How to list all the environment variables in Python
Using os.environ
The os.environ is an object that represents users’ environment variables and their values. It gives you a dictionary with the user’s environmental variable names as they keys and their values as the values. The dictionary supports all the operations of the dictionary data structure in Python.
Listing all the environment variables
In the code below, we loop through the dictionary returned by the os.environ. The key is the name, and value is the value of the environment variables:
import osfor name, value in os.environ.items():print("{0}: {1}".format(name, value))
How to get the value of a specific environment variable
We use the get() method on the dictionary returned by os.environ to get the value of a specific environment variable.
import osname = "PATH"print(os.environ.get(name))
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