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6:24
YouTube
Real Python
What is None and How to Test for It
Python uses the keyword None to define null objects and variables. While None does serve some of the same purposes as null in other languages, it’s another beast entirely. As the null in Python, None is not defined to be 0 or any other value. In Python, None is an object. Click here to learn more: https://realpython.com/courses/python-none/
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Want to learn Python? Here's our free 4-hour interactive course
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【2024版Python教程】目前B站最完整的Python零基础全套教程,整整300集,七天就能从小白到大神!少走99%的弯路!存下吧!学不会我退出IT圈!
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