python 位数组与文件之间的转换

发布于 2024-11-14 07:03:41 字数 399 浏览 3 评论 0原文

我正在使用以下代码将一个大位数组写入文件：

import bitarray
bits = bitarray.bitarray(bin='0000011111') #just an example

with open('somefile.bin', 'wb') as fh:
    bits.tofile(fh)

但是，当我尝试使用以下方法读回此数据时：

import bitarray
a = bitarray.bitarray()
with open('somefile.bin', 'rb') as fh:
    bits = a.fromfile(fh)
    print bits

它失败，“位”是 NoneType。我做错了什么？

原文

I'm writing a large bitarray to a file using this code:

import bitarray
bits = bitarray.bitarray(bin='0000011111') #just an example

with open('somefile.bin', 'wb') as fh:
    bits.tofile(fh)

However, when i attempt to read this data back using:

import bitarray
a = bitarray.bitarray()
with open('somefile.bin', 'rb') as fh:
    bits = a.fromfile(fh)
    print bits

it fails with 'bits' being a NoneType. What am i doing wrong?

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原谅我要高飞 2024-11-21 07:03:41

我认为“a”就是你想要的。 a.fromfile(fh) 是一种用 fh 的内容填充 a 的方法：它不返回位数组。

>>> import bitarray
>>> bits = bitarray.bitarray('0000011111')
>>> 
>>> print bits
bitarray('0000011111')
>>> 
>>> with open('somefile.bin', 'wb') as fh:
...     bits.tofile(fh)
... 
>>> a = bitarray.bitarray()
>>> with open('somefile.bin', 'rb') as fh:
...     a.fromfile(fh)
... 
>>> print a
bitarray('0000011111000000')

I think "a" is what you want. a.fromfile(fh) is a method which fills a with the contents of fh: it doesn't return a bitarray.

>>> import bitarray
>>> bits = bitarray.bitarray('0000011111')
>>> 
>>> print bits
bitarray('0000011111')
>>> 
>>> with open('somefile.bin', 'wb') as fh:
...     bits.tofile(fh)
... 
>>> a = bitarray.bitarray()
>>> with open('somefile.bin', 'rb') as fh:
...     a.fromfile(fh)
... 
>>> print a
bitarray('0000011111000000')

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