Let's consider this problem. Given a patient's temperature in Fahrenheit and the hour of day when the temperature was taken, return whether the patient has a fever according to Harrison's internal medicine textbook.

Does this sound familiar? Recall our previously defined function:

In [2]:

```
def check_fever(temp, hour_of_day):
""" (number, int) -> str
Return 'fever' if the temperature temp in degrees Celsius recorded at hour_of_day
using the 24 hour clock) meets Harrison's definition of a fever, and 'no fever' otherwise.
>>> check_fever(37.5, 9)
'fever'
>>> check_fever(37.5, 14)
'no fever'
"""
if 0 <= hour_of_day <= 11 and temp > 37.2:
return 'fever'
elif 12 <= hour_of_day <=23 and temp > 37.7:
return 'fever'
else:
return 'no fever'
```

In [4]:

```
def fahrenheit_to_celsius(temp):
""" (number) -> float
Return the temperature temp converted from degrees Fahrenheit to Celsius.
>>> fahrenheit_to_celsius(32)
0.0
"""
return (temp - 32) * 5 / 9
```

Now, let's get back to solving the original problem. Much of the work has already been done, so we should take advantage of that.

We will define a new function `check_fever_fahrenheit`

that works the same as `check_fever`

, but the argument to it will be a temperature in degrees Fahrenheit, not Celsius. In the body of the function, we will call on `check_fever`

and `fahrenheit_to_celsius`

, rather than defining the function from scratch.

In [7]:

```
def check_fever_fahrenheit(temp, hour_of_day):
""" (number, int) -> str
Return 'fever' if the temperature temp in degrees Fahrenheit recorded at hour_of_day
using the 24 hour clock) meets Harrison's definition of a fever, and 'no fever' otherwise.
>>> check_fever_fahrenheit(99.5, 9)
'fever'
>>> check_fever_fahrenheit(99.5, 14)
'no fever'
"""
celsius = fahrenheit_to_celsius(temp)
return check_fever(celsius, hour_of_day)
```

In [10]:

```
check_fever_fahrenheit(99.5, 9)
```

Out[10]:

In [11]:

```
check_fever_fahrenheit(99.5, 14)
```

Out[11]:

We could also simplify the body of `check_fever_fahrenheit`

even more, by combining the two statments:

`return check_fever(fahrenheit_to_celsius(temp), hour_of_day)`