Instead of ASMD just put the operators between the single inverted commas and remove all the lines where you wrote operation ='.....'
For eg. : if ch =='+'
Result=num1+num2
num1 = int(input("Enter First Number: "))
num2 = int(input("Enter Second Number: "))
print("Enter which operation would you like to perform?")
ch = input("Enter any of these operators for specific operation + for Addition, - for Subtraction, * for Multiplication, / for Division: ")
result = 0
if op == '+':
result = num1 + num2
elif ch == '-':
result = num1 - num2
elif ch == '*':
result = num1 * num2
elif ch == '/':
result = num1 / num2
else:
print("Input character is not recognized!")
print(num1, ch , num2, ":", result)