如何在panda列中搜索前缀，如果找到，则在新列中返回下11个字符的prefix+the？

import pandas as pd

data = {'panda': ['prefix1', 'prefix2', 'prefix3', 'other']}
df = pd.DataFrame(data)

prefix = 'prefix'
df['new_column'] = df[df['panda'].str.startswith(prefix)]['panda'].str.slice(0, 11)

import pandas as pd

data = {'panda': ['prefix1', 'prefix2', 'prefix3', 'other']}
df = pd.DataFrame(data)

prefix = 'prefix'
df['new_column'] = df[df['panda'].str.startswith(prefix)]['panda'].str.slice(0, 11)

print(df)

     panda new_column
0  prefix1  prefix1the
1  prefix2  prefix2the
2  prefix3  prefix3the
3    other        NaN