["python","floating-point","range"]
How do I use a decimal step value for range()?

How do I iterate between 0 and 1 by a step of 0.1? This says that the step argument cannot be zero: for i in range(0, 1, 0.1): print(i)
Rather than using a decimal step directly, it's much safer to express this in terms of how many points you want. Otherwise, floating-point rounding error is likely to give you a wrong result. Use the linspace function from the NumPy library (which isn't part of the standard library but is relatively easy to obtain). linspace takes a number of points to return, and also lets you specify whether or not to include the right endpoint: >>> np.linspace(0,1,11) array([ 0. , 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1. ]) >>> np.linspace(0,1,10,endpoint=False) array([ 0. , 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9]) If you really want to use a floating-point step value, use numpy.arange: >>> import numpy as np >>> np.arange(0.0, 1.0, 0.1) array([ 0. , 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9]) Floating-point rounding error will cause problems, though. Here's a simple case where rounding error causes arange to produce a length-4 array when it should only produce 3 numbers: >>> numpy.arange(1, 1.3, 0.1) array([1. , 1.1, 1.2, 1.3])