Please provide resolution this error.

Question

import os
import pandas as pd
os.chdir("E:\data_sets")

cars_data = pd.read_csv('Toyota.csv',index_col=0,na_values=["??","????"])
cars_data1 = cars_data.copy(deep=False)

cars_data1.insert(10,"Price_Class","")

i=0
while i < len(cars_data1['Price']):
if(cars_data1['Price'][i] <= 8450):
cars_data1['Price_Class'][i]="Low"
elif(cars_data1['Price'][i] > 11950):
cars_data1['Price_Class'][i]="High"
else:
cars_data1['Price_Class'][i]="Medium"
i=i+1

cars_data1.columns

Getting below error in the code:
__main__:6: SettingWithCopyWarning:
A value is trying to be set on a copy of a slice from a DataFrame

See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy
__main__:4: SettingWithCopyWarning:
A value is trying to be set on a copy of a slice from a DataFrame

See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy
__main__:8: SettingWithCopyWarning:
A value is trying to be set on a copy of a slice from a DataFrame

See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy

Answer 1

I think you have to recheck the top one

Answer 2

The first thing you should understand is that SettingWithCopyWarning is a warning, and not an error. The real problem behind the warning is that it is generally difficult to predict whether a view or a copy is returned. In most cases, the warning was raised because you have chained two indexing operations together. The SettingWithCopyWarning was created to flag "chained assignment" operations. This is made easier to spot because you might be used [] (square brackets) twice, but the same would be true if you used other access methods such as .loc[] , .iloc[] and so on.

Moreover, you can change the behaviour of SettingWithCopyWarning warning using pd.options.mode.chained_assignment with three option "None/raise"/"warn".

http://net-informations.com/ds/err/copy.htm