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between regression testing and unit testing?Chapter IIIThis chapter is mainly from the measurement and development of personal ability and the professional development of software engineering, the understanding of general software design thought and the engineering idea, the promotion of professional skills and the actual results achieved. Become a software engineer, first of all to learn and accumulate software development-related knowledge, continuous learning, and constantly accumulate, impr

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the value corresponding to the key, does not exist when the output can be specified, default is emptyD.get (K[,d]), D[k] if k in D, else D. D defaults to None. Has_key () to see if key existsD.has_key (k)-True if D has a key k, else False Iitems () converted to a list of (key, value)D.items (), List of D ' s (key, value) pairs, as 2-tuples Copy () copyingD.copy (), a shallow copy of D Clear () Empty dictionaryD.clear (), None. Remove all item

captured instead of its value when the delegate instance is created. The lifetime of the captured variable is extended, at least as long as the delegate that captures it. Multiple delegates can capture the same variable ... ...... But inside the loop, the same variable declaration actually refers to a different "instance" of the variable. The variables created in the declaration of the For Loop are valid only during the duration of the loop-not instantiated at each iteration of