Q: Question 1Which of the following is not a legal type in Python ?IntegerStringListGeneric

GenericReason — Generic is not a legal type in Python while Integer, String and List are legal data types in Python.

Q: Question 2Which of the following allow you to take input from user ?raw_input( )enter( )eval( )input

raw_input( ) and inputReason — raw_input( ) and input() functions allow us to take input from user.

Q: Question 3Which of the following functions will you use to find out the type of a variable ?datatype( )type( )typeof( )dtype( )

type( )Reason — The type( ) function is used to find out the type of a variable.

Q: Question 4To convert input received via raw_input( ) of Python 2.x in a numeric type, which of the given functions can be used ?convert( )float( )int( )No conversion required as input is already in desired form.

float( ) and int( )Reason — Python offers float( ) and int( ) functions to be used with raw_input() to convert the values received through raw_input() into integer and float types.

Q: Question 5To convert input received via input( ) of Python 2.x in a numeric type, which of the given functions can be used ?convert( )float( )int( )No conversion required as input in already in desired form.

No conversion required as input in already in desired form.Reason — The input() evaluates the given input and returns the value accordingly. Thus, no conversion is required as input in already in desired form.

Q: Question 1How are floating constants represented in Python ? Give examples to support your answer.

Floating constants are represented in Python in two forms — Fractional Form and Exponent form. Examples:Fractional Form — 2.0, 17.5, -13.0, -0.00625Exponent form — 152E05, 1.52E07, 0.152E08, -0.172E-3

Q: Question 2How are string-literals represented and implemented in Python ?

A string-literal is represented as a sequence of characters surrounded by quotes (single, double or triple quotes). String-literals in Python are implemented using Unicode.

Q: Question 3(i)What will be the output produced by following code fragment ?X = 10 X = X + 10 X = X - 5 print X X, Y = X - 2, 22 print X, Y

Output15 13 22 ExplanationX = 10 ⇒ assigns an initial value of 10 to X.X = X + 10 ⇒ X = 10 + 10 = 20. So value of X is now 20.X = X - 5 ⇒ X = 20 - 5 = 15. X is now 15.print (X) ⇒ print the value of X which is 15.X, Y = X - 2, 22 ⇒ X, Y = 13, 22.print (X, Y) ⇒ prints the value of X which is 13 and Y which is 22.

Question 1

Question 1(a) What will be the output produced by following code fragments ?(i)a, b = 2, 3
c, b = a, c + 1 
print a, b, c(ii)x, y = 2, 6
x, y = y, x + 2
print x, y(b) What will the output produced if we interchange the first two lines of above two codes [given in part (a)], e.g., as shown below for code (i) ? Will it give any error ? Give reason(s).c, b = a, c + 1 
a, b = 2, 3
print a, b, c

Accepted Answer

(a)(i) This code fragment will generate the below error:NameError: name 'c' is not defined
Reason — The error is generated because in line 2, the variable c is not defined before being used.(ii)Output6 4
ExplanationStatementValue of XValue of YRemarkx, y = 2, 626Both x, y are initializedx, y = y, x + 264x = 6, y = 2 + 2 = 4print (x, y)646 (x), 4 (y) are printed(b) When we interchange the first two lines of above codes, we get the following outputs:(i) It will give the same error as before because even after interchanging first two lines variable C is still used before it is defined.(ii) Interchanging the first two lines will generate the below error:NameError: name 'y' is not defined
Reason — The error is generated because now in line 1, the variable y is not defined before being used.

Question 2

Question 2A bank account contains ₹10,000 and earns interest at the rate of 5 percent per year. The interest is added to the account. After one year the bank account contains the original sum of ₹10,000 plus the interest, which is 5% of ₹10,000, i.e., 10,000 * (5/100).So, the final account balance is 10000 + 10000 * (5/100) = 10000 * (1 + (5/100)) = 10000 * 1.05.(a) Write Python code script to calculate the balance in account as per this after one year.(b) Write Python code script to calculate the balance in account as per this after four years while showing balance after every year.(c) Write Python script that displays the number of takes for the account balance to be at least double the original balance.

