You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
49 lines
1.0 KiB
49 lines
1.0 KiB
# duck typing example taken from wikipedia
|
|
# https://de.wikipedia.org/wiki/Duck-Typing
|
|
|
|
|
|
class Bird:
|
|
"Birds have a name that they return in string represention"
|
|
|
|
def __init__(self, name):
|
|
self.name = name
|
|
|
|
def __str__(self):
|
|
return self.__class__.__name__+' '+self.name
|
|
|
|
|
|
class Duck(Bird):
|
|
"Ducks are birds which can quak"
|
|
|
|
def quak(self):
|
|
print(str(self)+': quak')
|
|
|
|
|
|
class Frog:
|
|
"Frogs also can quak"
|
|
|
|
def quak(self):
|
|
print(str(self)+': quak')
|
|
|
|
|
|
def main():
|
|
|
|
ducks = [Bird('Gustav'), Duck('Donald'), object()]
|
|
for duck in ducks:
|
|
# exception handling when object hasn't quak method
|
|
try:
|
|
duck.quak()
|
|
except AttributeError:
|
|
print('No duck:', duck)
|
|
|
|
ducks.append(Frog())
|
|
for duck in ducks:
|
|
# we also can use hasattr() function instead of exception handling
|
|
if hasattr(duck, 'quak'):
|
|
duck.quak()
|
|
else:
|
|
print('No duck:', duck)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|