data-prep.py (specify encoder in open statements)

[nikohartline]

When the default encoder is not set to utf8, the data-prep.py code errors out. Might help for future classes to have the option specified.

with open("train.csv", "w") as f:

change to:

with open("train.csv", "w",encoding="utf8") as f:

note that there are 6 instances of open where adding the encoding statement should help!

Lines with issue:

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