I am getting an error when I am trying to excute this code

Question

SUMLEV REGION DIVISION ... RNETMIG2013 RNETMIG2014 RNETMIG2015 0 40 3 6 ... 1.383282 1.724718 0.712594 1 50 3 6 ... -2.722002 2.592270 -2.187333 2 50 3 6 ... 22.727626 20.317142 18.293499 3 50 3 6 ... -7.167664 -3.978583 -10.543299 4 50 3 6 ... -5.403729 0.754533 1.107861

import pandas as pd
import numpy as np
import timeit
df=pd.read_csv("census.csv")
print(df.head())



def second_approach():
     global df
     new_df=df[["SUMLEV"]==50]
     new_df.set_index(["STNAME","CTYNAME"],inplace=True)
     return (new_df.rename(columns={"ESTIMATESBASE2010":"Estimate Base 2010"}))
print(timeit.timeit(second_approach,number=10))

I can't detect what is getting wrong.Can anybody help? this is the error I am getting: Traceback (most recent call last):

File C:\ProgramData\anaconda3\lib\site-packages\pandas\core\indexes\base.py:3802 in get_loc return self._engine.get_loc(casted_key)

File pandas_libs\index.pyx:138 in pandas._libs.index.IndexEngine.get_loc

File pandas_libs\index.pyx:165 in pandas._libs.index.IndexEngine.get_loc

File pandas_libs\hashtable_class_helper.pxi:5745 in pandas._libs.hashtable.PyObjectHashTable.get_item

File pandas_libs\hashtable_class_helper.pxi:5753 in pandas._libs.hashtable.PyObjectHashTable.get_item

KeyError: False

The above exception was the direct cause of the following exception:

Traceback (most recent call last):

File C:\ProgramData\anaconda3\lib\site-packages\spyder_kernels\py3compat.py:356 in compat_exec exec(code, globals, locals)

File c:\users\96399\idioms.py:14 print(timeit.timeit(second_approach,number=10))

File C:\ProgramData\anaconda3\lib\timeit.py:234 in timeit return Timer(stmt, setup, timer, globals).timeit(number)

File C:\ProgramData\anaconda3\lib\timeit.py:178 in timeit timing = self.inner(it, self.timer)

File :6 in inner

File c:\users\96399\idioms.py:11 in second_approach new_df=df[["SUMLEV"]==50]

File C:\ProgramData\anaconda3\lib\site-packages\pandas\core\frame.py:3807 in getitem indexer = self.columns.get_loc(key)

File C:\ProgramData\anaconda3\lib\site-packages\pandas\core\indexes\base.py:3804 in get_loc raise KeyError(key) from err

KeyError: False