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我有以下形式的數據幀：如何通過索引的開始來過濾熊貓數據框？
code note
OH2014 Oats Futures, March 2014, OH2014, CBOT
HGG2004 Copper Futures, February 2004, HGG2004, COMEX
BRH2014 Brazilian Real (BRL/USD) Futures, March 2014, ...
F5H2014 PJM PPL Zone Off-Peak Calendar-Month Day-Ahead...
PDMU2016 MISO Indiana Hub Day-Ahead Peak Calendar-Month...
GLG2015 Columbia Gulf Louisiana Natural Gas (Platts IF...
SSIZ2014 Coal (API 8) cfr South China (Argus/McCloskey)...
KCU1997 Coffee Futures, September 1997, KCU1997, ICE
FVH2003 5 Year Treasury Note Futures, March 2003, FVH2...
BOK1974 Soybean Oil Futures, May 1974, BOK1974, CBOT
其中的代碼是一個指數。
如何過濾只返回代碼以'OH'開始的條目？