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floatrange
floatrange is a Python module which mimics Python's builtin range() function with support of float values (Python range() builtin only works with int values). As for range(), the given stop value is not in the generated sequence.
Its primary usage is in for loops on arithmetic progression of non-integer values. For operations like contains test (Python in operator), computation of value index, and count of value occurences in a floatrange, a precision parameter allows to limit problems with floating point computation.
It works as is with Python 2 and Python 3.
Example from source documentation:
>>> from floatrange import floatrange
>>> floatrange(5)
floatrange(0.0, 5.0, 1.0)
>>> list(floatrange(5))
[0.0, 1.0, 2.0, 3.0, 4.0]
>>> list(floatrange(3.2,5.4,0.2))
[3.2, 3.4000000000000004, 3.6, 3.8000000000000003, 4.0, 4.2, 4.4, 4.6000000000000005, 4.800000000000001, 5.0, 5.2]
>>> list(floatrange(-6,-8,-0.3))
[-6.0, -6.3, -6.6, -6.9, -7.2, -7.5, -7.8]
>>> 6 in floatrange(1,8)
True
>>> 6.1 in floatrange(1,8,1,prec=0.2)
True
>>> 6.1 in floatrange(1,8,1,prec=0.05)
False
>>> list(reversed(floatrange(5)))
[4.0, 3.0, 2.0, 1.0, 0.0]
>>> list(floatrange(10.1,9.7,-0.1))
[10.1, 10.0, 9.9, 9.799999999999999]
Other solution
If you have the scipy's numpy package installed, see numpy.arange() and numpy.linspace(). If you have heavy computation, this is the way to go.
Note these differences between numpy functions and floatrange:
- floatrange generate values when needed, like range.
- floatrange has a precision parameter
precto deal with inaccurate floating point computation. - floatrange is a pure Python module.
And searching for Python float range, or frange will give you other solutions (see also comments on these solutions when available).
