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log transform pandas dataframe

# Calculate natural logarithm on  'Salary' column 
data['natural_log'] = np.log(data['Salary']) 
data   # Show the dataframe 
# Calculate logarithm to base 2  on 'Salary' column 
data['logarithm_base2'] = np.log2(data['Salary']) 
data   # Show the dataframe
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