Is there any method to append path to environment variable 'PATH' in python

Question

I want to append the path to exists environment variable PATH using python script.

I have tried to use os.environ['path'] = 'C:\foo\bin:%PATH%', but its deleting all the existing paths and creating 'C:\foo\bin:%PATH%' as new path value.

os.environ['path'] = 'C:\foo\bin:%PATH%'

Do you want your chances to be presistent when the script has finished running? — FlyingTeller
– FlyingTeller, Commented Sep 16, 2019 at 11:05
@moeassal... I want to add multiple bin from different folders and some folders — KALYAN
– KALYAN, Commented Sep 16, 2019 at 11:18

moe asal · Accepted Answer · 2019-09-16 11:24:33Z

8

You should be able to modify os.environ.

Since os.pathsep is the character to separate different paths, you should use this to append each new path:

os.environ["PATH"] += os.pathsep + path

or, if there are several paths to add in a list:

os.environ["PATH"] += os.pathsep + os.pathsep.join(pathlist)

As you mentioned, os.path.join can also be used for each individual path you have to append in the case you have to construct them from separate parts.

answered Sep 16, 2019 at 11:24

moe asal

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Optimus · Accepted Answer · 2019-09-16 11:09:17Z

5

You should be doing

  import os

  os.environ["PATH"] = "/your/path/"+ os.pathsep + os.environ["PATH"]

answered Sep 16, 2019 at 11:09

Optimus

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2 Comments

Night Train Over a year ago

Is there any particular reason why you would want or even need to insert the new path at the front?

Optimus Over a year ago

it is normally good to append it at the front so that in case there is another binary with the same name in os.environ["PATH"], the one in /your/path/ will take precedence. the lookup happens from left to right

FlyingTeller · Accepted Answer · 2019-09-16 11:07:57Z

0

In your code:

os.environ['path'] = 'C:\foo\bin:%PATH%

python does not know what to do with %PATH% in the string, but the old value of the PATH environment variable is accessible as os.environ['path'], so you can simply do:

os.environ['path'] = 'C:\foo\bin;' + os.environ['path']

answered Sep 16, 2019 at 11:07

FlyingTeller

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