Assuming that the open() invocation has gone successfully, the following snippet: for x in open(‘file’, ‘rt’): print(x) will:

for x in open('file', 'rt'):
    print(x)

will:

• read the whole file at once
• cause an exception
• read the file character by character
• read the file line by line

Explanation: The open() method returns an iterable object which can be used to iterate through all the file’s lines inside a for loop, and the stream closes itself automatically when it reaches the end of the file.

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