英文文档:isinstance(object, classinfo)Return true if the object argument is an instance of the classinfo argument, or of a (direct, indirect or virtual) subclass thereof. If object is not an object of the...
简介官方描述:Functional tools for creating and using iterators.即用于创建高效迭代器的函数。itertools.chain(*iterable)将多个序列作为一个单独的序列返回。例如:import itertoolsfor each in itertools.chain('i', ...