Python Practice Problems

Question

Write a program that asks the user for their name and age, then prints:
Hello xnocode, you are 21 years old!

user = input()
age = int(input())
print("Hello ",user,", you are ",age,"years old!")

output

xnocode
21
Hello  xnocode , you are  21 years old!

Question

Take two numbers as input from the user and print their:

• sum

• difference

• product

• quotient

a = float(input("enter 1st number: "))
b = float(input("enter 2nd number: "))
 
sum = a + b
difference = a - b
product = a * b
quotient = a / b
 
print("sum:", sum)
print("difference:", difference)
print("product:", product)
print("quotient:", quotient)

output

enter 1st number: 10
enter 2nd number: 5
sum: 15.0
difference: 5.0
product: 50.0
quotient: 2.0

Question

Ask the user to enter two integers and one float.
Convert all values to float and print their average.

a = int(input("enter 1st integer: "))
b = int(input("enter 2nd integer: "))
c = float(input("enter a float: "))
 
avg = (float(a) + float(b) + float(c)) / 3
 
print("average:", avg)

output

enter 1st integer: 10
enter 2nd integer: 20
enter a float: 30.5
average: 20.166666666666668

Question

The user enters a string containing a number (e.g., "45").
Convert it to:

• integer

• float

• string again
  Print all values with their types.

value = input("enter a number: ")
 
int_val = int(value)
float_val = float(value)
str_val = str(value)
 
print(int_val, type(int_val))
print(float_val, type(float_val))
print(str_val, type(str_val))

output

enter a number: 45
45 <class 'int'>
45.0 <class 'float'>
45 <class 'str'>

Question

Evaluate the expression:
x = 10 + 3 * 2 ** 2
Print the result and explain why the output is correct based on operator precedence.

x = 10 + 3 * 2 ** 2
print(x)

output

22

Note

2**2 = 4 → 3*4 = 12 → 10+12 = 22

Question

Write a program to swap values of two numbers entered by the user.

a = int(input("enter a: "))
b = int(input("enter b: "))
 
a, b = b, a
 
print("a:", a)
print("b:", b)

output

enter a: 5
enter b: 10
a: 10
b: 5

Question

Ask the user for temperature in Celsius (string input).
Convert it to float and calculate Fahrenheit.

Formula:
FahrenheitTemp = (CelsiusTemp * (9/5)) + 32

c = float(input("enter temperature in Celsius: "))
 
f = (c * (9/5)) + 32
 
print("Fahrenheit:", f)

output

enter temperature in Celsius: 25
Fahrenheit: 77.0

Question

Take the radius (r) as input and print the area.

Formula:
Area = 3.14 * r ** 2

r = float(input("enter radius: "))
 
area = 3.14 * r ** 2
 
print("Area:", area)

output

enter radius: 2
Area: 12.56

Question

Ask the user for Principal (P), Rate (R), Time (T).
Convert all to float and compute Simple Interest.

Formula:
SI = (P * R * T) / 100

p = float(input("enter principal: "))
r = float(input("enter rate: "))
t = float(input("enter time: "))
 
si = (p * r * t) / 100
 
print("Simple Interest:", si)

output

enter principal: 1000
enter rate: 5
enter time: 2
Simple Interest: 100.0

Question

Take a decimal number as input (e.g., 45.78) and print:

• integer part → 45

• fractional part → .78

num = float(input("enter a number: "))
 
int_part = int(num)
frac_part = num - int_part
 
print("integer part:", int_part)
print("fractional part:", frac_part)

output

enter a number: 45.78
integer part: 45
fractional part: 0.7800000000000011