How to add to the PYTHONPATH in Windows so it finds my modules packages

Question

I have a directory which hosts all of my Django apps  C  My Projects   I want to add this directory to my PYTHONPATH so I can call the apps directly   I tried adding C  My Projects   to my Windows Path variable from the Windows GUI  My Computer  gt  Properties  gt  Advanced System Settings  gt  Environment Variables   But it still doesn t read the coltrane module and generates this error      Error  No module named coltrane

User · Answer

The easiest way to do that successfully  is to run the python installer again  after the first installation  and then    choose Modify  check the optional features which you want and click Next  here we go  in  Advanced Options  step you must see an option saying  Add Python to environment variables   Just check that option and click Install   When the installation is completed  python environment variables are added and you can easily use python everywhere

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Windows 7 Professional I Modified  mongoose za s answer to make it easier to change the python version     Right Click Computer   Properties  Advanced System Settings   Environment Variables Click  New  under  System Variable  Variable Name  PY HOME  Variable Value C  path to python version  Click  OK  Locate the  Path  System variable and click  Edit  Add the following to the existing variable    PY HOME   PY HOME  Lib  PY HOME  DLLs  PY HOME  Lib lib-tk   Click  OK  to close all of the windows     As a final sanity check open a command prompt and enter python  You should see    gt python  whatever version you are using    If you need to switch between versions  you only need to modify the PY HOME variable to point to the proper directory  This is bit easier to manage if you need multiple python versions installed

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To augment PYTHONPATH  run regedit and navigate to KEY LOCAL MACHINE  SOFTWARE Python PythonCore and then select the folder for the python version you wish to use  Inside this is a folder labelled PythonPath  with one entry that specifies the paths where the default install stores modules  Right-click on PythonPath and choose to create a new key  You may want to name the key after the project whose module locations it will specify  this way  you can easily compartmentalize and track your path modifications   thanks

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Maybe a little late  but this is how you add the path to the Windows Environment Variables    Go to the Environment Variables tab  you do this by pressing Windows key   Pausa inter  Go to Advanced System Settings  Click on Environment Variables  On the lower window search for the  Path  value  Select it Click on Edit In the end of the line add your instalation folder and the route to  Scripts  folder  Click ok  aceptar etc    You re done  enter cmd and write python from any location of your drive  it should enter the Python program   Example with my pc  I have Python34   EXISTING LINES C  Python34 C  Python34 Scripts    Hope it helps   Greetings from Bogot

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The easier way to set the path in python is    click start  My Computer  Properties   Advanced System Settings   Environment Variables   second windows       select Path   Edit   and then add   C  Python27  C  Python27 Scripts    link  http   docs python-guide org en latest starting install win

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The PYTHONPATH environment variable is used by Python to specify a list of directories that modules can be imported from on Windows  When running  you can inspect the sys path variable to see which directories will be searched when you import something   To set this variable from the Command Prompt  use  set PYTHONPATH list of paths   To set this variable from PowerShell  use   env PYTHONPATH    list of paths    just before you launch Python   Setting this variable globally through the Environment Variables settings is not recommended  as it may be used by any version of Python instead of the one that you intend to use  Read more in the Python on Windows FAQ docs

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You need to add to your PYTHONPATH variable instead of Windows PATH variable   http   docs python org using windows html

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From Windows command line   set PYTHONPATH  PYTHONPATH  C  My python lib   To set the PYTHONPATH permanently  add the line to your autoexec bat  Alternatively  if you edit the system variable through the System Properties  it will also be changed permanently

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In Python 3 4 on windows it worked when I added it to PATH enviroment variable instead of PYTHONPATH  Like if you have installed Python 3 4 in D  Programming Python34 then add this at the end of your PATH environment variable   D  Programming Python34   Close and reopen command prompt and execute  python   It will open the python shell  This also fixed my Sublime 3 issue of  python is not recognized as an internal or external command

