Python Slip 5

Q1. Write a python program to show use of assert keyword.

In Python we can use assert statement in two ways.

1. assert statement has a condition and if the condition is not satisfied the program will stop and give AssertionError.
2. assert statement can also have a condition and a optional error message. If the condition is not satisfied assert stops the program and gives AssertionError along with the error message.

def avg(marks):
    assert len(marks) != 0,"List is empty."
    return sum(marks)/len(marks)

mark2 = [55,88,78,90,79]
print("Average of mark2:",avg(mark2))

mark1 = []
print("Average of mark1:",avg(mark1))

Average of mark2: 78.0

---------------------------------------------------------------------------
AssertionError                            Traceback (most recent call last)
~\AppData\Local\Temp/ipykernel_11928/3890474036.py in <module>
      7 
      8 mark1 = []
----> 9 print("Average of mark1:",avg(mark1))

~\AppData\Local\Temp/ipykernel_11928/3890474036.py in avg(marks)
      1 def avg(marks):
----> 2     assert len(marks) != 0,"List is empty."
      3     return sum(marks)/len(marks)
      4 
      5 mark2 = [55,88,78,90,79]

AssertionError: List is empty.

Q2. Write a python program to perform following task.

a. Calculate the factorial of given number.

num = int(input("Enter a number: "))
factorial = 1
# check if the number is negative, positive or zero
if num < 0:
   print("Sorry, factorial does not exist for negative numbers")
elif num == 0:
   print("The factorial of 0 is 1")
else:
   for i in range(1,num + 1):
       factorial = factorial*i
   print("The factorial of",num,"is",factorial)

Enter a number: 6
The factorial of 6 is 720

b. Reverse the given number.

num = int(input("Enter a number: "))
reversed_num = 0
while num != 0:
    digit = num % 10
    reversed_num = reversed_num * 10 + digit
    num //= 10

print("Reversed Number: " + str(reversed_num))

Enter a number: 78945
Reversed Number: 54987

Q2. Write a python program which takes file name as input and print the lines after making only first character of each word in the sentence capitalized.

totContent = ""
print("Enter the Name of File: ")
fileName = str(input())
fp = open(fileName, "r")

for content in fp:
    newContent = content.title()
    totContent = totContent + newContent
print("\n",totContent)
fp.close()
fp = open(fileName, "w")
fp.write(totContent)

print("All Words Capitalized Successfully!")
fp.close()

Enter the Name of File: 
test.txt

 Rahul Sonawane
November July May March Jun
Tal Nsk Rahul
Dist Nashik
Rahul
All Words Capitalized Successfully!