1002 A+B for Polynomials (25 point(s))

if __name__=='__main__':
    a=input().split()
    a=[x for x in a]
    b=input().split()
    b=[x for x in b]
    # a=[2,1,2.4,7,3.2]
    # b=[2,2,1.5,1,0.5]
    num_a=int(a[0])
    num_b=int(b[0])
    a=a[1:]
    b=b[1:]
    result={}
    for i in range(0,num_a*2,2):
        # dict中填入数据
        result.update({a[i]:a[i+1]})
    for j in range(0,num_b*2,2):
        # 对result中的数据进行检索
        found=set(result)

        found=list(found)

        if found.count(b[j])==0:
            result.update({b[j]:b[j+1]})
        else:
            result.update({b[j]:float(result.get(b[j]))+float(b[j+1])})
    keys = list(sorted(result.items(), key=lambda d:d[0], reverse = True))
    count=len(keys)
    # print(count)
    # print(keys)
    # tuple转换为ｌｉｓｔ
    come=[]
    come.append(count)
    for w in keys:
        come.append(list(w)[0])
        come.append(list(w)[1])
    # print(come)
    for x, c in enumerate(come):
        print('{}'.format(come[x]), end=' ' if int(x) != len(come) - 1 else '')

# NO extra space at the end of each line

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