Accepted Answer

(a) Python code script to calculate the balance in account after one year:p = 10000
r = 5
si = p * r  / 100
bal = p + si
print ("Balance = ₹", bal)OutputBalance = ₹ 10500.0
(b) Python code script to calculate the balance in account after four year while showing balance after every year:p = 10000
r = 5
si = p * r / 100
p = p + si
print ("Balance after 1st year = ₹", p) 
si = p * r / 100
p = p + si
print ("Balance after 2nd year = ₹", p) 
si = p * r / 100
p = p + si
print ("Balance after 3rd year = ₹", p) 
si = p * r / 100
p = p + si
print ("Balance after 4th year = ₹", p) OutputBalance after 1st year = ₹ 10500.0
Balance after 2nd year = ₹ 11025.0
Balance after 3rd year = ₹ 11576.25
Balance after 4th year = ₹ 12155.0625
(c) Python code script to display the number of takes for the account balance to be at least double the original balance:p = 10000
r = 5
t = p * 2
c = 0
while p < t:
    si = p * r  / 100
    p = p + si
    c = c + 1
print ("No. of takes =", c)OutputNo. of takes = 15

Question 3

Question 1Which of the following is not a legal type in Python ?IntegerStringListGeneric

Accepted Answer

GenericReason — Generic is not a legal type in Python while Integer, String and List are legal data types in Python.

Question 4

Question 2Which of the following allow you to take input from user ?raw_input( )enter( )eval( )input

Accepted Answer

raw_input( ) and inputReason — raw_input( ) and input() functions allow us to take input from user.

Question 5

Question 3Which of the following functions will you use to find out the type of a variable ?datatype( )type( )typeof( )dtype( )

Accepted Answer

type( )Reason — The type( ) function is used to find out the type of a variable.

Question 6

Question 4To convert input received via raw_input( ) of Python 2.x in a numeric type, which of the given functions can be used ?convert( )float( )int( )No conversion required as input is already in desired form.

Accepted Answer

float( ) and int( )Reason — Python offers float( ) and int( ) functions to be used with raw_input() to convert the values received through raw_input() into integer and float types.

Question 7

Question 5To convert input received via input( ) of Python 2.x in a numeric type, which of the given functions can be used ?convert( )float( )int( )No conversion required as input in already in desired form.

Accepted Answer

No conversion required as input in already in desired form.Reason — The input() evaluates the given input and returns the value accordingly. Thus, no conversion is required as input in already in desired form.

Question 8

Question 1How are floating constants represented in Python ? Give examples to support your answer.

Accepted Answer

Floating constants are represented in Python in two forms — Fractional Form and Exponent form. Examples:Fractional Form — 2.0, 17.5, -13.0, -0.00625Exponent form — 152E05, 1.52E07, 0.152E08, -0.172E-3

Question 9

Question 2How are string-literals represented and implemented in Python ?

Accepted Answer

A string-literal is represented as a sequence of characters surrounded by quotes (single, double or triple quotes). String-literals in Python are implemented using Unicode.

Question 10

Question 3(i)What will be the output produced by following code fragment ?X = 10
X = X + 10
X = X - 5
print X
X, Y = X - 2, 22
print X, Y

Accepted Answer

Output15
13 22
ExplanationX = 10 ⇒ assigns an initial value of 10 to X.X = X + 10 ⇒ X = 10 + 10 = 20. So value of X is now 20.X = X - 5 ⇒ X = 20 - 5 = 15. X is now 15.print (X) ⇒ print the value of X which is 15.X, Y = X - 2, 22 ⇒ X, Y = 13, 22.print (X, Y) ⇒ prints the value of X which is 13 and Y which is 22.

Question 11

Question 3(ii)What will be the output produced by following code fragment ?first = 2
second = 3
third = first * second
print first, second, third 
first = first + second + third 
third = second * first
print first, second, third

Accepted Answer

Output2 3 6
11 3 33
Explanationfirst = 2 ⇒ assigns an initial value of 2 to first.second = 3 ⇒ assigns an initial value of 3 to second.third = first * second ⇒ third = 2 * 3 = 6. So variable third is initialized with a value of 6.print first, second, third ⇒ prints the value of first, second, third as 2, 3 and 6 respectively.first = first + second + third ⇒ first = 2 + 3 + 6 = 11third = second * first ⇒ third = 3 * 11 = 33print first, second, third ⇒ prints the value of first, second, third as 11, 3 and 33 respectively.

