/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 vote273 views1 answer
Python calculated row in dataframe subtract
Python
0 vote220 views1 answer
First rows of data frame (specify n by param)
Python
1 vote260 views1 answer
Python ascii caesar cipher
Python
0 vote286 views1 answer
Get data from s3 bucket python
Python
16 votes273 views2 answers
Python reload class
Python
1 vote270 views2 answers
Speech enhancement techniques
Python
3 votes271 views3 answers
Pandas sum group by
Python
6 votes269 views1 answer
Enter key press bind tkinter
Python
4 votes280 views3 answers
** in python
Python
17 votes294 views6 answers
Odd or even in python
Python