gli

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Describe the bug

When I tried to add some str type date into Node Attributes, I found that Attribute class fails to automatically detect the data format of the data. Though adding data_type='str' would work, it's more user-friendly to completely implement the data format detection function.

To Reproduce

follow codes below:

# BUG example
from gli.io import save_graph, Attribute
import numpy as np 
a = Attribute("date", np.array(["Mon", "Tue", "Wed"]), "date", data_type="str") # worked
print(a) 
a = Attribute("date", np.array(["Mon", "Tue", "Wed"]), "date") # failed without data_type="str"
#FIXME - NotImplementedError: memoryview: unsupported format 3w

Expected behavior I think even without data_type="str", this function should work properly.

Screenshots