Avoid mutable default arguments and enforce utf-8 #3
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Using mutable default arguments produces errors when creating multiple instances of the class.
Encoding="utf-8" should be enforced, otherwise the script fails in environments with a non-standard command line locale.
Google outputs results in utf-8.
The UTF-8 encoding of the resulting file was already specified in the tag. Hence, Python 3 should always output a utf-8 file.