PYTHON

make a condition statement on column pandas

df['color'] = ['red' if x == 'Z' else 'green' for x in df['Set']]

make a condition statement on column pandas

df.loc[df['column name'] condition, 'new column name'] = 'value if condition is met'

if condition dataframe python

df.loc[df['age1'] - df['age2'] > 0, 'diff'] = df['age1'] - df['age2']

Python | Creating a Pandas dataframe column based on a given condition

# importing pandas as pd
import pandas as pd
  
# Creating the dataframe
df = pd.DataFrame({'Date' : ['11/8/2011', '11/9/2011', '11/10/2011',
                                        '11/11/2011', '11/12/2011'],
                'Event' : ['Music', 'Poetry', 'Music', 'Music', 'Poetry']})
  
# Print the dataframe
print(df)