how to check a number is less than equal and greater than in python code example

Example 1: python see if a number is greater than other

# Python program to find the largest number among the three input numbers
# take three numbers from user
num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))
num3 = float(input("Enter third number: "))
 
if (num1 > num2) and (num1 > num3):
   largest = num1
elif (num2 > num1) and (num2 > num3):
   largest = num2
else:
   largest = num3
 
print("The largest number is",largest)

Example 2: python if greater than and less than

if 10 < a < 20:
    whatever