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Like Smalltalk, in Objective-C, the instance variables and methods are defined by an object's class. A class is an object, hence it is an instance of a metaclass. Like Smalltalk, in Objective-C, class methods are simply methods called on the class object, hence a class's class methods must be defined as instance methods in its metaclass.
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The most important usage of PyObjC is enabling programmers to create GUI applications using Cocoa libraries in pure Python. [2] Moreover, as an effect of Objective-C's close relationship with the C programming language (it is a pure superset), developers are also able to incorporate any C-based API by wrapping it with an Objective-C wrapper and then using the wrapped code over the PyObjC bridge.
Maine Central Railroad Class C locomotives were intended for main line passenger service. They were of 4-6-2 wheel arrangement in the Whyte notation , or " 2'C1' " in UIC classification . They replaced earlier class N 4-6-0 locomotives beginning in 1907.
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The class A serves as a base class for the derived class B, which in turn serves as a base class for the derived class C. The class B is known as intermediate base class because it provides a link for the inheritance between A and C. The chain ABC is known as inheritance path. A derived class with multilevel inheritance is declared as follows:
By default, a Pandas index is a series of integers ascending from 0, similar to the indices of Python arrays. However, indices can use any NumPy data type, including floating point, timestamps, or strings. [4]: 112 Pandas' syntax for mapping index values to relevant data is the same syntax Python uses to map dictionary keys to values.
Into the 1950s, the Bangor and Aroostook operated an afternoon train, the Aroostook Flyer, on the company's mainline from Bangor (where a connection could be made from the Boston & Maine's Penobscot from Boston [15]), to Brownville, Sherman, Oakfield, Presque Isle, Caribou and concluding in Van Buren (opposite St. Leonard in New Brunswick).