Get Django ALLOWED_HOSTS env. variable formated right in settings.py

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I'm facing the following issue. My .env files contains a line like:

export SERVERNAMES="localhost domain1 domain2 domain3" <- exactly this kind of format

But the variable called SERVERNAMES is used multiple times at multiple locations of my deployment so i can't declare this as compatible list of strings that settings.py can use imidiatly. beside I don't like to set multiple variables of .env for basically the same thing. So my question is how can I format my ALLOWED_HOSTS to be compatible with my settings.py. Something like this does not seem to work it seems:

ALLOWED_HOSTS = os.environ.get('SERVERNAMES').split(',')

Thanks and kind regards

environment-variables django python
3 Answers

Simply split your SERVERNAMES variable using space as separator instead of comma

ALLOWED_HOSTS = os.environ.get('SERVERNAMES').split(' ')
user_18879760

The coma is making it a string 

env = "localhost domain1 domain2 domain3"

envs = envs.split(',')

print(envs)

['localhost domain1 domain2 domain3']

Instead just split the string with space and python turns it into a list of strings

env = "localhost domain1 domain2 domain3"

envs = env.split() # By default `str.split()` splits upon spaces

print(envs)

['localhost', 'domain1', 'domain2', 'domain3']
user_129655690

You can also make use of the env.list command.

Put int your .env file:

ALLOWED_HOSTS=example.com,awesomedomain.com,stagingdomain.com

and in python use

ALLOWED_HOSTS = env.list("ALLOWED_HOSTS")
user_179396920
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