Hello everyone! I hope you all have a great weekend!

I have a trouble with this work. The output doesn’t make send when I apply the value.

Any help is great. Thank you so much!

# Python error

**mtf**#2

On something like this it is often simpler if we abstract away the simple functions.

```
from math import pi
def get_number():
while True:
try:
return int(input("Enter a number: "))
except ValueError:
print ("Invalid input. Try again...")
def square():
print ("Length of a side...")
n = get_number()
return "Square with side length {} has a perimeter of {} \
and an area of {}.".format(n, 4 * n, n ** 2)
def circle():
print ("Length of radius...")
r = get_number()
return "Circle with radius length {} has a circumferance of {:f} \
and an area of {:f}.".format(r, 2 * pi * r, pi * r ** 2)
print (square())
print (circle())
```

```
Length of a side...
Enter a number: 5
Square with side length 5 has a perimeter of 20 and an area of 25.
Length of radius...
Enter a number: 5
Circle with radius length 5 has a circumferance of 31.415927 and an area of 78.539816.
```

That’s three functions out of the way. You could fashion one to accept textual input, but if you are using numbers for menu items, then use get_number and test the value on return. Just as `get_number`

uses an infinite loop, yours could also for this purpose.

Once you have lightened the load of your main program, the rest should fall into place.