Original ticket http://projects.scipy.org/numpy/ticket/1195 on 2009-08-17 by trac user dgoldsmith, assigned to unknown.

Example:

c = np.array(['aAaAaA', ' aA ', 'abBABba']).view(np.chararray)
c
chararray(['aAaAaA', ' aA', 'abBABba'],
dtype='|S7')
c.count('aA', end=3)
array([3, 1, 0]

Problem (as reported by Pierre GM):

"The input of the method ('aA',start,end) are checked for consistency.
However, a problem is that as soon any value is 0 or None or False,
the following values are not checked and just discarded (that's line 171 in defchararray).
When you call the count method, start defaults to None, meaning
that the end parameter is never taken into account.

"That's clearly a bug, actually 2 bugs:

• start should default to 0 in that case (you need it in the count
  method of strings)
• when one of the parameter is not None, it should be taken into
  account.

">>> if not chk or (chk.dtype is object_ and chk.item() is None):
should become

if (chk is None) of (chk.dtype is object_ and chk.item() is None):"