Python iterators and generators

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1 #x= ' Hello '2 ## Print (dir (x))3 #iter_test=x.__iter__ ()4 #5 ## Print (iter_test)6 #print (iter_test.__next__ ())7 #print (iter_test.__next__ ())8 #print (iter_test.__next__ ())9 #print (iter_test.__next__ ())Ten #print (iter_test.__next__ ()) One  A # -l=[1,2,3] - #For i in L: #i_l =l.__iter_ () i_l.__next__ () the #print (i) -  - #index=0 - #While index < Len (l): + #print (L[index]) - #index+=1 +  A  at #iter_l=l.__iter__ () #遵循迭代器协议, generating an iterative object - #print (iter_l.__next__ ()) - #print (iter_l.__next__ ()) - # - #For i in L: - #print (i) in  - #s={1,2,3} to # + ## for I in S: - ## Print (i) the #iter_s=s.__iter__ () * #print (iter_s) $ #print (iter_s.__next__ ())Panax Notoginseng #print (iter_s.__next__ ()) - #print (iter_s.__next__ ()) the #print (iter_s.__next__ ()) +  A #dic={' A ': 1, ' B ': 2} the #iter_d=dic.__iter__ () + #print (iter_d.__next__ ()) -  $ #f=open (' test11.py ', ' r+ ') $ ## for I in F: - #iter_f=f.__iter__ () - #print (iter_f) the ## Print (iter_f.__next__ (), end= ") - #print (iter_f.__next__ (), end= ")Wuyi #l=[1,2,3,4,5] the #diedai_l=l.__iter__ () - #While True: Wu #Try: - #print (diedai_l.__next__ ()) About #except stopiteration: $ ## print (' iteration completed, loop terminated ') - # Break -  - #l=[' die ', ' Erzi ', ' Sunzi ', ' Chongsunzi '] A # + #iter_l=l.__iter__ () the #print (iter_l) - #print (iter_l.__next__ ()) $ #print (iter_l.__next__ ()) the #print (iter_l.__next__ ()) the #print (iter_l.__next__ ()) the #print (Next (iter_l)) #next ()---->iter_l.__next__ () the  -  in  the  the  About  the  the  the  +  - #def Test (): the #yield 1Bayi #yield 2 the #Yield 3 the #g=test () - #print (' From function ', g) - #print (g.__next__ ()) the #print (g.__next__ ()) the  the #Three -dimensional expression the #name= ' Alex ' - #name= ' Linhaifeng ' the #res= ' SB ' if name = = ' Alex ' Else ' handsome ' the #Print (res) the 94  the #List Parsing the #egg_list=[] the #For I in Range (Ten):98 #egg_list.append (' egg%s '%i) About #print (egg_list) - 101 #l=[' egg%s '%i for I in Range (Ten)]102 #l1=[' egg%s '%i for I in range (Ten) if I > 5]103 #ll = [' Egg '%s '%i for I in Range (Ten)]104 #lll = [' egg%s '%i for I in range (Ten) if I<5] the ## l1=[' egg%s '%i for I in range (Ten) if I > 5 else i] #没有四元表达式106 #l2=[' egg%s '%i for I in range (Ten) if I < 5] #没有四元表达式107 #108 ## Print (l)109 #print (L1) the #print (L2)111  the #laomuji= (' egg%s '%i for I in range) #生成器表达式113 #Laomuji = (' Dog egg%s '%i for I in Range ()) the #print (Laomuji) the # the #print (laomuji.__next__ ())117 #print (laomuji.__next__ ())118 #print (Next (Laomuji))119 #print (Next (Laomuji)) - #print (Next (Laomuji))121 #print (Next (Laomuji))122 #print (Next (Laomuji))123 #print (Next (Laomuji))124 #print (Next (Laomuji)) the #print (Next (Laomuji))126 127 #l=[1,2,3,34] - #map (func,l)129  the #Print (SUM (l))131 #print (sum ()) the #Print (SUM (i-I in range (10000)))133 Print(SUM (i forIinchRange (101)))

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Python iterators and generators