'''
Write a Python program with a class for managing the inventory of
fruit vendor who sells only one kind of fruit. The vendor has three operations:
'''

class Vendor:

def __init__(self):
   """
         The program starts with zero inventory and supports the above operations.
   """
   self.fruit = 0
   pass

def add(self, number):
   """
   Add fruits to inventory â€“ adds the number of fruits to the inventory
   :param number: number of fruits
   :return: True if the number of fruits is positive
   """
   # only accept positive number
   if number >= 0:
         self.fruit += number
         return True
         pass
   return False
   pass

"""

      """
def sell(self, number):
   """
   Sell fruits â€“ reduces the number of fruits in the inventory
   :param number: number of fruit to be sold
   :return: True if these fruits could be sold
   """
   if number <= self.fruit:
         self.fruit -= number
         return True
         pass
   return False
   pass

def check(self):
   """
         Check inventory â€“ returns the number of fruits in the inventory
   :return: the number of fruits in the inventory
   """
   return self.fruit
   pass

pass

selection = 0
vendor = Vendor()
while selection != '4':

Assignment a. Version 1 From the user data, make a DataFrame df1...