Question

Invalid entry code in python

my code is pasted below. The last elif statement, I'm trying to get the program to print "invalid entry" if the entry for user_input is invalid. The first user prompt should only allow for numbers 1-10 and "exit" and "quit"

import math
user_prompt = """Enter number of operation that you want to execute <type exit or quit to end program>:
1 sin(x)
2 cos(x)
3 tan(x)
4 asin(x)
5 acos(x)
6 atan(x)
7 ln(x)
8 sqrt(x)
9 factorial(x)
10 history
Select-> """ #prompting user

results = []
valid_response = ['1, 2, 3, 4, 5, 6, 7, 8, 9, 10, quit, exit']

while True:
user_input = input(user_prompt)
print(f'User input is {user_input}')
if user_input.lower() == 'quit' or user_input == 'exit':
print()
break #terimates the program due to quit or exit response
elif user_input == '10': # displaying the history
for i in results:
print(i)
continue

user_num_text = input("\nEnter the argument for operation -> ")
user_number = float(mcs_num_text)
if user_input == '1':
result = math.sin(math.radians(user_number))
temp = f'sin({user_number}) = {result}' #sin
elif user_input == '2':
result = math.cos(math.radians(user_number))
temp = f'cos({user_number}) = {result}' #cos
elif user_input == '3':
result = math.tan(math.radians(user_number))
temp = f'tan({user_number}) = {result}' #tan
elif user_input == '4':
result = math.asin(math.radians(user_number))
temp = f'asin({user_number}) = {result}' #asin
elif user_input == '5':
result = math.acos(math.radians(user_number))
temp = f'acos({user_number}) = {result}' #acos
elif user_input == '6':
result = math.atan(math.radians(user_number))
temp = f'atan({user_number}) = {result}' #atan
elif user_input == '7':
result = math.log(float(user_number))
temp = f'ln({user_number}) = {result}' #ln
elif user_input == '8':
result = math.sqrt(float(user_number))
temp = f'sqrt({user_number}) = {result}' #sqrt
elif user_input == '9':
result = math.factorial(int(user_number))
temp = f'factorial({user_number}) = {result}' #factorial
elif user_input is not valid_response:
temp = 'Invalid entry.'

print(temp)
results.append(temp)

Answer 1

The problem is with user_input us not valid_response statement. is not should be replaced with <not in>. Here is the modified code:

import math
user_prompt = """Enter number of operation that you want to execute <type exit or quit to end program>:
1 sin(x)
2 cos(x)
3 tan(x)
4 asin(x)
5 acos(x)
6 atan(x)
7 ln(x)
8 sqrt(x)
9 factorial(x)
10 history
Select-> """ 

results = []
valid_response = ['1, 2, 3, 4, 5, 6, 7, 8, 9, 10, quit, exit']

while True:
    user_input = input(user_prompt)
    print(f'User input is {user_input}')
    if user_input.lower() == 'quit' or user_input == 'exit':
        print()
        break
    elif user_input == '10': # displaying the history
        for i in results:
            print(i)
            continue
    if user_input in ['1','2','3','4','5','6','7','8','9']:
        user_num_text = input("\nEnter the argument for operation -> ")
        user_number = float(user_num_text)
        if user_input == '1':
            result = math.sin(math.radians(user_number))
            temp = f'sin({user_number}) = {result}' #sin
        elif user_input == '2':
            result = math.cos(math.radians(user_number))
            temp = f'cos({user_number}) = {result}' #cos
        elif user_input == '3':
            result = math.tan(math.radians(user_number))
            temp = f'tan({user_number}) = {result}' #tan
        elif user_input == '4':
            result = math.asin(math.radians(user_number))
            temp = f'asin({user_number}) = {result}' #asin
        elif user_input == '5':
            result = math.acos(math.radians(user_number))
            temp = f'acos({user_number}) = {result}' #acos
        elif user_input == '6':
            result = math.atan(math.radians(user_number))
            temp = f'atan({user_number}) = {result}' #atan
        elif user_input == '7':
            result = math.log(float(user_number))
            temp = f'ln({user_number}) = {result}' #ln
        elif user_input == '8':
            result = math.sqrt(float(user_number))
            temp = f'sqrt({user_number}) = {result}' #sqrt
        elif user_input == '9':
            result = math.factorial(int(user_number))
            temp = f'factorial({user_number}) = {result}' #factorial
    elif user_input is not valid_response:
        temp = 'Invalid entry.'
    print(temp)
    results.append(temp)