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This question needs a proper answer   Just use the standard package site  which was made for this job   and here is how  plagiating my own answer to my own question on the very same topic       Open a Python prompt and type    gt  gt  gt  import site  gt  gt  gt  site USER SITE  C   Users  ojdo  AppData  Roaming  Python  Python37  site-packages         Create this folder if it does not exist yet         gt  gt  gt  import os  gt  gt  gt  os makedirs site USER SITE         Create a file sitecustomize py in this folder containing the content of FIND MY PACKAGES  either manually or using something like the following code  Of course  you have to change C  My Projects to the correct path to your custom import location         gt  gt  gt  FIND MY PACKAGES       import site site addsitedir r C  My Projects        gt  gt  gt  filename   os path join site USER SITE   sitecustomize py    gt  gt  gt  with open filename   w   as outfile          print FIND MY PACKAGES  file outfile    And the next time you start Python  C  My Projects is present in your sys path  without having to touch system-wide settings  Bonus  the above steps work on Linux  too

User · Answer

import sys sys path append  path to Modules   print sys path   This won t persist over reboots or get translated to other files  It is however great if you don t want to make a permanent modification to your system

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This PYTHONPATH variable needs to be set for ArcPY when ArcGIS Desktop is installed    PYTHONPATH C  arcgis bin  your ArcGIS home bin   For some reason it never was set when I used the installer on a Windows 7 32-bit system

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For anyone trying to achieve this with Python 3 3   the Windows installer now includes an option to add python exe to the system search path  Read more in the docs

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Just append your installation path  ex  C  Python27   to the PATH variable in System variables  Then close and open your command line and type  python

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You can set the path variable for easily by command prompt     Open run and write  cmd In the command window write the following  set path  path  C  python36 press enter  to check write python and enter  You will see the python version as shown in the picture

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Adding Python and PythonPath to the Windows environment    Open Explorer  Right-click  Computer  in the Navigation Tree Panel on the left  Select  Properties  at the bottom of the Context Menu  Select  Advanced system settings  Click  Environment Variables     in the Advanced Tab Under  System Variables     Add   PY HOME  C  Python27  PYTHONPATH   PY HOME  Lib  PY HOME  DLLs  PY HOME  Lib lib-tk C  another-library   Append   path   PY HOME   PY HOME  Scripts

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These solutions work  but they work for your code ONLY on your machine  I would add a couple of lines to your code that look like this   import sys if  C   My Python Lib  not in sys path      sys path append  C   My Python Lib     That should take care of your problems

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I got it worked in Windows 10 by following below steps   Under environment variables  you should only add it under PATH of  System Variables  and not under  User Variables   This is a great confusion and eats time if we miss it   Also  just try to navigate to the path where you got Python installed in your machine and add it to PATH  This just works and no need to add any other thing in my case I added just below path and it worked      C  Users YourUserName AppData Local Programs Python Python37-32   Most important  close command prompt  re-open and then re-try typing  python  to see the version details  You need to restart command prompt to see the version after setting up the path in environment variables   After restarting  you should be able to see the python prompt and below info when typing python in command prompt

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You can also add a  pth file containing the desired directory in either your c  PythonX X folder  or your  site-packages folder  which tends to be my preferred method when I m developing a Python package   See here for more information

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You know what has worked for me really well on windows   My Computer  gt  Properties  gt  Advanced System Settings  gt  Environment Variables  gt    Just add the path as C  Python27  or wherever you installed python   OR  Then under system variables I create a new Variable called PythonPath  In this variable I have C  Python27 Lib C  Python27 DLLs C  Python27 Lib lib-tk C  other-folders-on-the-path    This is the best way that has worked for me which I hadn t found in any of the docs offered   EDIT  For those who are not able to get it  Please add      C  Python27    along with it  Else it will never work

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The python 2 X paths can be set from few of the above instructions  Python 3 by default will be installed in  C  Users  AppData Local Programs Python Python35-32  So this path has to be added to Path variable in windows environment

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While this question is about the  real  Python  it did come up in a websearch for  Iron Python PYTHONPATH   For Iron Python users as confused as I was  It turns out that Iron Python looks for an environment variable called IRONPYTHONPATH   Linux Mac POSIX users  Don t forget that not only does Windows use   as path separators  but it also uses   as path delimiters  not

[python] How to add to the PYTHONPATH in Windows, so it finds my modules/packages?

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