# import necessary libraries
import pandas as pd
import numpy as np
# create sample data
data = {
'Name': ['Alice', 'Bob', 'Charlie', 'Dave'],
'Age': [25, 30, 35, 40],
'Gender': ['F', 'M', 'M', 'M'],
'Salary': [50000, 70000, 60000, 80000],
'Country': ['USA', 'Canada', 'UK', 'Australia']
}
# convert data into a dataframe
df = pd.DataFrame(data)