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open_plus.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

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.unlink("testfile")

except OSError:

pass