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Which of these correctly opens a file for reading and guarantees it is closed?

A f = open('data.txt'); f.read()
B with open('data.txt') as f: f.read()
C file = read('data.txt')
D open('data.txt').close()

Answer

with open('data.txt') as f: f.read()

The with statement closes the file even if an exception occurs inside the block, which manual open and close does not guarantee.

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