Modify beginning of PATH-variable with os.environ in python

Question

I know that I can get and modify the PATH variable by doing something like os.environ["PATH"] += "path/to/dir".

But is there any way to ensure that the new path gets written to the beginning of PATH?

yes you can do it the same way you would manipulate strings however, why would you ever do this in Python? this screams of bad practice — gold_cy
– gold_cy, Commented Apr 14, 2020 at 16:55
Yes. Just add the path this way: os.environ['PATH'] = "path/to/dir" + os.environ['PATH'] — PaxPrz
– PaxPrz, Commented Apr 14, 2020 at 16:55
I'm trying to set a directory containing a symlink to a conda-python-interpreter on the PATH-variable at runtime — Lenn
– Lenn, Commented Apr 15, 2020 at 10:15

oittaa · Accepted Answer · 2020-04-14 17:03:25Z

3

os.environ["PATH"] = "path/to/dir" + os.pathsep + os.getenv("PATH")

https://docs.python.org/3/library/os.html

os.pathsep

The character conventionally used by the operating system to separate search path components (as in PATH), such as ':' for POSIX or ';' for Windows. Also available via os.path.

os.getenv(key, default=None)

Return the value of the environment variable key if it exists, or default if it doesn’t. key, default and the result are str.

edited Apr 14, 2020 at 17:03

answered Apr 14, 2020 at 16:56

oittaa

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Data_Is_Everything Over a year ago

add some explanation for what each os calls does.

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