DataFrame选择单列

import pandas as pd

# 创建示例 DataFrame
data = {
    'A': [1, 2, 3],
    'B': ['a', 'b', 'c']
}
df = pd.DataFrame(data)

# 选择单列 'A'
column_A = df['A']
print(column_A)

# 选择单列 'A'
column_A = df.A
print(column_A)