Convert list of ASCII codes to string byte array in Python

Question

I have a list of integer ASCII values that I need to transform into a string  binary  to use as the key for a crypto operation   I am re-implementing java crypto code in python   This works  assuming an 8-byte key    key   struct pack  BBBBBBBB   17  24  121  1  12  222  34  76    However  I would prefer to not have the key length and unpack   parameter list hardcoded   How might I implement this correctly  given an initial list of integers   Thanks

User · Answer

For Python 2 6 and later if you are dealing with bytes then a bytearray is the most obvious choice    gt  gt  gt  str bytearray  17  24  121  1  12  222  34  76      x11 x18y x01 x0c xde L    To me this is even more direct than Alex Martelli s answer - still no string manipulation or len call but now you don t even need to import anything

User · Answer

I much prefer the array module to the struct module for this kind of tasks  ones involving sequences of homogeneous values     gt  gt  gt  import array  gt  gt  gt  array array  B    17  24  121  1  12  222  34  76   tostring     x11 x18y x01 x0c xde L    no len call  no string manipulation needed  etc -- fast  simple  direct  why prefer any other approach

User · Answer

Shorter version of previous using map   function  works for python 2 7       join map chr  myList

User · Answer

struct pack  B    len integers    integers     sequence means  unpack sequence  - or rather   when calling f       args        let args   sequence

User · Answer

This is reviving an old question  but in Python 3  you can just use bytes directly    gt  gt  gt  bytes  17  24  121  1  12  222  34  76   b  x11 x18y x01 x0c xde L

User · Answer

key      join  chr  val   for val in myList

[python] Convert list of ASCII codes to string (byte array) in Python

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