Convert from '_io.BytesIO' to a bytes-like object in python3.6?

python python-3.x typeerror zlib bytesio
Dan picture Dan · Jan 10, 2019 · Viewed 23.3k times · Source

I am using this function to uncompress the body or a HTTP response if it is compressed with gzip, compress or deflate.

def uncompress_body(self, compression_type, body):
    if compression_type == 'gzip' or compression_type == 'compress':
        return zlib.decompress(body)
    elif compression_type == 'deflate':
        compressor = zlib.compressobj(9, zlib.DEFLATED, -zlib.MAX_WBITS)
        compressed = compressor.compress(body)
        compressed += compressor.flush()
        return base64.b64encode(compressed)

    return body

However python throws this error message.

TypeError: a bytes-like object is required, not '_io.BytesIO'

on this line:

return zlib.decompress(body)

Essentially, how do I convert from '_io.BytesIO' to a bytes-like object?

Answer

wim picture wim · Jan 10, 2019

It's a file-like object. Read them:

>>> b = io.BytesIO(b'hello')
>>> b.read()
b'hello'

If the data coming in from body is too large to read into memory, you'll want to refactor your code and use zlib.decompressobj instead of zlib.decompress.

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