Count Unique Elements in pandas DataFrame Column in Python (Example Code)

import pandas as pd                               # Import pandas library

import pandas as pd # Import pandas library

my_df = pd.DataFrame({'A':[7, 7, 4, 1, 2, 8, 2],  # Construct example DataFrame in Python
                      'B':range(1, 8)})
print(my_df)                                      # Display example DataFrame in console
#    A  B
# 0  5  1
# 1  7  2
# 2  4  3
# 3  1  4
# 4  2  5
# 5  8  6
# 6  2  7

my_df = pd.DataFrame({'A':[7, 7, 4, 1, 2, 8, 2], # Construct example DataFrame in Python 'B':range(1, 8)}) print(my_df) # Display example DataFrame in console # A B # 0 5 1 # 1 7 2 # 2 4 3 # 3 1 4 # 4 2 5 # 5 8 6 # 6 2 7

print(my_df['A'].nunique())                       # Count unique values in column
# 5

print(my_df['A'].nunique()) # Count unique values in column # 5