A pretty silly trivial question. The canonical example is f = open('filename'), but

  • f is not very descriptive. After not looking at code in a while, you can forget whether it means "file" or "function f(x)" or "fourier transform results" or something else. EIBTI.
  • In Python, file is already taken by a function.

What else do you use?

python file naming-conventions explicit variable-names
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