numpy.dtype.kind

dtype.kind

A character code (one of ‘biufcmMOSUV’) identifying the general kind of data.

b boolean
i signed integer
u unsigned integer
f floating-point
c complex floating-point
m timedelta
M datetime
O object
S (byte-)string
U Unicode
V void

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Licensed under the 3-clause BSD License.
https://docs.scipy.org/doc/numpy-1.14.5/reference/generated/numpy.dtype.kind.html