/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

0 vote136 views1 answer
How to get parent model object based on child model filter in django
Python Django
0 vote150 views1 answer
Aws lambda logging with python logging library
Python
0 vote145 views1 answer
Connectionrefusederror at /accounts/signup/ django allauth
Python Django
10 votes126 views1 answer
Pandas select by column value
Python
0 vote122 views1 answer
One function in numpy array
Python
0 vote103 views1 answer
How to close a webpage using selenium driver python
Python
0 vote105 views1 answer
Delete column matlab
Python
0 vote121 views1 answer
Django send_mail not working in testcase
Python
2 votes126 views1 answer
Resampling data python
Python
3 votes115 views1 answer
Numpy factorial
Python