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python [2017/10/17 09:19]
belohlavek [Virtual environments]
python [2018/10/08 10:56] (current)
vodrazka [Python]
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 In this guide, I expect you are using Python3 (and ''​pip3''​),​ but (for old projects) you can use Python2 (and ''​pip2''​) as well.  In this guide, I expect you are using Python3 (and ''​pip3''​),​ but (for old projects) you can use Python2 (and ''​pip2''​) as well. 
  
-  * You can use the system Python (currently ​2.7.6 and 3.4.3, in Ubuntu ​14.04), but it is a bit old and will be changed when a new Ubuntu is installed at ÚFAL.+  * You can use the system Python (currently ​3.6.5, in Ubuntu ​18.04)
   * You can use any Python from ''/​opt/​python/'',​ e.g. for 3.6.3 add the following line to your .bashrc: <​code>​export PATH=/​opt/​python/​3.6.3/​bin:"​${PATH}"</​code>​   * You can use any Python from ''/​opt/​python/'',​ e.g. for 3.6.3 add the following line to your .bashrc: <​code>​export PATH=/​opt/​python/​3.6.3/​bin:"​${PATH}"</​code>​
   * You can install modules with ''​pip3''​. If you are not using any [[#virtual environments]],​ you must add the ''​-''''​-user''​ option, so it is installed in your home. In this case, don't forget the executable scripts are installed in ''​~/​.local/​bin/'',​ so add the following line to your .bashrc: <​code>​export PATH=~/​.local/​bin:"​${PATH}"</​code>​   * You can install modules with ''​pip3''​. If you are not using any [[#virtual environments]],​ you must add the ''​-''''​-user''​ option, so it is installed in your home. In this case, don't forget the executable scripts are installed in ''​~/​.local/​bin/'',​ so add the following line to your .bashrc: <​code>​export PATH=~/​.local/​bin:"​${PATH}"</​code>​
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     python3 -m venv my-project-name     python3 -m venv my-project-name
 where ''​my-project-name''​ can be a relative or absolute path to a directory which will be created. where ''​my-project-name''​ can be a relative or absolute path to a directory which will be created.
-**Caveat:** the path to the directory should be rather short, there is a limit on shebang paths so you can get strange errors like ''​ipython3:​ bad interpreter:​ No such file or directory''​ if your ipython3 is installed in the venv starts with ''#​!/​..a..very..long..path..''​+**Caveat1:** the path to the directory should be rather short, there is a limit on shebang paths so you can get strange errors like ''​ipython3:​ bad interpreter:​ No such file or directory''​ if your ipython3 is installed in the venv starts with ''#​!/​..a..very..long..path..''​ 
 +**Caveat2:​** If ''​my-project-name''​ is a relative path, it will be concatenated with ''​pwd -P'',​ i.e. with your actual directory with all symlinks resolved. If you want symlinks in the path, you must provide absolute path as ''​my-project-name''​. Note that e.g. ''/​net/​work/​people''​ is currently (2018-06) resolved by ''​pwd -P''​ to ''/​lnet/​.nfs/​spec/​work/​people/'',​ but this path does not work on machines with native Lustre support.)
  
 You can use any Python version for the new environment,​ e.g. ''/​opt/​python/​3.5.4/​bin/​python3 -m venv my-project-name-python3.5''​ You can use any Python version for the new environment,​ e.g. ''/​opt/​python/​3.5.4/​bin/​python3 -m venv my-project-name-python3.5''​

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