[Python] Paramiko PKey.from_private_key_file gives me "__init__() got an unexpected keyword...

I get very weird behaviour from paramiko:

bla=paramiko.pkey.PKey(msg=None,data=None).from_private_key_file()


TypeError Traceback (most recent call last)
<ipython-input-32-13288f655ecf> in <module>
----> 1 paramiko.pkey.PKey(msg=None,data=None).from_private_key_file()

TypeError: from_private_key_file() missing 1 required positional argument: 'filename'


here it tells me I need a filename, but then whenever I try to specify anything:

bla=paramiko.pkey.PKey(msg=None,data=None).from_private_key_file('key')


Traceback (most recent call last)
<ipython-input-33-5fa0cf9b6317> in <module>
----> 1 bla=paramiko.pkey.PKey(msg=None,data=None).from_private_key_file('key')

~/anaconda3/lib/python3.7/site-packages/paramiko/pkey.py in from_private_key_file(cls, filename, password)
233 :raises: `.SSHException` -- if the key file is invalid
234 """
--> 235 key = cls(filename=filename, password=password)
236 return key
237

TypeError: __init__() got an unexpected keyword argument 'filename'


Can anyone explain to me what's happening? I'm completely confused.

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