Question 12

Question 3(iii)What will be the output produced by following code fragment ?side = int(raw_input('side'))	#side given as 7
area = side * side
print side, area

Accepted Answer

Output7 49
Explanationside = int(input('side') ) ⇒ This statements asks the user to enter the side. We enter 7 as the value of side.area = side * side ⇒ area = 7 * 7 = 49.print (side, area) ⇒ prints the value of side and area as 7 and 49 respectively.

Question 13

Question 4What are data types ? How are they important ?

Accepted Answer

Data types are used to identify the type of data a memory location can hold and the associated operations of handling it. The data that we deal with in our programs can be of many types like character, integer, real number, string, boolean, etc. Hence programming languages including Python provide ways and facilities to handle all these different types of data through data types.The data types define the capabilities to handle a specific type of data such as memory space it allocates to hold a certain type of data and the range of values supported for a given data type, etc.

Question 14

Question 5Write instructions to get the following result :Math is Fun so don't be resistant
Just learn the rules, the rules are consistent 
And most important, you must be persistent !

Adding fractions, get common denominators.
Multiply by missing factors to get the denominators. 
Add numerators only, NOT denominators.
Do it in both interactive mode and script mode.

Accepted Answer

Interactive Mode>>> print("Math is Fun so don't be resistant")
Math is Fun so don't be resistant
>>> print("Just learn the rules, the rules are consistent")
Just learn the rules, the rules are consistent
>>> print("And most important, you must be persistent !")
And most important, you must be persistent !
>>> print("")

>>> print("Adding fractions, get common denominators.")
Adding fractions, get common denominators.
>>> print("Multiply by missing factors to get the denominators.")
Multiply by missing factors to get the denominators.
>>> print("Add numerators only, NOT denominators.")
Add numerators only, NOT denominators.
>>>

Script ModeSolutionprint("Math is Fun so don't be resistant")
print("Just learn the rules, the rules are consistent")
print("And most important, you must be persistent !")
print("")
print("Adding fractions, get common denominators.")
print("Multiply by missing factors to get the denominators.")
print("Add numerators only, NOT denominators.")OutputMath is Fun so don't be resistant
Just learn the rules, the rules are consistent
And most important, you must be persistent !

Adding fractions, get common denominators.
Multiply by missing factors to get the denominators.
Add numerators only, NOT denominators.

Question 15

Question 6How many integer types are supported by Python ? Name them.

Accepted Answer

Two integer types are supported by Python. They are:Integers (signed)Booleans

Question 16

Question 7Differentiate between plain integer and long integer.

Accepted Answer

Plain integers generally use 32 bits (4 bytes) to store a value. Long integers, on the other hand, don't have any size limitation for storing the value, they can grow arbitrarily large subject to available memory.

Question 17

Question 8Write instructions in interactive mode for the following :(i) to display sum of 8, 9.0, 2 * 3(ii) to print sum of 8, 9.0, 2 * 3

Accepted Answer

(i)>>> 8 + 9.0 + 2 * 3
23.0
(ii)>>> print(8 + 9.0 + 2 * 3)
23.0

Question 18

Question 9Write a program that generates the following output :5
10
9
Assign value 5 to a variable using assignment operator (=). Multiply it with 2 to generate 10 and subtract 1 to generate 9.

Accepted Answer

Solutiona = 5
print(a)
a = a * 2
print(a)
a = a - 1
print(a)Output5
10
9

Question 19

Question 10Write a Python program that accepts radius of a circle and prints its area.

Accepted Answer

Solutionr = float(input("Enter radius of circle: "))
a = 3.14159 * r * r
print("Area of circle =", a)OutputEnter radius of circle: 7.5
Area of circle = 176.7144375

Question 20

Question 11Write Python program that accepts marks in 5 subjects and outputs average marks.

Accepted Answer

Solutionm1 = int(input("Enter first subject marks: "))
m2 = int(input("Enter second subject marks: "))
m3 = int(input("Enter third subject marks: "))
m4 = int(input("Enter fourth subject marks: "))
m5 = int(input("Enter fifth subject marks: "))
avg = (m1 + m2+ m3+ m4 + m5) / 5;
print("Average Marks =", avg)OutputEnter first subject marks: 65
Enter second subject marks: 78
Enter third subject marks: 79
Enter fourth subject marks: 80
Enter fifth subject marks: 85
Average Marks = 77.4

Introducing Python

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