ValueError:输入包含NaN、infinity或对于dtype来说太大的值('float64

df1_fit=pd.DataFrame(scaled_features,columns=df1.columns[:-1])
df1_fit.head()

from sklearn.model_selection import train_test_split

X_train, X_test, y_train, 
y_test=train_test_split(scaled_features,df1['Sales'],test_size=0.30)

from sklearn.neighbors import KNeighborsClassifier

knn=KNeighborsClassifier(n_neighbors=5)
knn.fit(X_train,y_train)

然后我运行它，但是它显示，ValueError: Input包含NaN, infinity或者一个对于dtype来说太大的值('float64') 我怎么解它? 问题来源StackOverflow 地址：/questions/59382170/valueerror-input-contains-nan-infinity-or-a-value-too-large-for-dtypefloat64