COP4521 Homework 1

Name:                         FSU login:

1 (20 points). The content of file aa.py is as follows:
--
print("aa.py Top level", __name__)
def hello():
    print("Hello from", __name__)
--

The content of file bb.py is as follows:
--
import aa

print("bb.py Top level", __name__)
aa.hello()
--

What is the output when we run bb with 'python3 bb.py' on linprog? (10 points)
Explain why each line is printed as it is (10 points)













2 (20 points). Consider the following code segment:

def addObj(a, b):
    a.append(b)
    print('Inside 1: a = ', a)
    a = a + [b]
    print('Inside 2: a = ', a)

lst = [1, 2, 3]
addObj(lst, 100)
print('Outside: lst = ', lst)

What is the output when the code segment is executed? (10 points)
Explain why each line is printed as it is (10 points)







3 (20 points). Let the content of foo.py be the following:

------------
count = 0

def incCount():
    count = count + 1

incCount()
print(count)
-------------

What is the output when you run the code with 'python3 foo.py' on linprog (10 points)?
Explain your answer (10 points)







4 (20 points). What is the output of the following code segment when executed
(10 points)? Briefly explain (10 points).

def aaa(x):
    def bbb(y):
        c = x * x
	return c * y

    return bbb

area10 = aaa(10)

print(area10(3))
print(area10(5))









5 (20 points). Let a sequence of numbers be 5, 5, 3, 7, 1, 9, ...
More precisely, the first three numbers are x_1= 5, x_2=5, and x_3 = 3.
Following that x_i = x_{i-3} + x_{i-2} - x_{i-1}. For example,
x_4 = x_1 + x_2 - x_3 = 5 + 5 - 3 = 7; x_5 = x_2 + x_3 - x_4 = 5 + 3 - 7 = 1;
and so on. Write a generator for this sequence.