Как найти количество байт в слове

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I need to know the number of bytes in a ‘word’ in Python. The reason I need this is I have the number of words I need to read from a file; if I knew the number of bytes in a word, I can use the file.read(num_bytes) function to read the appropriate amount from the file.

How can I determine the number of bytes in a word?

There is no concept of ‘word’ in Python, when you read binary data from a file, you can state explicitly, how many bytes should be read at a time.

In terms of compiler and/or platform, ‘WORD’ generally determines a size of a basic data unit. And Python is independent from that kind of stuff 🙂

answered Aug 2, 2011 at 20:44

There’s no really sound definition for what a word is; except that certain archetectures call some number of bytes ‘word’ (x86 calls 2 bytes a word, PPC calls 4 bytes a word), but there’s not much significance besides this arbitrary value.

Perhaps the simplest solution is to just defer to the struct module; for instance, the format 'h' means signed short (which reasonably agrees with the intel definition of ‘word’). So you could do this:

>>> import struct
>>> f = file('.vimrc')
>>> struct.unpack('h', f.read(struct.calcsize('h')))
(8226,)
>>> 

answered Aug 2, 2011 at 20:45

I need to know the number of bytes in a ‘word’ in Python. The reason I
need this is I have the number of words I need to read from a file

Then you need to ask the person who wrote the file. It has nothing to do with Python and everything to do with what the actual file format is. It’s pretty odd for a file to be defined as a sequence of words BTW. It is most probably a sequence of 16- or 32-bit integers, or else it really is words in the text sense, in which case you are really scanning the file for tokens between whatever the delimiters are.

answered Aug 3, 2011 at 0:03

How about something like this:

def machine_word_size():
    import sys
    num_bytes = 0
    maxint = sys.maxint
    while maxint > 0:
        maxint = maxint >> 8
        num_bytes += 1
    return num_bytes

answered Apr 17, 2013 at 6:58

answered May 21, 2017 at 22:51