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import os
if not hasattr(os, "remove"):
print("SKIP")
raise SystemExit
# cleanup in case testfile exists
try:
os.remove("testfile")
except OSError:
pass
try:
f = open("testfile", "r+b")
print("Unexpectedly opened non-existing file")
except OSError:
print("Expected OSError")
pass
f = open("testfile", "w+b")
f.write(b"1234567890")
f.seek(0)
print(f.read())
f.close()
# Open with truncation
f = open("testfile", "w+b")
f.write(b"abcdefg")
f.seek(0)
print(f.read())
f.close()
# Open without truncation
f = open("testfile", "r+b")
f.write(b"1234")
f.seek(0)
print(f.read())
f.close()
# cleanup
try:
os.remove("testfile")
except OSError:
pass
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