Simple trick to read mixed format data with numpy’s genfromtxt

Suppose your data is like the following


Let’s load it with numpy using genfromtxt

expdata=np.genfromtxt(fname, delimiter=',',skip_header=1,usecols=[0,1,2,3,4])

print expdata[0]
print expdata[-1]

This prints the following

[  3.00000000e+01   5.00000000e+00   2.01500000e+03   2.00000000e+00             NaN]
[   30.     5.  2015.    50.    NaN]

Numeric data is read but not quite as what we wanted. Notice the NaN.

You can supply genfromtxt the datatypes using the keyword format like

dtype=([(‘f0’, ‘<i4’), (‘f1’, ‘<i4’), (‘f2’, ‘<i4’), (‘f3’, ‘<f8’), (‘f4’, ‘|S14’)])

expdata=np.genfromtxt(fname, delimiter=',',skip_header=1,usecols=[0,1,2,3,4],dtype=([('f0', '&amp;amp;lt;i4'), ('f1', '&amp;amp;lt;i4'), ('f2', '&amp;amp;lt;i4'), ('f3', '&amp;amp;lt;f8'), ('f4', '|S14')]))

(30, 5, 2015, 2.0, 'TRAVEL')
(30, 5, 2015, 50.0, 'TRAVEL')

But that looks too much work but there’s a simple smart way to do this. Use dtype=None


expdata=np.genfromtxt(fname, delimiter=',',skip_header=1,usecols=[0,1,2,3,4],dtype=None)

(30, 5, 2015, 2.0, 'TRAVEL')
(30, 5, 2015, 50.0, 'TRAVEL')

Using dtype=None is a good trick if you don’t know what your columns should be and you need some help in getting the format. This might be slower but it does work and once you have the data you can replace the dtype none with the appropriate arguments.

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