Using a class instance inside itself
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Is it considered bad practice to use a class inside itself?
For instance:
class Foo:
def __init__(self, b=None):
"""
b (Foo|None): instance of Foo.
"""
self.a = 'hello'
if isinstance(b, Foo):
print(b.a)
python
asked Jan 3 at 21:02
BiBiBiBi
1,89911436
add a comment |
Is it considered bad practice to use a class inside itself?
For instance:
class Foo:
def __init__(self, b=None):
"""
b (Foo|None): instance of Foo.
"""
self.a = 'hello'
if isinstance(b, Foo):
print(b.a)
python
asked Jan 3 at 21:02
BiBiBiBi
1,89911436
add a comment |
Is it considered bad practice to use a class inside itself?
For instance:
class Foo:
def __init__(self, b=None):
"""
b (Foo|None): instance of Foo.
"""
self.a = 'hello'
if isinstance(b, Foo):
print(b.a)
python
asked Jan 3 at 21:02
BiBiBiBi
1,89911436
Is it considered bad practice to use a class inside itself?
For instance:
class Foo:
def __init__(self, b=None):
"""
b (Foo|None): instance of Foo.
"""
self.a = 'hello'
if isinstance(b, Foo):
print(b.a)
python
python
asked Jan 3 at 21:02
BiBiBiBi
1,89911436
asked Jan 3 at 21:02
BiBiBiBi
1,89911436
asked Jan 3 at 21:02
BiBiBiBi
1,89911436
asked Jan 3 at 21:02
BiBiBiBi
1,89911436
asked Jan 3 at 21:02
BiBiBiBi
1,89911436
1,89911436
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
No. There's no point in going out of your way to use a class inside itself but if it solves your problem then go for it. For example python's standard library OrderedDict has an instance where it uses itself inside it's own definition:
def __eq__(self, other):
'''od.__eq__(y) <==> od==y. Comparison to another OD is order-sensitive
while comparison to a regular mapping is order-insensitive.
'''
if isinstance(other, OrderedDict):
return len(self)==len(other) and
all(_imap(_eq, self.iteritems(), other.iteritems()))
return dict.__eq__(self, other)
answered Jan 3 at 21:05
PrimusaPrimusa
8,04021032
add a comment |
No, it's fine. This is actually a pretty common pattern for implementing something like a tree or linked list node.
answered Jan 3 at 21:05
Daniel PrydenDaniel Pryden
47.3k975117
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
No. There's no point in going out of your way to use a class inside itself but if it solves your problem then go for it. For example python's standard library OrderedDict has an instance where it uses itself inside it's own definition:
def __eq__(self, other):
'''od.__eq__(y) <==> od==y. Comparison to another OD is order-sensitive
while comparison to a regular mapping is order-insensitive.
'''
if isinstance(other, OrderedDict):
return len(self)==len(other) and
all(_imap(_eq, self.iteritems(), other.iteritems()))
return dict.__eq__(self, other)
answered Jan 3 at 21:05
PrimusaPrimusa
8,04021032
add a comment |
No. There's no point in going out of your way to use a class inside itself but if it solves your problem then go for it. For example python's standard library OrderedDict has an instance where it uses itself inside it's own definition:
def __eq__(self, other):
'''od.__eq__(y) <==> od==y. Comparison to another OD is order-sensitive
while comparison to a regular mapping is order-insensitive.
'''
if isinstance(other, OrderedDict):
return len(self)==len(other) and
all(_imap(_eq, self.iteritems(), other.iteritems()))
return dict.__eq__(self, other)
answered Jan 3 at 21:05
PrimusaPrimusa
8,04021032
add a comment |
No. There's no point in going out of your way to use a class inside itself but if it solves your problem then go for it. For example python's standard library OrderedDict has an instance where it uses itself inside it's own definition:
def __eq__(self, other):
'''od.__eq__(y) <==> od==y. Comparison to another OD is order-sensitive
while comparison to a regular mapping is order-insensitive.
'''
if isinstance(other, OrderedDict):
return len(self)==len(other) and
all(_imap(_eq, self.iteritems(), other.iteritems()))
return dict.__eq__(self, other)
answered Jan 3 at 21:05
PrimusaPrimusa
8,04021032
No. There's no point in going out of your way to use a class inside itself but if it solves your problem then go for it. For example python's standard library OrderedDict has an instance where it uses itself inside it's own definition:
def __eq__(self, other):
'''od.__eq__(y) <==> od==y. Comparison to another OD is order-sensitive
while comparison to a regular mapping is order-insensitive.
'''
if isinstance(other, OrderedDict):
return len(self)==len(other) and
all(_imap(_eq, self.iteritems(), other.iteritems()))
return dict.__eq__(self, other)
answered Jan 3 at 21:05
PrimusaPrimusa
8,04021032
answered Jan 3 at 21:05
PrimusaPrimusa
8,04021032
answered Jan 3 at 21:05
PrimusaPrimusa
8,04021032
answered Jan 3 at 21:05
PrimusaPrimusa
8,04021032
8,04021032
add a comment |
add a comment |
No, it's fine. This is actually a pretty common pattern for implementing something like a tree or linked list node.
answered Jan 3 at 21:05
Daniel PrydenDaniel Pryden
47.3k975117
add a comment |
No, it's fine. This is actually a pretty common pattern for implementing something like a tree or linked list node.
answered Jan 3 at 21:05
Daniel PrydenDaniel Pryden
47.3k975117
add a comment |
No, it's fine. This is actually a pretty common pattern for implementing something like a tree or linked list node.
answered Jan 3 at 21:05
Daniel PrydenDaniel Pryden
47.3k975117
No, it's fine. This is actually a pretty common pattern for implementing something like a tree or linked list node.
answered Jan 3 at 21:05
Daniel PrydenDaniel Pryden
47.3k975117
answered Jan 3 at 21:05
Daniel PrydenDaniel Pryden
47.3k975117
answered Jan 3 at 21:05
Daniel PrydenDaniel Pryden
47.3k975117
answered Jan 3 at 21:05
Daniel PrydenDaniel Pryden
47.3k975117
47.3k975117
add a comment |
add a comment |
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