Python quirks

Modulo and integer division works differently from C! In C it’s:

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7 % 3 = 1
-7 % 3 = -1
7 % -3 = 1
-7 % -3 = -1

But in Python:

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>>> 7 % 3
1
>>> -7 % 3
2
>>> 7 % -3
-2
>>> -7 % -3
-1

Aaand for Python’s Decimal it’s different. So yeah, more ways to shoot yourself in the foot.

This is not a tuple:

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a = (123) # int

This is a tuple:

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b = (123,) # tuple

By default, call stack is limited to 1000 frames. Weird, but OK.

• Common Gotchas — The Hitchhiker’s Guide to Python