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Pandas if nan, then the row above

Pandas replace null values with values from another column

#Python
#Col 1 = where you want the values replaced
#Col 2 = where you want to take the values from
df["Col 1"].fillna(df["Col 2"], inplace=True)

2

Source: stackoverflow.com

Pandas if nan, then the row above

df.fillna(method='ffill')

0

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