What's the equivalent of `array.array('c')` in python 3

Question

My old code with python 2 has

import array

buf = array.array('c')

In python 3, this chunk of code gives error

E ValueError: bad typecode (must be b, B, u, h, H, i, I, l, L, q, Q, f or d)

What would be the equivalent in python 3? How to make the code work for both python 2 and 3?

Are you looking for this: stackoverflow.com/questions/37142319/… ? Also, have you tried 2to3? — Dan
– Dan, Commented Dec 13, 2017 at 18:34

Pavel · Accepted Answer · 2017-12-13 18:31:40Z

0

Just check the manual: https://docs.python.org/3/library/array.html

'b' signed char
'B' unsigned char

So you'll probably need B (but we can't be sure - it depends on the rest of your code, I guess). This is also compatible with Python 2.x.

answered Dec 13, 2017 at 18:31

Pavel

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1 Comment

DavidW Over a year ago

Probably worth noting that the C char can be either signed or unsigned (the standard doesn't specify). I imagine c matches whatever the C compiler used to build Python was. Therefore it could match either b or B. It's probably better to specify it anyway.

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