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# Python App to Convert temperature in Fahrenheit to Celsius.

I made a function that takes one argument (fah) which is the degree in Fahrenheit

```def fah_to_cel(fah):
# (32°F − 32) × 5/9 = 0°C
cel = (fah -32) * 5 / 9

return cel```

I used the equation of converting Fahrenheit to Celsius in the above function.

Then, I use input() funtion to get the temperature degree in Fahrenheit from user and and flaot() function to convert it from string to float, so I can use it in calculation in the function.

I put my code in try...except to check if the user input can be converted to float or not, and not crashed by wrong input data, if it can converted the program continue executing, if not it will print a message to the user.

Then I call my function with the user input to get the temperature in Celsius.

Finally I return the result which is the temperature degree in Celsius.

```print("Enter temperature in Fahrenheit")
try:
fah = float(input())

cel = fah_to_cel(fah)

print("The temperature " + str(fah) + " in Fahrenheit = " + str(cel) + " in Celsius.")

except ValueError:
print("The temperature degree you entered not a number")```

The complete code is here:

```def fah_to_cel(fah):
# (32°F − 32) × 5/9 = 0°C
cel = (fah -32) * 5 / 9

return cel

print("Enter temperature in Fahrenheit")
try:
fah = float(input())

cel = fah_to_cel(fah)

print("The temperature " + str(fah) + " in Fahrenheit = " + str(cel) + " in Celsius.")

except ValueError:
print("The temperature degree you entered not a number")```