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other:python:starting [2019/04/26 11:57] – Improved the quick start section jypeterother:python:starting [2019/05/17 10:56] – [Initialization] Improved jypeter
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   - Start a terminal on an //obelix// server   - Start a terminal on an //obelix// server
-  - Type ''python'' to access the //default Python 2// interpreter or follow the steps below to use the more complete //CDAT// distribution. Remember that **you can exit the interpreter by typing CTRL-D** (or ''quit()'' or ''exit()'')+  - Type ''python'' to access the //default Python 2// interpreter available on the servers... 
 +  - ...or follow the steps below to use the more complete //CDAT// distribution.\\ Remember that **you can exit the interpreter by typing CTRL-D** (or ''quit()'' or ''exit()'')
     - Determine if you are using a [[other:newppl:starting#which_shell_are_you_using|bash or tcsh shell]], then type the following command to initialize //conda//     - Determine if you are using a [[other:newppl:starting#which_shell_are_you_using|bash or tcsh shell]], then type the following command to initialize //conda//
       * In a //bash// shell: ''source ~jypeter/.conda3_jyp.sh''       * In a //bash// shell: ''source ~jypeter/.conda3_jyp.sh''
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     - Choose which //flavor// of Python you want by typing:     - Choose which //flavor// of Python you want by typing:
       * Python 2.7.x: ''conda activate cdatm_py2''       * Python 2.7.x: ''conda activate cdatm_py2''
-      * Python 2.7.x: ''conda activate cdatm_py3''+      * Python 3.x: ''conda activate cdatm_py3''
     - Type ''python'' to start the interpreter     - Type ''python'' to start the interpreter
 +    - Note: if you will have to use python regularly, you should add the ''source'' line above to your ''.cshrc'' /''.login'' file (//tcsh// users) or ''.bashrc''/''.profile'' (//bash// users)
 +      * **Do not** add the ''conda activate cdatm_pyN'' line to the shell config files, because this will create potential side-effects!\\ Only type this activation line in the terminals where you will need to use this specific version of Python
  
 ==== Useful keyboard shortcuts ==== ==== Useful keyboard shortcuts ====
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 Note: Anaconda provides and uses ''conda'' for its installation. Since UV-CDAT is now also installed and maintained with ''conda'', you can read the [[other:uvcdat:conda_notes|Installing and maintaining UV-CDAT with conda]] page for more information, even if you are not going to use UV-CDAT Note: Anaconda provides and uses ''conda'' for its installation. Since UV-CDAT is now also installed and maintained with ''conda'', you can read the [[other:uvcdat:conda_notes|Installing and maintaining UV-CDAT with conda]] page for more information, even if you are not going to use UV-CDAT
  
-===== Launching Python ===== +===== ipython =====
- +
-Once you have initialized the [[#some_python_distributions|python distribution]] you want to use, follow the instructions below to //start the interpreter from a shell// (on a Windows computer, you will have to start python from the //Start// menu or by clicking a shortcut on your desktop). +
- +
-Remember that on Linux/Mac you can check which python you are using by typing ''which python''! +
- +
-==== Useful keyboard shortcuts ==== +
- +
-^  Key  ^  Effect  ^ +
-|  **CTRL-D**  |  Exit the interpreter  | +
-|  **↑ and ↓**  |  Go to previous/next line(s)  | +
-|  **CTRL-A**  |  Go to the beginning of the line  | +
-|  **CTRL-E**  |  Go to the end of the line  | +
-|  **CTRL-K**  |  Erase from the cursor to the end of the line  | +
-|  **CTRL-U**  |  Erase from the beginning of the line to the cursor  | +
-|  **TAB** x 2  |  Do some TAB-completion (context dependent)\\ e.g. ''a = np.cum**TABTAB**''  | +
-|  **CTRL-C**  |  Interrupt a running script  | +
-|  **CTRL-Z**  |  Suspend the interpreter and go back to the shell\\ **Do not forget** to go back to the interpreter with ''fg''\\ or to kill it (with ''jobs'' and ''kill %NN'')  | +
- +
-==== Stand-alone script ==== +
- +
-A python script is just like any other shell script. You don't have to explicitly call the python interpreter, if the interpreter is specified in a ''#!'' [[https://en.wikipedia.org/wiki/Shebang_%28Unix%29|shebang comment]] on the first line of the script with, and the script has its execution bit set (''chmod +x my_script.py'').  +
- +
-<code> +
-jypeter@asterix1 - ...jypeter - 54 >cat basic_script.py +
-#!/usr/bin/env python +
- +
-import sys +
- +
-script_name = sys.argv[0] +
- +
-print('Hello world, I am the ' + script_name + ' script') +
- +
-# The end +
- +
-jypeter@asterix1 - ...jypeter - 55 >chmod +x basic_script.py +
- +
-ypeter@asterix1 - ...jypeter - 56 ># Type here what is required to initialize the distribution you want +
- +
-jypeter@asterix1 - ...jypeter - 57 >./basic_script.py +
-Hello world, I am the ./basic_script.py script +
-</code> +
- +
-==== Standard interpreter ==== +
- +
-  * ''python'': start the interpreter +
-  * ''python script.py'': execute //script.py// and **exit** +
-  * ''python -i script'': execute //script.py// and **stay in the interpreter** (''-i'' = //**I**nteractive//) +
- +
-Type ''man python'' if you want to see what other command line options are available+
  
 ==== ipython interpreter ==== ==== ipython interpreter ====
other/python/starting.txt · Last modified: 2025/07/03 16:18 by jypeter
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