circuitpython/tests/io/file_with.py

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f = open("io/data/file1")
with f as f2:
print(f2.read())
# File should be closed
try:
f.read()
except:
# Note: CPython and us throw different exception trying to read from
# close file.
print("can't read file after with")
# Regression test: test that exception in with initialization properly
# thrown and doesn't crash.
try:
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with open("__non_existent", "r"):
pass
except OSError:
print("OSError")