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[py3.8+] 1-liner: walruses and datetime solution in Creative category for Weekly Calendar by Phil15
weekly_calendar=lambda y,m,d,f,D=__import__('datetime'):(x:=7-(((t:=D.date(y,m,d)).weekday()-f)%7))and[(t+D.timedelta(k)).day for k in range(x-7,x)]
Sept. 1, 2020