Consider the following Python program x 1 y 3 z 5 def sub

Consider the following Python program:

x = 1;

y = 3;

z = 5;
def sub1():

a = 7;

y = 9;

z = 11;

...

def sub2():

global x;

a = 13;

x = 15;

w = 17;

...

def sub3():

nonlocal a;

a = 19;

b = 21;
z = 23;

...

...

List all the variables, along with the program units where they are declared, that are visible in the bodies of sub1, sub2, and sub3, assum- ing static scoping is used.

Solution

Here I am displaying all the accessible variable with units in each subroute and where they have declared. It is actually showing that which variable value is used in particular sub-routine.

In main:

x=1                 Main

y=3                 Main

z=5               Main

In sub1:

a=7                     sub1

y=9                     sub1

z=11                   sub1

x=1                    main

In sub2:

a=13                     sub2

x=15                     sub2

w=17                    sub2

y=3                      main

z=5                     main

In sub3:

a=19                     sub3

b= 21                    sub3

z=23                     sub3

w=17                    sub2

x=15                     sub2             //because of global variable

y =3                    main