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# Exceptions – Řešení 

Possible solution for the calculator:

```while True:
try:
side = float(input('Enter the side of a square in centimeters: '))
except ValueError:
print('That was not a number!')
else:
if side <= 0:
print('That does not make sense!')
else:
break

print("The perimeter of a square with a side of", side,"cm is ", side * 4,"cm.")
print("The area of a square with a side of", side,"cm is", side * side, "cm2.")
```

Possible solution for 1-D ticktactoe:

```def load_number(field):
while True:
try:
position = int(input('Which position do you want to fill? (0..19) '))
except ValueError:
print('This is not a number!')
else:
if position < 0 or position >= len(field):
print('You can not play outside the field!')
elif field[position] != '-':
print('That position is not free!')
else:
break

field = field[:position] + 'o' + field[position + 1:]
return field

print(player_move('-x----'))
```

Toto je stránka lekce z kurzu, který probíhá nebo proběhl naživo s instruktorem.