Python Experience Basics "7" Object-oriented correlation

Other related

One, isinstance (obj, CLS)

Checks if obj is an object of class CLS

1 class Foo (object): 2     Pass 3  4 obj = foo ()5  6 isinstance (obj, foo)

Second, Issubclass (sub, super)

Check if the sub class is a derived class of super class

1 class Foo (object): 2     Pass 3  4 class Bar (Foo): 5     Pass 6  7 Issubclass (Bar, Foo)

Third, exception handling

1. Abnormal Foundation

In the programming process in order to increase the friendliness of the program in the event of a bug will not be displayed to the user error message, but the reality of a hint of the page, popular is not to let users see the big Yellow Pages!!!

1 Try : 2     Pass 3 except Exception,ex: 4     Pass

Requirement: Add two numbers entered by the user

1  whileTrue:2NUM1 = Raw_input ('NUM1:')3num2 = Raw_input ('num2:')4     Try:5NUM1 =Int (NUM1)6num2 =Int (num2)7result = Num1 +num28     exceptException, E:9         Print 'An exception occurred with the following information:'Ten         PrintE

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Python Experience Basics "7" Object-oriented correlation