df compare pl

compares two polars dataframes for equality
equality in this case means that:

both dfs must have the same columns: column names, dtypes, number of cols
both dfs must have the same rows
if the dfs have different columns they will not be checked for a difference in rows
row and column order do not matter for row and column comparisons

args:
a: a pl.Dataframe
b: a pl.Dataframe
col_only: a boolean indicating whether only the columns should be checked
write_csv: a boolean indicating whether or not to write csvs with the row differences, this is helpful when there are many row differences and the normal prints won't contain everything; defaults to False

returns:
True if the dataframes are equal, False if not
prints the difference if False

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