Get Gzip-compressed data on-memory

You can use gzip.GzipFile to perform Gzip compression with Python code, but if you do it normally, it will be output to a file. Use StringIO.StringIO(file-like object) to collect the output Gzip-compressed data.

↓ is done on Mac OS 10.10.1, Python2.7.11, utf-8. If the encoding etc. is different, the result will be slightly different.

Get compressed

>>> from gzip import GzipFile
>>> from StringIO import StringIO

>>> io = StringIO()

>>> with GzipFile(fileobj=io, mode='wb') as f:
...     f.write('Data 1')
...     f.write('Data 2')
...     f.write('Data 3')

>>> io.getvalue()
'\x1f\x8b\x08\x00JM\rX\x02\xff{\xdc\xdc\xfe\xb8y\xcf\xe3\xa6\xfd\xef\xf7L|\x8c`OBbO\x06\x00\xb9M\x7f\xca$\x00\x00\x00'

(Bonus) Try to unzip

>>> io = StringIO()
>>> io.write('\x1f\x8b\x08\x00JM\rX\x02\xff{\xdc\xdc\xfe\xb8y\xcf\xe3\xa6\xfd\xef\xf7L|\x8c`OBbO\x06\x00\xb9M\x7f\xca$\x00\x00\x00')
>>> io.seek(0)

>>> with GzipFile(fileobj=io, mode='rb') as f:
...     print f.read()

Data 1 Data 2 Data 3