Python Foundation------Build an iterative object with the generator

#利用生成器生成一个可迭代对象
#需求: Generates an iterative object, outputs a prime number within a specified range, and uses the generator to produce an iterative object
#生成器: It is iterative in itself, but yield is like return, yield returns, function freezes state when re-tuned, starting from frozen state

1 classPrintnumbers (object):2     """docstring for Printnumbers"""3     def __init__(self, start,end):4Self.start =Start5Self.end =End6     defIsprimenum (self,num):7         ifnum==2:8             returnFalse9          forIinchRange (2, num):Ten             ifnum%i = =0: One                 returnFalse A         returnTrue -     def __iter__(self): -          forIinchRange (self.start,self.end+1): the             ifSelf.isprimenum (i): -                 yieldI -  -p = printnumbers (1,100) +  forIinchP: -     Print(i)

Slicing an iterator, similar to a list, returns the type of iteration that is still possible

1 Print("-------------slicing an iterator------------")2 #How to slice an iterator3  fromItertoolsImportIslice4 #The return is still an iterator that needs to be iterated5 " "6 islice (iterable,stop)7 islice (Iterable,start,stop[,step=1]), Islice object8 9 Ten " " OneA = Islice (p,1,3) A Print(a) -  forXinchA:

Python Foundation------Build an iterative object with the generator