chapter13

Korzystaj z wyjątków!

Przykład 12.14: value_except

# dobrze
d = {'x': '5'}
try:
  value = int(d['x'])
except (KeyError, TypeError, ValueError):
  value = None
print(value)
# gorzej
d = {'x': '5'}
if 'x' in d and isinstance(d['x'], str) and d['x'].isdigit():
  value = int(d['x'])
else:
  value = None

Przykład 12.14a: value_except2

d = {'x': '5'}
try:
  value = int(d['x'])
except (KeyError, TypeError, ValueError):
  value = None
else:
 value=-1
finally:
  print(value)