For the explicit principle, for k in dict.keys(): seems better.
For simplicity, for k in dict: seems better.
Please help me to make a decision.
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zhigang
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1https://stackoverflow.com/questions/3294889/iterating-over-dictionaries-using-for-loops – tomgalpin Jan 30 '20 at 15:13
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Thank you for the link @tomgalpin. I mainly want to know from style's point of view, which one is more beautiful. I adjusted my question to make it more clear. – zhigang Jan 30 '20 at 15:37
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For functionality, are they exactly the same?
Pretty much yes. dict.keys() actually returns a dict view which is a set, so you can do a few more things with it, but for iteration they'll do the same thing.
For the explicit principle, for k in dict.keys(): seems better.
For simplicity, for k in dict: seems better.
In my experience, both are rarely useful, it's much more common to want and use dict.items() (which really is what the default iterator should have been).
As a result I would recommend dict.keys() to express that you really actually want to iterate on or manipulate dict keys, and are not just misunderstanding what dict iteration does.
