如何将多列合并为一列并省略0？

import pandas as pd

# 创建一个示例DataFrame
df = pd.DataFrame({'col1': [1, 2, 3, 0, 5],
                   'col2': [0, 0, 0, 4, 0],
                   'col3': [6, 7, 0, 8, 9]})

# 合并多列为一列并省略0
df['merged_column'] = df['col1'].astype(str) + df['col2'].astype(str) + df['col3'].astype(str)
df['merged_column'] = df['merged_column'].apply(lambda x: x.replace('0', ''))

print(df)

   col1  col2  col3 merged_column
0     1     0     6            16
1     2     0     7            27
2     3     0     0             3
3     0     4     8            48
4     5     0     9            59