[python] How to read first N lines of a file?

Starting at Python 2.6, you can take advantage of more sophisticated functions in the IO base clase. So the top rated answer above can be rewritten as:

    with open("datafile") as myfile:
       head = myfile.readlines(N)
    print head

(You don't have to worry about your file having less than N lines since no StopIteration exception is thrown.)

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