Computer Science
The id( ) can be used to get the memory address of a variable. Consider the adjacent code and tell if the id( ) functions will return the same value or not(as the value to be printed via print() ) ? Why ?
[There are four print() function statements that are printing id of variable num in the code shown on the right.
num = 13
print( id(num) )
num = num + 3
print( id(num) )
num = num - 3
print( id(num) )
num = "Hello"
print( id(num) )
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Answer
num = 13
print( id(num) ) # print 1
num = num + 3
print( id(num) ) # print 2
num = num - 3
print( id(num) ) # print 3
num = "Hello"
print( id(num) ) # print 4
For the print statements commented as print 1 and print 3 above, the id() function will return the same value. For print 2 and print 4, the value returned by id() function will be different.
The reason is that for both print 1 and print 3 statements the value of num is the same which is 13. So id(num) gives the address of the memory location which contains 13 in the front-loaded dataspace.
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