micropython/tests/io/open_append.py

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try:
import uos as os
except ImportError:
import os
if not hasattr(os, "unlink"):
print("SKIP")
raise SystemExit
# cleanup in case testfile exists
try:
os.unlink("testfile")
except OSError:
pass
# Should create a file
f = open("testfile", "a")
f.write("foo")
f.close()
f = open("testfile")
print(f.read())
f.close()
f = open("testfile", "a")
f.write("bar")
f.close()
f = open("testfile")
print(f.read())
f.close()
# cleanup
try:
os.unlink("testfile")
except OSError:
pass