numpy.core.defchararray.isdecimal (arr) returns True for each item if there are only decimal characters in the item. Returns false otherwise.
arr: array_like of str or unicode.
Returns: [ndarray] Output array of bools.
Code # 1:
Input array: [`1000`` 2000`] Output array : [True True]
Code # 2:
Input ar ray: [`1000 2`` a1000` `1234 ab`] Output array: [False False False]
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