Petr Viktorin
2016-01-08 23:31:19
It's used when you have some API that only takes files, but you need to use a string. For example, to compress a string using the gzip module in Python 2:
import gzip
import StringIO
stringio = StringIO.StringIO()
gzip_file = gzip.GzipFile(fileobj=stringio, mode='w')
gzip_file.write('Hello World')
gzip_file.close()
stringio.getvalue()
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in other words:
duck typing:DSince Python 3.2, the gzip module has functions compress data directly. (But any well-known open-source library that currently needs StringIO will probably grow such functions after some time, so rather than search for a new example I'll leave gzip here.)