#%%
def fahrenheit_to_celsius1():
    """ BAD. Does not check input before using it.
    Input from keyboard, which is always a string and must often be
    converted to an int or float.
    Converts Fahrenheit temp to Celsius.
    """

    temp_str = input("Enter a Fahrentheit temperature: ")
    temp = int(temp_str)
    newTemp = 5*(temp-32)/9
    print("The Fahrenheit temperature",temp,"is equivalent to ",end='')
    print(newTemp,"degrees Celsius")

fahrenheit_to_celsius1()
#%%
"""
Test the program above by entering a temperature such as 212. Also check what
happens if you simply press enter.
"""

def fahrenheit_to_celsius2():
    """ IMPROVED. Does some checking of input before using it.
    Input from keyboard, which is always a string and must often be
    converted to an int or float.
    Converts Fahrenheit temp to Celsius.
    Uses 'if' to make sure an entry was made.
    """

    temp_str = input("Enter a Fahrenheit temperature: ")
    if temp_str:
        temp = int(temp_str)
        newTemp = 5*(temp-32)/9
        print("The Fahrenheit temperature",temp,"is equivalent to ",end='')
        print(newTemp,"degrees Celsius")