for循环

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#for循环可以遍历任何序列sum=0for x in [1,2,3,4,5]:    sum+=xprint('sum=',sum)#遍历元组t=('you','and','me')for s in t:    print(s)#遍历字符串s="configure"for s1 in s:    print(s1)#遍历字典d={1:100,2:200,3:300}for key in d:    print(key,'-->',d[key])for (key ,value) in d.items():    print(key,'==>',value)l=[(1,2),(3,4),(5,6)]for both in l:    a,b=both    print(a,b)#遍历keys中的值是否存在于items中items=['xlk',111,(3,4),2.5]keys=[(3,4),3.14]for key in keys:    if key in items:        print(key,'was found')    else:        print(key,'was not found')    

                                             
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