Draw the entire environment, including all user-defined variables at the time line 10 is being executed.

Q. Draw the entire environment, including all user-defined variables at the time line 10 is being executed.

def sum(a, b, c, d):                                              #1
    result = 0                                                          #2
    result = result + a + b + c + d                         #3
    return result                                                    #4
                                                                              #5
def length():                                                         #6
    return 4                                                            #7
                                                                              #8
def mean(a, b, c, d):                                            #9
    return float (sum (a, b, c, d))/length()          #10
                                                                             #11
print (sum(a, b, c, d), length(), mean(a, b, c, d))          #12


Answer =

When line 10 executes then it must be call from line 12.

At first line 12 is created in global environment. Then it call sum and create local environment within global environment. Then sum function return the values in global environment.

Then line 12 call length and create local environment within global environment. Then length function return the values in global environment. Then line 12 call mean and create local environment within global environment. Then mean function call sum and create nested local environment. Then sum function return values in local environment. Then mean function call length and create nested local environment. Then length function return values in local environment.

Then mean function return values in line 12 in global environment.