如果pandas中已知列(或索引)，如何返回值的索引(或列)标签

import pandas as pd

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

# 已知列为'B'，返回值的索引标签
known_column = 'B'
index_labels = df.columns.get_indexer([known_column])
print(index_labels)

[1]

import pandas as pd

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

# 已知索引为1，返回值的列标签
known_index = 1
column_labels = df.index.get_indexer([known_index])
print(column_labels)

[1]