Page 146 - Computer Science V2.0 Class 11

As expected, the variable num1 now gets associated with the new object 12. The variable num continues to be
associated with object 10. Next, let us consider:
>>> num = 12.4
>>> id(num)
2489891082064
Note that on the execution of the assignment statement, num = 12.4, Python associates the variable num with the
floating-point object 12.4 having object id 2489891082064.

It is interesting to note that Python may (not necessarily) create different objects for the same value. For example,
>>> id(12.4)
2489862941840
>>> id(12.4)
2489895421264
>>> id(234)
140709242834464
>>> id(234)
140709242834464
Typically, a short integer in Python gets associated with a fixed object id, but the same may not be true in the case
of more complex objects like floating-point numbers. Finally, let us see some more examples of the assignment
statements:
num = 10 (the variable num is assigned the value 10)
city = 'Delhi' (the variable city is assigned the string 'Delhi')
price = 150.50 (the variable price is assigned the floating-point value 150.50)
discount = 10/100*price (the variable discount is assigned the result of evaluating the expression 10/100*price.

num 10 1000X

city "Delhi" 2000X

price 150.50 3000X

15.05
discount 4000X
(result of 10/100*150.50)

Fig 6.2: Variables and their values
To experiment with variables and their values, let us write a Python program.

Program 6.1 Playing with variables and data values

1 #Objective: To experiment with variables and their values

2 city = 'Delhi'
3 interestRate = 9.5
4 print('city =', city)
5 print('interestRate =', interestRate)

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