How to convert bytes in a string to integers? Python

Question

I want to get a list of ints representing the bytes in a string.

Answer 1

Do you mean the ascii values?

nums = [ord(c) for c in mystring]

or

nums = []
for chr in mystring:
    nums.append(ord(chr))

Answer 2

One option for Python 2.6 and later is to use a bytearray:

>>> b = bytearray('hello')
>>> b[0]
104
>>> b[1]
101
>>> list(b)
[104, 101, 108, 108, 111]

For Python 3.x you'd need a bytes object rather than a string in any case and so could just do this:

>>> b = b'hello'
>>> list(b)
[104, 101, 108, 108, 111]

Answer 3

Perhaps you mean a string of bytes, for example received over the net, representing a couple of integer values?

In that case you can "unpack" the string into the integer values by using unpack() and specifying "i" for integer as the format string.

See: http://docs.python.org/library/struct.html