Learn Python by Examples
Python Questions and answers selected from past papers
Question 1)
Write Python program to computes the sum of integer from 1 to 10 (including 1 and 10)?
Program
tot=0
i=1
while i<=10:
tot=tot+i
i=i+1
print ('Total of 1 to 10=',tot)
Output
Total of 1 to 10= 55
Question 2)
What would be the value of the variable temp after executing the statements temp=[23,45,2,-2,0][:3] of Python program?
Program
temp=[23,45,2,-2,0][:3:]
print(temp)
Output
[23, 45, 2]
Question 3)
What would be the value of the variable x after executing the statements x=3-4*6/3+12/4*3 of Python program?
Program
x=3-4*6/3+12/4*3
print(x)
Output
4.0
Question 4)
Factorial of a positive integer n is defined as n x (n-1) x (n-2) x ....3 x 2 x 1.
i) Propose an algorithm by using a Pseudocode to print the factorial of a given positive integer n.
ii) Write a Python program to implement your Pseudocode.
iii) Write a Python Function to implement your Pseudocode.
i)
start
input n
i=n
tot=1
while i>=1
tot=tot*i
i=i-1
endwhile
print tot
end
ii)
Program
n=eval(input('Enter a positive integer?'))
i=n
tot=1
while i>=1:
tot=tot*i
i=i-1
print('Factorial value of',n,'=',tot,sep=' ')
Output
Enter a positive integer?5
Factorial value of 5 = 120
iii)
#define a function
def my_factorial():
n=eval(input('Enter a positive integer?'))
i=n
tot=1
while i>=1:
tot=tot*i
i=i-1
print('Factorial value of',n,'=',tot,sep=' ')
#call the function
my_factorial()
Output
Enter a positive integer?5
Factorial value of 5 = 120
Note :
Another way to define the algorithm is given below where input variable n directly assign to the multiplication variable value tot but remember to get correct answer, statements' order should be changed within the repetition.
Carefully compare both algorithm.
#define a function
def my_factorial():
n=eval(input('Enter a positive integer?'))
tot=n
while n>1:
n=n-1
tot=tot*n
print('Factorial value of',tot,'=',tot,sep=' ')
#call the function
my_factorial()
Question 5)
a) The outputs of the flowchart
b) Write correct pseudo code
Output
a) 11, 22, 44
b)
Pseudocode
start
r=5
s=3
do
r=r+s
s=r+3
print s
while (r<25)
Note:
Programming languages such as Pascal, C, Java are having do..while and repeat...until repetition; but Python doesn't have repeat...until. The Python code to simulate the repeat...until is given below.
r=5
s=3
while True:
r=r+s
s=r+3
print(s)
if r>=25:
break
