io - Python runs but won't write to file -

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i want print variable file word_filter_output.txt. code runs fine , variable e prints console if want not print file. no errors come up. file left 0 bytes.

>>>with open("word_filter_output.txt", "w") f: >>>    print(e, file = f)

it works given me (python 3.3.4);

depending on else doing, may need force-flush it, ie

with open("word_filter_output.txt", "w") f:     print(e, file=f, flush=true)

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