/Python/Pandas create column from another column

Pandas create column from another column

# Creates a new column 'blue_yn' based on the existing 'color' column
# If the 'color' column value is 'blue' then the new column value is 'YES'
df['blue_yn'] = np.where(df['color'] == 'blue', 'YES', 'NO')
# Can also do this using .apply and a lambda function
df['blue_yn']= df['color'].apply(lambda x: 'YES' if (x == 'blue') else 'NO')

Create new columns pandas from another column

def label_race (row):
   if row['eri_hispanic'] == 1 :
      return 'Hispanic'
   if row['eri_afr_amer'] + row['eri_asian'] + row['eri_hawaiian'] + row['eri_nat_amer'] + row['eri_white'] > 1 :
      return 'Two Or More'
   if row['eri_nat_amer'] == 1 :
      return 'A/I AK Native'
   if row['eri_asian'] == 1:
      return 'Asian'
   if row['eri_afr_amer']  == 1:
      return 'Black/AA'
   if row['eri_hawaiian'] == 1:
      return 'Haw/Pac Isl.'
   if row['eri_white'] == 1:
      return 'White'
   return 'Other'

df.apply(lambda row: label_race(row), axis=1)

Source: stackoverflow.com

Similar codes

-2 votes284 views1 answer
Is coding fun?
Python
0 vote303 views1 answer
Doormat pattern
Python
105 votes357 views6 answers
Python json to dict
Python
-1 vote269 views2 answers
Decimal to octal in python
Python
1 vote275 views2 answers
Isalnum
Python
3 votes306 views2 answers
Set Intersection
Python
0 vote257 views1 answer
Python read binary
Python
0 vote266 views1 answer
Python bufferedreader
Python
0 vote288 views2 answers
Groupby and sort python
Python
0 vote269 views1 answer
Countvectorizer remove stop words
Python