double square brackets not required #3
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We do not need the double square brackets. I have replicated this function and can see similar results of:
.join(df2[[df2_key, df2_value]], df1[df1_key] == df2[df2_key], 'left')
and
.join(df2[df2_key, df2_value], df1[df1_key] == df2[df2_key], 'left').