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Thank you Helmut, I looked at several of those examples and extracted the following tentative information. I need to become a pro-user and obtain an access key via https://www.wikidot.com/account/settings. Then I must create a local file url.txt containing a single line like this:
https://mysite:<apiaccesskey>@www.wikidot.com/xml-rpc-api.php
Then I can do the following in python.

>>> from xmlrpc import client
>>> mypage=client.ServerProxy(url).pages.save_one({"site" : "mysite", "page" : mypage})

In the mean time I have signed up as a pro-user and have obtained a read-write access key that I put it into a local file url.txt as discussed above. Now I would like to carry out any simple python3 command following the examples at https://www.wikidot.com/doc:api. These examples use a syntax like this: s.categories.select({"site": "my-site"}). I know the name of my site. But what is that "s", the prefix to every method? I expected something like client.ServerProxy(url) (as discussed above), but I cannot make it work. Somehow this "s" must inlcude the information about my access key, so about that local file url.txt.
… And now I found the magic command "url=open("url.txt").read()" in the example file FancyDownloader.py.