[Solved] How does formatting a Python date object with str.format() work?

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The date class defines the __format__() magic method, which is called by str.format() to produce a “formatted” string representation of an object. To quote the documentation for date.__format__():

Same as date.strftime(). This makes it possible to specify a format
string for a date object in formatted string literals and when using
str.format(). For a complete list of formatting directives, see
strftime() and strptime() Behavior.

Therefore, '{:%A}'.format(date.today()) is equivalent to date.today().strftime('%A').

solved How does formatting a Python date object with str.format() work?