python

What does if __name__ == “__main__”: do?

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What does this do? [python]if __name__ == "__main__": print("Hello world!") [/python]   40   Short It’s boilerplate code that protects users from accidentally invoking the script when they didn’t intend to. Here are some common problems when the guard is omitted from a script: If you import the guardless script in another script (e.g. import … Read more

What does the “yield” keyword do?

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Want to improve this post? Provide detailed answers to this question, including citations and an explanation of why your answer is correct. without enough detail may be edited or deleted. What is the use of the yield keyword in Python? What does it do? For example, I’m trying to understand this code1: def _get_child_candidates(self, distance, … Read more

Python script header

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First, any time you run a script using the interpreter explicitly, as in $ python ./my_script.py $ ksh ~/bin/redouble.sh $ lua5.1 /usr/local/bin/osbf3 the #! line is always ignored. The #! line is a Unix feature of executable scripts only, and you can see it documented in full on the man page for execve(2). There you will find that the word following #! must be the … Read more