CODEWITHSUNDEEP
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Jeff Thompson
Jeff Thompson

Reputation: 96

Make memoryview of bytearray return int elements in Python 2.7

b = bytearray(1)
m = memoryview(b)

Since the type(b[0]) is int, I would expect type(m[0]) to be int also. Starting in Python 3.2 this is true. But in Python 2.7, the type is str. I need to be able to pass a memoryview to functions which expect an array of int.

In Python 2.7, I could create a wrapper class and override __getitem__ . But is there a trick to tell a memoryview object to return int elements?

Upvotes: 4

Views: 1696

Answers (2)

warvariuc
warvariuc

Reputation: 59594

Using ord should do the trick:

Python 2.7.5+ (default, Sep 19 2013, 13:48:49) 
>>> b = bytearray(1)
>>> m = memoryview(b)
>>> m[0]
'\x00'
>>> ord(m[0])
0
>>> map(ord, m)
[0]
>>>

This is because in Python 2 byte data is stored in strings. Python 3 now distinguishes bytes and strings (unicode).

Upvotes: 1

Alex Gaynor
Alex Gaynor

Reputation: 14999

No, there's no way to cause memoryview's __getitem__ to return int objects.

Upvotes: 1

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