[Python] Numpy float64 vs Python float

I'm battling some floating point problems in Pandas read_csv function. In my investigation, I found this:

In [15]: a = 5.9975

In [16]: a
Out[16]: 5.9975

In [17]: np.float64(a)
Out[17]: 5.9974999999999996


Why is builtin float of Python and the np.float64 type from Python giving different results? I thought they were both C++ doubles?

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