Python is an object-oriented programming language. Almost everything in Python is an object, with its properties and methods. A Class is like an object constructor, or a "blueprint" for creating objects.
The variables that are defined outside the class can be accessed by any class or any methods in the class by just writing the variable name.
# defined outside the class' # Variable defined outside the class. outVar = 'outside_class' print("Outside_class1", outVar) ''' Class one ''' class Ctest: print("Outside_class2", outVar) def access_method(self): print("Outside_class3", outVar) # Calling method by creating object uac = Ctest() uac.access_method() ''' Class two ''' class Another_ Ctest_class: print("Outside_class4", outVar) def another_access_method(self): print("Outside_class5", outVar) # Calling method by creating object uaac = Another_ Ctest_class() uaac.another_access_method() The variables that are defined inside the methods can be accessed within that method only by simply using the variable name. # defined inside the method' '''class one''' class Ctest: print() def access_method(self): # Variable defined inside the method. inVar = 'inside_method' print("Inside_method3", inVar) uac = Ctest() uac.access_method() '''class two''' class AnotherCtest: print() def access_method(self): print() uaac = AnotherCtest() uaac.access_method()