How to use 'pandas ffill' in Python

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114def panel_fillna(panel, type="bfill"):
115 """
116 fill nan along the 3rd axis
117 :param panel: the panel to be filled
118 :param type: bfill or ffill
119 """
120 frames = {}
121 for item in panel.items:
122 if type == "both":
123 frames[item] = panel.loc[item].fillna(axis=1, method="bfill").\
124 fillna(axis=1, method="ffill")
125 else:
126 frames[item] = panel.loc[item].fillna(axis=1, method=type)
127 return pd.Panel(frames)
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