標準錯誤流
# Error messages should not go to standard output, if possible.
print('ERROR: We have no cheese at all.', file=sys.stderr)
try:
f = open('nonexistent-file.xyz', 'rb')
except OSError as e:
print(e, file=sys.stderr)
# Error messages should not go to standard output, if possible.
print('ERROR: We have no cheese at all.', file=sys.stderr)
try:
f = open('nonexistent-file.xyz', 'rb')
except OSError as e:
print(e, file=sys.stderr)