circuitpython/tests/io/file_readinto.py

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b = bytearray(30)
f = open("data/file1", "rb")
print(f.readinto(b))
print(b)
f = open("data/file2", "rb")
print(f.readinto(b))
print(b)
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# readinto() on writable file
f = open("data/file1", "ab")
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try:
f.readinto(bytearray(4))
except OSError:
print("OSError")