It looks like that jupyter read my file DataP4. However, once i start using codes, it says that name DataP4 is not defined. what is the issue? tried to solve it but failed.

import pandas as pd import seaborn as sns import statsmodels.formula.api as smf import statsmodels.api as sm import matplotlib.pyplot as plt import numpy as np from statsmodels.graphics.gofplots import qqplot_2samples, qqplot import scipy.stats df= pd.read_csv('DataP4.csv') import seaborn as sns from sklearn.preprocessing import LabelEncoder \#\# Variable Selection corr_mat=DataP4.corr(method='spearman ', numeric_only="True") upper_corr_mat = corr_mat.where ( np.triu(np.ones(corr_mat.shape), k=1). astype(np.bool)) \# Convert to 1-D series d drop Null values unique_corr_pairs = upper_corr_mat.unstack().dropna() NameError Traceback (most recent call last) Cell In[48], line 5 2 from sklearn.preprocessing import LabelEncoder 4 \#\#\# Variable Selection ---> 5 corr_mat=DataP4.corr(method='spearman', numeric_only="True") 6 upper_corr_mat = corr_mat. where ( 8 \# Convert to 1D series and drop Null values NameError: name 'DataP4' is not defined