What makes composition an important feature of OOP (python)?
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What makes composition an important feature of OOP (python)?
$begingroup$
I am going through a python design pattern book and just ran across the mentioning of composition as an important feature of OOP. The following description caught my eye:
In composition, an object is used to call member functions in other modules thereby making base functionality available across modules without inheritance
The associated example is straightforward, but what puzzles me is more basic: why is this an important feature? Without reading this, I'd have taken this feature for granted--shouldn't we always be able to use a function/method inside another function? Why is this viewed as an OOP feature? Are there counter examples that make this non-trivial to do? Thanks!
class A(object):
def a1(self):
print('a1')
class B(object):
def b(self):
print('b')
A().a1()
# Example of class B accessing member function of
# A without inheritance
python-3.x object-oriented design-patterns
asked 2 mins ago
Shan DouShan Dou
1011
New contributor
Shan Dou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
$begingroup$
I am going through a python design pattern book and just ran across the mentioning of composition as an important feature of OOP. The following description caught my eye:
In composition, an object is used to call member functions in other modules thereby making base functionality available across modules without inheritance
The associated example is straightforward, but what puzzles me is more basic: why is this an important feature? Without reading this, I'd have taken this feature for granted--shouldn't we always be able to use a function/method inside another function? Why is this viewed as an OOP feature? Are there counter examples that make this non-trivial to do? Thanks!
class A(object):
def a1(self):
print('a1')
class B(object):
def b(self):
print('b')
A().a1()
# Example of class B accessing member function of
# A without inheritance
python-3.x object-oriented design-patterns
asked 2 mins ago
Shan DouShan Dou
1011
New contributor
Shan Dou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
$begingroup$
I am going through a python design pattern book and just ran across the mentioning of composition as an important feature of OOP. The following description caught my eye:
In composition, an object is used to call member functions in other modules thereby making base functionality available across modules without inheritance
The associated example is straightforward, but what puzzles me is more basic: why is this an important feature? Without reading this, I'd have taken this feature for granted--shouldn't we always be able to use a function/method inside another function? Why is this viewed as an OOP feature? Are there counter examples that make this non-trivial to do? Thanks!
class A(object):
def a1(self):
print('a1')
class B(object):
def b(self):
print('b')
A().a1()
# Example of class B accessing member function of
# A without inheritance
python-3.x object-oriented design-patterns
asked 2 mins ago
Shan DouShan Dou
1011
New contributor
Shan Dou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
I am going through a python design pattern book and just ran across the mentioning of composition as an important feature of OOP. The following description caught my eye:
In composition, an object is used to call member functions in other modules thereby making base functionality available across modules without inheritance
The associated example is straightforward, but what puzzles me is more basic: why is this an important feature? Without reading this, I'd have taken this feature for granted--shouldn't we always be able to use a function/method inside another function? Why is this viewed as an OOP feature? Are there counter examples that make this non-trivial to do? Thanks!
class A(object):
def a1(self):
print('a1')
class B(object):
def b(self):
print('b')
A().a1()
# Example of class B accessing member function of
# A without inheritance
python-3.x object-oriented design-patterns
python-3.x object-oriented design-patterns
asked 2 mins ago
Shan DouShan Dou
1011
New contributor
Shan Dou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 mins ago
Shan DouShan Dou
1011
New contributor
Shan Dou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 mins ago
Shan DouShan Dou
1011
New contributor
Shan Dou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 mins ago
Shan DouShan Dou
1011
asked 2 mins ago
Shan DouShan Dou
1011
1011
New contributor
Shan Dou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Shan Dou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Shan Dou is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
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