {name_match.group("name"): sub_dict}
                  
 +
 \\ \\
  
-\\ +**FINDALL:** Finds all instances of the matched string. All the occurrences go inside a LIST. 
-  * [[https://regex101.com/]] +
-  * [[https://github.com/networktocode/ntc-templates|TextFSM]] +
-  * ALL INFO [[https://community.cisco.com/t5/controllers/python-netmiko-how-to-print-out-specific-line-matches-with-cisco/td-p/4069348|HERE]] +
-  * All regex can be done with or without [[https://www.stat.berkeley.edu/~spector/extension/python/notes/node79.html|compiling]] but is more efficient. +
-Resources  [[https://docs.python.org/2/library/re.html|here1]] and  [[http://www.pythonlearn.com/html-007/cfbook012.html|here2]]\\ +
-https://panda314159.net/doku.php?id=scripting:python_scripts:regex1.py +
-\\ +
-regex search ways in python: MATCH, SEARCH, FINDALL, and SUB \\ +
-\\ +
-**FINDALL:** Finds all instances of the matched string. All the occurrences go inside a LIST. findall() matches all occurrences of a pattern, not just the first one. We can also use ''compile''+
  
-  re.findall(   'pattern', 'did you find one pattern or many patterns') +  res_list1 = re.findall('pattern', 'did you find one pattern or many patterns') 
   ['pattern', 'pattern']   ['pattern', 'pattern']
  
-Example: find any serial number 8 characters long after the pattern: "Caller pc   :0x": 
-  file = fileh.read() 
-  serials = re.findall(r'Caller pc    :0x([a-zA-Z0-9]{8}\s' , file) 
 \\ \\
 **SUB:** Can replace a parameter.\\ **SUB:** Can replace a parameter.\\
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   """)   """)
 \\ \\
-Slicing lists\\ +== SLICING === 
-  print namelist[:2]   # prints up to but not including index 2. So 0 and 1.+ 
 +  # [:2] - First 2 elements 
 +  print("[:2] ->",  x[:2])  # [0, 1] 
 + 
 +  # [2:] - Everything from index 2 onwards 
 +  print("[2:] ->", x[2:])  # [2, 3, 4, 5, 6, 7, 8, 9] 
 + 
 +  # [-2:] - Last 2 elements 
 +  print("[-2:] ->", x[-2:])  # [8, 9] 
 + 
 +  # [:-2] - Everything EXCEPT last 2 elements 
 +  print("[:-2] ->", x[:-2])  # [0, 1, 2, 3, 4, 5, 6, 7] 
 + 
 + 
 + 
 \\ \\
 Updating list Updating list
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 ---- ----
-NGROK:\\+NGROK: 
 +\\
  
   *     Demoing web sites without deploying   *     Demoing web sites without deploying
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 __CODING NOTES__ __CODING NOTES__
   * [[https://app.coderpad.io/dashboard/questions/examples/]]   * [[https://app.coderpad.io/dashboard/questions/examples/]]
-  * Use a 'list of unchecked cells''... At the end, the index of the only unchecked cell will be the missing page number.+  * Use a ''list of unchecked cells''... At the end, the index of the only unchecked cell will be the missing page number.
  
     pages_qty = len(page_numbers) + 1     pages_qty = len(page_numbers) + 1
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 +
 +----
 +TIME COMPLEXITY:
 +\\
 +[[https://towardsdatascience.com/understanding-time-complexity-with-python-examples-2bda6e8158a7]]
 +\\
 +  * Best case O(1) ; Worst case: O(n!)
  
 ---- ----
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   * Moving-window average algorithm   * Moving-window average algorithm
   * Sorted lists of numbers   * Sorted lists of numbers
 +
 +
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