Bogdans comment is right, the WSDL is just the contract between Webservice provider and consumer, you might use it for code generation but it is not a must (although very helpful).
SOAP is "simply" (okay it's not, anyway ;) specialized/standardized XML via HTTP(s). Therefore you don't really need special modules for doing the call itself, you just need a HTTP library which is capable of sending HTTP-POST requests.
Have a look here for an example:
Sending SOAP request using Python Requests
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