How can I read environment variables in Python?

How can I read environment variables in Python?

You can use the os module in Python to read environment variables. For example, you can use os.getenv('VARIABLE_NAME').

What if the environment variable doesn't exist?

If the environment variable doesn't exist, os.getenv() will return None by default. You can also provide a second argument to return a default value.

Can you show me a code example?

Sure! Here's a simple example:

import os

# Read an environment variable
value = os.getenv('MY_VARIABLE', 'default_value')
print(value)

Is there a way to list all environment variables?

Yes, you can use os.environ to get a dictionary of all environment variables. For example:

import os

for key, value in os.environ.items():
    print(f'{key}: {value}')