jupyter notebook出现这种情况的原因如何解决？

Question

corr_df = data2.corr()
corr_df[corr_df == 1] = nan
corr_df = pd.DataFrame(corr_df.max().sort_values(ascending=False).head(20), columns=['corr'])
corr_df['name'] = [get_security_info(code).display_name for code in corr_df.index]
corr_df

NameError Traceback (most recent call last)
in
2
3 corr_df = data2.corr()
----> 4 corr_df[corr_df == 1] = nan
5 corr_df = pd.DataFrame(corr_df.max().sort_values(ascending=False).head(20), columns=['corr'])
6 corr_df['name'] = [get_security_info(code).display_name for code in corr_df.index]

NameError: name 'nan' is not defined

Answer 1

在前面加一句

from numpy import nan