cpython/Lib/test/test_gzip.py

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import sys, os
import gzip, tempfile
filename = tempfile.mktemp()
data1 = """ int length=DEFAULTALLOC, err = Z_OK;
PyObject *RetVal;
int flushmode = Z_FINISH;
unsigned long start_total_out;
"""
data2 = """/* zlibmodule.c -- gzip-compatible data compression */
/* See http://www.cdrom.com/pub/infozip/zlib/ */
/* See http://www.winimage.com/zLibDll for Windows */
"""
f = gzip.GzipFile(filename, 'wb') ; f.write(data1) ; f.close()
f = gzip.GzipFile(filename, 'rb') ; d = f.read() ; f.close()
assert d == data1
# Append to the previous file
f = gzip.GzipFile(filename, 'ab') ; f.write(data2) ; f.close()
f = gzip.GzipFile(filename, 'rb') ; d = f.read() ; f.close()
assert d == data1+data2
os.unlink( filename )