How to read a file byte by byte in Python and how to print a bytelist as a binary

Question

I m trying to read a file byte by byte  but I m not sure how to do that  I m trying to do it like that   file   open filename   rb   while 1     byte   file read 8       Do something      So does that make the variable byte to contain 8 next bits at the beginning of every loop  It doesn t matter what those bytes really are  The only thing that matters is that I need to read a file in 8-bit stacks   EDIT   Also I collect those bytes in a list and I would like to print them so that they don t print out as ASCII characters  but as raw bytes i e  when I print that bytelist it gives the result as    10010101    00011100

User · Answer

Late to the party  but this may help anyone looking for a quick solution   you can use bin ord  b    replace  b      bin   it gives you the binary representation with a  b  after the last bit  you have to remove it  Also ord   gives you the ASCII number to the char or 8-bit 1 Byte coded character   Cheers

User · Answer

There s a python module especially made for reading and writing to and from binary encoded data called  struct   Since versions of Python under 2 6 doesn t support str format  a custom method needs to be used to create binary formatted strings   import struct    binary string def bstr n     n in range 0-255     return    join  str n  gt  gt  x  amp  1  for x in  7 6 5 4 3 2 1 0       read file into an array of binary formatted strings  def read binary path       f   open path  rb       binlist          while True          bin   struct unpack  B  f read 1   0    B stands for unsigned char  8 bits          if not bin              break         strBin   bstr bin          binlist append strBin      return binlist

User · Answer

To answer the second part of your question  to convert to binary you can use a format string and the ord function    gt  gt  gt  byte    a   gt  gt  gt    0 08b   format ord byte    01100001    Note that the format pads with the right number of leading zeros  which seems to be your requirement  This method needs Python 2 6 or later

User · Answer

To read one byte   file read 1    8 bits is one byte

User · Answer

The code you ve shown will read 8 bytes  You could use  with open filename   rb   as f     while 1        byte s   f read 1        if not byte s           break       byte   byte s 0

[python] How to read a file byte by byte in Python and how to print a bytelist as a binary?

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