class variables python

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answer class variables python

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class variables python

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# Class with class variables
class MyClass:
    # Class variable
    my_var = 10
    
    def __init__(self):
        self.instance_var = 20

# Accessing class variable
print(MyClass.my_var)

# Creating instances of class
obj1 = MyClass()
obj2 = MyClass()

# Accessing instance variable
print(obj1.instance_var)
print(obj2.instance_var)

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Contributed on Sep 12 2023

YOU.com

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class Foo:
    num_of_foos = 0     # class variable, shared by all instances
    raise_amt = 1.04    # class variable
    def __init__(self, x):
        self.instance_var = x
        Foo.num_of_foos += 1    # class safe way to use class variable
    def raise_me(self):
        # self.raise_amt allows object / subclass to override class variable
        return self.instance_var * self.raise_amt   

bar = Foo(1)
baz = Foo(1)
Foo.num_of_foos     # 2
bar.num_of_foos     # 2
bar.raise_me()      # 1.04
bar.raise_amt = 1.5 # create instance variable that overrides class variable
bar.raise_me()      # 1.5

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Contributed on Oct 23 2022

Grotesque Gibbon

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class variable in python

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# Class variables refer to variables that are made within a class.
# It is generated when you define the class.
# It's shared with all the instance of that class.
# Example:

class some_variable_holder(object):
    
    var = "This variable is created inside the class some_variable_holder()."
    
    def somefunc(self):
        print("Random function ran.")

thing = some_variable_holder()
another_thing = some_variable_holder()

# Both does the same thing because the same variable has been passed on from the class.
thing.var
another_thing.var

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Contributed on Aug 27 2020

Random boi

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python class variables

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# Class definition with a class variable
class MyClass:
    # Class variable
    class_variable = "This is a class variable"

    def __init__(self):
        # Instance variable
        self.instance_variable = "This is an instance variable"

# Accessing class variable directly using the class name
print(MyClass.class_variable)

# Creating an instance of MyClass
obj = MyClass()
# Accessing class variable using the instance
print(obj.class_variable)

# Modifying the class variable using the class name
MyClass.class_variable = "Updated class variable"
print(MyClass.class_variable)
print(obj.class_variable)  # Note that instance variable remains the same

# Modifying the class variable using the instance
obj.class_variable = "Modified class variable through instance"
print(MyClass.class_variable)  # Note that class variable remains unchanged
print(obj.class_variable)

# Output:
# This is a class variable
# This is a class variable
# Updated class variable
# Updated class variable
# Updated class variable
# Modified class variable through instance

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Contributed on Sep 12 2023

YOU.com

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class variables python

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