Pandas to_csv另存为NoneType并提高TypeError

import pandas as pd

# 示例数据
data = {'col1': [1, 2], 'col2': [3, 4]}
df = pd.DataFrame(data)

# 检查DataFrame是否为None
if df is not None:
    df.to_csv('output.csv', index=False)
else:
    print("DataFrame is None")

import pandas as pd

# 示例数据
data = {'col1': [1, 2], 'col2': [3, 4]}
df = pd.DataFrame(data)

# 检查对象类型
if isinstance(df, pd.DataFrame):
    df.to_csv('output.csv', index=False)
else:
    print("Object is not a DataFrame")

import pandas as pd

# 示例数据
data = {'col1': [1, 2], 'col2': [3, 4]}
df = pd.DataFrame(data)

# 打印DataFrame信息
print(df.info())

# 检查DataFrame是否为None
if df is not None:
    df.to_csv('output.csv', index=False)
else:
    print("DataFrame is None")