f = open('non_existing_file', 'w'): In write mode ('w'), if the file doesn't exist, it's created. This line succeeds.
print(1, end=' '): Executes. Output: 1
s = f.readline(): Reading from a newly created/empty file (opened in 'w' mode) returns an empty string, ''. No error.
print(2, end=' '): Executes. Output: 1 2
No IOError occurred, so the except IOError block is skipped. print(3, end=' ') is NOT executed.
The else block executes.
f.close(): The file is closed.
print(4, end=' '): Executes. Output: 1 2 4
Therefore, the final output is 1 2 4.
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Abbribas
1 month, 2 weeks ago