partial-16.py

import functools

class Article:
    def set_platform(self, platform):
        self.platform = platform

    # Using partialmethod...
    set_substack = functools.partialmethod(
        set_platform,
        'substack',
    )

article = Article()
article.set_substack()

print(article.set_substack.func)
# <bound method Article.set_platform of <__main__.Article
#   object at 0x100844e90>>

print(article.set_substack.args)
# ('substack',)

print(article.set_substack.keywords)
# {}