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# Caveats

Since Cython mixes C and Python semantics, some things may be a bit surprising or unintuitive. Work always goes on to make Cython more natural for Python users, so this list may change in the future.

> - Given two typed `int` variables `a` and `b`, `a % b` has the same sign as the second argument (following Python semantics) rather than having the same sign as the first (as in C). The C behavior can be obtained, at some speed gain, by enabling the cdivision directive (versions prior to Cython 0.12 always followed C semantics).

> - Care is needed with unsigned types. `cdef unsigned n = 10; print(range(-n, n))` will print an empty list, since `-n` wraps around to a large positive integer prior to being passed to the `range` function.

> - Python’s `float` type actually wraps C `double` values, and the `int` type in Python 2.x wraps C `long` values.