Convert bytes to int

Question

I m currently working on an encryption decryption program and I need to be able to convert bytes to an integer  I know that   bytes  3     b  x03    Yet I cannot find out how to do the inverse  What am I doing terribly wrong

User · Answer

Lists of bytes are subscriptable  at least in Python 3 6   This way you can retrieve the decimal value of each byte individually    gt  gt  gt  intlist    64  4  26  163  255   gt  gt  gt  bytelist   bytes intlist          b  x04 x1a xa3 xff    gt  gt  gt  for b in bytelist         print b                        64  4  26  163  255   gt  gt  gt   b for b in bytelist               64  4  26  163  255    gt  gt  gt  bytelist 2                        26

User · Answer

int from bytes  bytes  byteorder     signed False     doesn t work with me  I used function from this website  it works well  https   coderwall com p x6xtxq convert-bytes-to-int-or-int-to-bytes-in-python  def bytes to int bytes       result   0     for b in bytes          result   result   256   int b      return result  def int to bytes value  length       result          for i in range 0  length           result append value  gt  gt   i   8   amp  0xff      result reverse       return result

User · Answer

Assuming you re on at least 3 2  there s a built in for this       int from bytes  bytes  byteorder     signed False                 The argument bytes must either be a bytes-like object or an iterable   producing bytes       The byteorder argument determines the byte order used to represent the   integer  If byteorder is  big   the most significant byte is at the   beginning of the byte array  If byteorder is  little   the most   significant byte is at the end of the byte array  To request the   native byte order of the host system  use sys byteorder as the byte   order value       The signed argument indicates whether two   s complement is used to   represent the integer         Examples  int from bytes b  x00 x01    big                             1 int from bytes b  x00 x01    little                          256  int from bytes b  x00 x10   byteorder  little                4096 int from bytes b  xfc x00   byteorder  big   signed True    -1024

[python] Convert bytes to int?

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