Function within Function Python

Question

This function converts celsius to fahrenheit

def celsius_to_fahrenheit (ctemp):
        temp_convert_to_fahr=int((ctemp+32)*1.8)

This function prints the celsius to fahrenheit table

def print_celsius_to_fahrenheit_conversion_table(min,max):
    print("Celsius\tFahrenheit")
    print("------------------")
    for num  in range (min,max):
            tempc=num
            tempf= celsius_to_fahrenheit(tempc)
            print(tempc,"\t",tempf)

This function converts from fahrenheit to celsius

def fahrenheit_to_celsius(tempf):
    f_to_c=int((tempf-32)/1.8)

This function prints the fahrenheit to celsius table

def print_fahrenheit_to_celsius_conversion_table(min,max):
    print("Fahrenheit\tCelsius")
    print("------------------")
    for num in range (min,max):
            tempf=num
            tempc= fahrenheit_to_celsius(tempf)
            print(tempf,"\t",tempc)
print()
print_celsius_to_fahrenheit_conversion_table(0,11)
print()
print_fahrenheit_to_celsius_conversion_table(32,41)

Every time I run this, my column that is being converted shows up as "none", any help as to what is wrong?

Open and shut case, thanks guys, that was so simple I'm a little embarrassed. — Mikey Durocher
– Mikey Durocher, Commented Mar 27, 2016 at 10:56

zondo · Accepted Answer · 2016-03-27 10:49:35Z

2

You are just assigning variables in your functions. You aren't returning anything. Just change f_to_c= and temp_convert_to_fahr= to return:

def celsius_to_fahrenheit (ctemp):
    return int((ctemp+32)*1.8)

def fahrenheit_to_celsius(tempf):
    return int((tempf-32)/1.8)

Since you don't return anything explicitly, the functions return None implicitly.

answered Mar 27, 2016 at 10:49

zondo

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Comments

Rob Murray · Accepted Answer · 2016-03-27 10:49:39Z

0

When you want to get the value from a function you need to return the value from the function explicitly, otherwise Python automatically does return None.

Here's the corrected functions:

def celsius_to_fahrenheit (ctemp):
    temp_convert_to_fahr=int((ctemp+32)*1.8)
    return temp_convert_to_fahr

def fahrenheit_to_celsius(tempf):
    f_to_c=int((tempf-32)/1.8)
    return f_to_c

answered Mar 27, 2016 at 10:49

Rob Murray

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Comments

Ankanna · Accepted Answer · 2016-03-27 10:53:55Z

0

missing return statements in the functions

def celsius_to_fahrenheit (ctemp):
    temp_convert_to_fahr=int((ctemp+32)*1.8)
    return temp_convert_to_fahr

def fahrenheit_to_celsius(tempf):
        f_to_c=int((tempf-32)/1.8)
       return f_to_c

or

 def celsius_to_fahrenheit (ctemp):
        return int((ctemp+32)*1.8)  
def fahrenheit_to_celsius(tempf):
       return int((tempf-32)/1.8)

answered Mar 27, 2016 at 10:53

Ankanna

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