python create file

What is the best way to open a file as read/write if it exists, or if it does not, then create it and open it as read/write? From what I read, file = open('myfile.dat', 'rw') should do this ...

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Python是一款簡單強大又好用的動態語言,在國外已經流行了十幾年。Python擁有更高的時效性,可以讓您的開發週期更短,並讓您的生產力提升。 簡單易學,並有內建的各種現成的模組 ...

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    https://mail.python.org
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    http://www.pythonforbeginners.
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    https://en.wikibooks.org
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    http://xlsxwriter.readthedocs.