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## cluster IMDB Ratings
import pandas as pd
import numpy as np
 
## determine conditions in function case_when
 
def case_when(row):
  if (row['IMDB_Rating'] >= 0) & (row['IMDB_Rating'] <= 6): 
    return 'OK'  
  elif (row['IMDB_Rating'] > 6) & (row['IMDB_Rating'] <= 8):
    return 'Good'
  else:
      return 'Excellent'
 
# apply case_when function
mydata['IMDB_cat'] = mydata.apply(case_when, axis=1)