Python 3.7 removed support for passing the argument to the built-in functions int(), bool(), float(), list() and tuple() as a keyword argument.

This change is described in the "What's New" for 3.7 (https://docs.python.org/3/whatsnew/3.7.html) in section "API and Feature Removals":

    Functions bool(), float(), list() and tuple() no longer take
    keyword arguments. The first argument of int() can now be passed
    only as positional argument.

The issue is that this change is not described in the documentation of these built-in functions.