import matplotlib.pyplot as plt

# Quick inspection of the data
world.plot.barh(x='Tennis_Player',
                y= 'Total_Weeks_at_No_1',
                figsize = (15, 10),
               )

# Filtering the output, weeks at no 1 greater than 50 will only be shown.
world[world.Total_Weeks_at_No_1 > 50].plot.barh(x='Tennis_Player',
                                                y= 'Total_Weeks_at_No_1',
                                                figsize = (15, 10),
                                               )