Python Slip 4

Q1. Write a python program to show how to raise an exception in python.

try:
    roll = int(input("Please enter your roll number"))
    if roll <= 0:
        raise ValueError("The number entered is not positive")
    print(num)
except ValueError as v:
    print("ValueError Exception thrown")
    print(v)
except:
    print("Roll Number Is Valid")
print("\n\nOutside of try-except clauses.")

Please enter your roll number-5
ValueError Exception thrown
The number entered is not positive


Outside of try-except clauses.

Q2. Write a python program to display ‘n’ terms of Fibonacci series using recursion

def recur_fibo(n):
   if n <= 1:
       return n
   else:
       return(recur_fibo(n-1) + recur_fibo(n-2))
nterms = int(input("Please enter your number"))
# check if the number of terms is valid
if nterms <= 0:
   print("Plese enter a positive integer")
else:
   print("Fibonacci sequence:")
   for i in range(nterms):
       print(recur_fibo(i))

Please enter your number7
Fibonacci sequence:
0
1
1
2
3
5
8

Q2. Write a python program to reverse each word of sentence of a file and also count total lines.

num_lines=0
with open("test.txt", "r") as f:
    for line in f:
        num_lines += 1
with open("test.txt", "r") as f:
    data = f.read()
    for line in f:
        num_lines += 1
new_data = ""
for word in data.split():
    rev_word = word[::-1]
    new_data += rev_word
    new_data += " "

#Writing the new data in text file
with open("output.txt","w") as f:
    f.write(new_data)
print("Number of lines:")
print(num_lines)

Number of lines:
5