用Jupyter出现了name 'df' is not defined的问题

Question

import numpy as np
import matplotlib.pyplot as plt
import scipy.io as sio
import seaborn as sb
import pandas as pd
from scipy.io import loadmat#abc
from scipy import stats
from ipykernel import kernelapp as app
from scipy.optimize import minimize

def load_data():
    df = loadmat('C:/Users/fiq/Desktop/ex5data1.mat')#载入数据
    return df['X'],df['y'],df['Xval'],df['yval'],df['Xtest'],df['ytest']

X,y,Xval,yval,Xtest,ytest = load_data()

def computeCost (X,y,theta):
    inner=np.power((X*theta.T)-y,2)
    #theta.T就是矩阵theta的转置矩阵
    #np.power(A,B)   ## 对A中的每个元素求B次方
    return np.sum(inner)/(2*len(X))
df.insert(0,'ONE',1)  #在第0列插入表头为“ONE”的列，数值为1

df.insert(0,'ONE',1)  #在第0列插入表头为“ONE”的列，数值为1
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-242-e766ad7db43f> in <module>
----> 1 df.insert(0,'ONE',1)  #在第0列插入表头为“ONE”的列，数值为1

NameError: name 'df' is not defined

这里出现了NameError: name 'df' is not defined

请问如何解决

Answer 1

你这个变量是在另一个方法里面定义的，你把df在main函数里定义就好了