Sorry :) Pandas is undisputed king. But there were multiple bindings from Python into R available in the early 2000's. Some like rpy and rpy2 are still around,

Sorry :) Pandas is undisputed king. But there were multiple bindings from Python into R available in the early 2000's. Some like rpy and rpy2 are still around, others are long defunct. I concede that these weren't standalone dataframe libraries, but rather dataframe features built into a language binding.