The doc ofitertools.filterfalse() showspredicate argument as shown below:

itertools.filterfalse(predicate, iterable)

But the docstring ofitertools.filterfalse() showsfunction argument instead ofpredicate argument as shown below:

fromitertoolsimportfilterfalseprint(help(filterfalse))# class filterfalse(builtins.object)#  |  filterfalse(function, iterable, /)# ...

So the docstring ofitertools.filterfalse() should showpredicate argument instead offunction argument for consistency as shown below:

fromitertoolsimportfilterfalseprint(help(filterfalse))# class filterfalse(builtins.object)#  |  filterfalse(predicate, iterable, /)# ...

In addition, boththe doc and docstring ofitertools.takewhile() properly showpredicate argument as shown below:

itertools.takewhile(predicate, iterable)

fromitertoolsimporttakewhileprint(help(takewhile))# class takewhile(builtins.object)#  |  takewhile(predicate, iterable, /)#  ...

And, boththe doc and docstring ofitertools.dropwhile() properly showpredicate argument as shown below:

itertools.dropwhile(predicate, iterable)

fromitertoolsimportdropwhileprint(help(dropwhile))# class dropwhile(builtins.object)#  |  dropwhile(predicate, iterable, /)# ...

Linked PRs

• gh-138186: Use 'predicate' instead of 'function' in filterfalse docstring #144451