/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

0 vote196 views1 answer
Get n largest values from 2D numpy array matrix
Python
4 votes166 views1 answer
Making a function wait in python
Python
0 vote168 views1 answer
Numpy rolling
Python
0 vote165 views1 answer
Tuples as return values
Python
1 vote150 views1 answer
Cool advances python ptoject ideas
Python
0 vote178 views1 answer
Python replace negative infinity
Python
0 vote154 views1 answer
Python sum of array until index
Python
5 votes161 views1 answer
Jupyter notebook widescreen
Python
2 votes155 views2 answers
AttributeError: module 'django.contrib.auth.views' has no attribute 'login'
Python
1 vote173 views5 answers
Numpy argsort
Python