Si la condición DataFrame Python
df.loc[df['age1'] - df['age2'] > 0, 'diff'] = df['age1'] - df['age2']
Glorious Goldfinch
df.loc[df['age1'] - df['age2'] > 0, 'diff'] = df['age1'] - df['age2']import pandas as pd
numbers = {'set_of_numbers': [1,2,3,4,5,6,7,8,9,10]}
df = pd.DataFrame(numbers,columns=['set_of_numbers'])
df.loc[df['set_of_numbers'] <= 4, 'equal_or_lower_than_4?'] = 'True'
df.loc[df['set_of_numbers'] > 4, 'equal_or_lower_than_4?'] = 'False'
print (df)