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f = open("data/file1", "rb")
print(f.seek(6))
print(f.read(5))
print(f.tell())
print(f.seek(0, 1))
print(f.read(4))
print(f.tell())
print(f.seek(-6, 2))
print(f.read(20))
print(f.tell())
print(f.seek(0, 0))
print(f.read(5))
print(f.tell())
f.close()
# test text mode
f = open("data/file1", "rt")
print(f.seek(6))
print(f.read(5))
print(f.tell())
f.close()
# seek closed file
f = open("data/file1", "r")
f.close()
try:
f.seek(1)
except (OSError, ValueError):
# CPy raises ValueError, uPy raises OSError
print("OSError or ValueError")
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