python - Determine indices of entries in an array that start with a certain string -


how can determine indices of elements in numpy array start string (e.g. using startswith)?

example

array:

test1234 testworld hello mynewcar test5678

now need indices value starts test. desired outcome is:

[0,1,4]

@divakar's answer way go, alternative, can use list comprehension:

a = np.array(['test1234', 'testworld', 'hello', 'mynewcar', 'test5678'])  [i i, si in enumerate(a) if si.startswith('test')]

will give

[0, 1, 4]

this list convert numpy array:

np.array([i i, si in enumerate(a) if si.startswith('test')])

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