/Python/Add new column based on condition on some other column in pandas.

Add new column based on condition on some other column in pandas.

# np.where(condition, value if condition is true, value if condition is false)

df['hasimage'] = np.where(df['photos']!= '[]', True, False)
df.head()

Source: dataquest.io

Pandas create new column conditional on other columns

# For creating new column with multiple conditions
conditions = [
    (df['Base Column 1'] == 'A') & (df['Base Column 2'] == 'B'),
    (df['Base Column 3'] == 'C')]
choices = ['Conditional Value 1', 'Conditional Value 2']
df['New Column'] = np.select(conditions, choices, default='Conditional Value 1')

Pandas create a new column based on condition of two columns

conditions = [
    df['gender'].eq('male') & df['pet1'].eq(df['pet2']),
    df['gender'].eq('female') & df['pet1'].isin(['cat', 'dog'])
]

choices = [5,5]

df['points'] = np.select(conditions, choices, default=0)

print(df)
     gender      pet1      pet2  points
0      male       dog       dog       5
1      male       cat       cat       5
2      male       dog       cat       0
3    female       cat  squirrel       5
4    female       dog       dog       5
5    female  squirrel       cat       0
6  squirrel       dog       cat       0

Source: stackoverflow.com

Similar codes

3 votes233 views10 answers
Rick roll
Python
-4 votes216 views5 answers
Current django version
Python
5 votes221 views1 answer
Make linked list in python
Python
5 votes302 views2 answers
Append element an array in python
Python
-1 vote230 views1 answer
Dataframe partition dataset based on column
Python
9 votes210 views6 answers
Pattern python
Python
0 vote227 views1 answer
Django get current user in form
Python
0 vote231 views1 answer
How to use for loop to take n number of input in python
Python
1 vote202 views1 answer
Pygame alien example
Python
17 votes237 views6 answers
Odd or even in python
Python