我有一个只有1/0的df。我想建立一个具有相同形状的df。我想考虑前两个1的情况下，我们有连续的1。例如，在一个情况下，我们有0，0，1，1，1，0，0我想把它转换为0，0，1，1，0，0，0，0。这里是一个例子，

import pandas as pd

df_dr = pd.DataFrame()
df_dr['0'] = [0,0]
df_dr['1'] = [1,0]
df_dr['2'] = [1,1]
df_dr['3'] = [1,1]
df_dr['4'] = [0,1]
df_dr['5'] = [1,0]
df_dr['6'] = [1,0]
df_dr['7'] = [1,0]
df_dr['8'] = [1,1]
df_dr['9'] = [0,1]
df_dr['10'] = [0,1]
df_dr['11'] = [0,1]
df_dr['12'] = [0,1]

字符串
这里是输出：

0   1   2   3   4   5   6   7   8   9   10  11  12
0   0   1   1   0   0   1   1   0   0   0   0   0   0
1   0   0   1   1   0   0   0   0   1   1   0   0   0

型
你能帮我吗？谢谢