We can do by adding row into PrettyTable object by add_row method.

Demo:

>>> from prettytable import PrettyTable
>>> import random
>>> 
>>> x = PrettyTable(["ServiceID", "Service", "Price"])
>>> 
>>> while True:
...     #- Get value
...     ID = random.randint(1,90000) #range high to lower probability of non-uniqueness
...     prompt1 = raw_input("Please add a service name to the list\n")
...     try:
...         #- Type Casting.
...         prompt2 = int(raw_input("Please enter a price for the service\n"))
...     except ValueError:
...         print("Please enter valid type")
...         continue
...     #- Add row
...     x.add_row([ID, prompt1, prompt2])
...     #- Ask user to Continue or not.
...     choice = raw_input("Continue yes/ no:").lower()
...     if not(choice=="yes" or choice=="y"):
...         break
... 
Please add a service name to the list
2
Please enter a price for the service
3
Continue yes/ no:y
Please add a service name to the list
4
Please enter a price for the service
6
Continue yes/ no:y
Please add a service name to the list
5
Please enter a price for the service
7
Continue yes/ no:n
>>> print x
+-----------+---------+-------+
| ServiceID | Service | Price |
+-----------+---------+-------+
|   38515   |    2    |   3   |
|    8680   |    4    |   6   |
|   51188   |    5    |   7   |
+-----------+---------+-------+
>>> 

Delete Row:

Use del_row() method. We need to pass index of row which we want to remove.

>>> print x
+-----------+---------+-------+
| ServiceID | Service | Price |
+-----------+---------+-------+
|   38515   |    2    |   3   |
|    8680   |    4    |   6   |
|   51188   |    5    |   7   |
+-----------+---------+-------+
>>> x.del_row(1)
>>> print x
+-----------+---------+-------+
| ServiceID | Service | Price |
+-----------+---------+-------+
|   38515   |    2    |   3   |
|   51188   |    5    |   7   |
+-----------+---------+-------+

Need to handle exception if we provide index value greater then total rows in exception will raise, that need to handle in ur code.

Exception is:

>>> x.del_row(10)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/prettytable.py", line 832, in del_row
    raise Exception("Cant delete row at index %d, table only has %d rows!" % (row_index, len(self._rows)))
Exception: Cant delete row at index 10, table only has 2 rows!

Note:

1. Use raw_input() for Python 2.x

2. Use input() for Python 3.x