;) In [29]: s = 'bannab'
In [30]: a = np.frombuffer(s.lower(), dtype='uint8') In [31]: np.all(a == a[::-1]) Out[31]: True In [32]: s = 'bannac' In [33]: a = np.frombuffer(s.lower(), dtype='uint8') In [34]: np.all(a == a[::-1]) Out[34]: False
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