Final
1. What is the boolean ouput of the code below
# two nested lists
l_one = [1,2,[3,4]]
l_two = [1,2,{'k1':4}]
# True or False?
l_one[2][0] >= l_two[2]['k1']
Answer
False
2. what will be output of the below program
class test:
def __init__(self,a="Hello World"):
self.a=a
def display(self):
print(self.a)
obj=test()
obj.display()
Answer
Hello World
3. Find the volume and surface area of a cylinder (height=2, radius=3)by defining the cylinder class.
The volume of a cylinder is given as $$ πr^2h $$
The surface area of the Cylinder is given as $$ 2πr^2 + 2πrh $$
Answer
class Cylinder:
def __init__(self,height=1,radius=1):
self.height = height
self.radius = radius
def volume(self):
return self.height*3.14*(self.radius)**2
def surface_area(self):
top = 3.14 * (self.radius)**2
return (2*top) + (2*3.14*self.radius*self.height)
c = Cylinder(2,3)
c.volume()
>> 56.52
c.surface_area()
>> 94.2
4. Write a function that asks for an integer and prints the square of it. Use a while loop with a try, except, else block to account for incorrect inputs.
Answer
def ask():
while True:
try:
num1 = int(input('Please enter a number: '))
result = num1**2
except:
print('An error occurred! Please try again!')
continue
else:
print(f'Thank you. Your number squared is: {result}')
break
5. Create a generator that generates the squares of numbers up to some number N.
Answer
def gensquares(N):
for i in range(N):
yield i**2
list(gensquares(10))
>> [0, 1, 4, 9, 16, 25, 36, 49, 64, 81]
6. Create a generator that yields "n" random numbers between a low and high number (that are inputs).
Use the random library.
Answer
import random
def rand_num(low,high,n):
for i in range(n):
yield random.randint(low, high)
list(rand_num(1,10,12))
>> [7, 5, 6, 3, 1, 2, 8, 6, 4, 4, 1, 10]
7. Write a Python program that matches a string that has an a followed by one or more b's.
print(text_match("ab")) -- Found a match!
print(text_match("abc")) -- Found a match!
Answer
import re
def text_match(text):
patterns = 'ab+'
if re.search(patterns, text):
return 'Found a match!'
else:
return('Not matched!')
print(text_match("ab"))
>> Found a match!
print(text_match("abc"))
>> Found a match!
8. Define Line class methods to accept coordinates as a pair of tuples and return the slope and distance of the line.
Slope of the line is given as $$ \frac{y2 -y1}{x2 -x1} $$
Distance of the line is given as
$$
\sqrt{((x2 -x1)^2 + (y2 -y1)^2)}
$$
coordinate1 = (3,2) coordinate2 = (8,10)
Answer
class Line:
def __init__(self,coor1,coor2):
self.coor1 = coor1
self.coor2 = coor2
def distance(self):
# tuple unpacking
x1,y1 = self.coor1
x2,y2 = self.coor2
return ((x2-x1)**2 + (y2-y1)**2)**0.5
def slope(self):
x1,y1 = self.coor1
x2,y2 = self.coor2
return (y2-y1)/(x2-x1)
coordinate1 = (3,2)
coordinate2 = (8,10)
li = Line(coordinate1,coordinate2)
li.distance()
>> 9.433981132056603
li.slope()
>> 1.6
9. Write a Python program to determine whether a given year is a leap year.
Answer
def leap_year(y):
if y % 400 == 0:
return True
if y % 100 == 0:
return False
if y % 4 == 0:
return True
else:
return False
print(leap_year(1900))
>> False
print(leap_year(2004))
>> True
10. Write a Python program to get the current time.
Answer
import datetime
print(datetime.datetime.now().time())