寻找最大回文字符串(python)

A = "fccf edfgfde"max_sub = []for i in range(len(A)-1):    tmp = []    if A[i]==A[i+1]:        tmp.append(A[i])        tmp.append(A[i+1])        j = 1        while i-j>=0 and i+1+j<len(A)-1:            lc = A[i-j]            rc = A[i+1+j]            if lc==rc:                tmp.insert(0, lc)                tmp.append(rc)            j += 1    if len(tmp)>len(max_sub): max_sub = tmp    if i>1 and A[i-1]==A[i+1]:        tmp.append(A[i])        j = 1        while i-j>0 and i+j<len(A)-1:            lc = A[i-j]            rc = A[i+j]            if lc==rc:                tmp.insert(0, lc)                tmp.append(rc)            j += 1    if len(tmp)>len(max_sub): max_sub = tmpprint(max_sub)