check if column exists in dataframe
if 'A' in df.columns:
check if column exists in dataframe
if 'A' in df.columns:
make a condition statement on column pandas
df['color'] = ['red' if x == 'Z' else 'green' for x in df['Set']]
check if column exists in dataframe python
if 'A' in df:
if condition dataframe python
df.loc[df['age1'] - df['age2'] > 0, 'diff'] = df['age1'] - df['age2']
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