如何比较python中的两列字符串？

Question

My CSV file contains 20 columns and I need to take data of only those addresses that are relevant to my study, so I compare the column containing all addresses to a column containing only specific address.

I am getting "key error' saying the index selected_city does not exist:

import csv
import os
import pandas as pd
data_new = pd.read_csv('file1.csv', encoding= "ISO-8859–1")
print(data_new)
for i in rows:
    if str(data.loc['selected_city'] == data.loc['Charge_Point_City'])
print(data.Volume,data.Charge_Point_City)

Answer 1

Consider using the builtin function .isin() .

For example:

s = pd.Series(['a','b','c', 'b','c','a','b'])

So now s looks like:

0    a
1    b
2    c
3    b
4    c
5    a
6    b

Say you only want to keep the rows where s is in a smaller series:

smol = pd.Series(['a','b'])
s[s.isin(smol)]

Output:

0    a
1    b
3    b
5    a
6    b

For your specific use case, you probably want

data = data[data['selected_city'].isin(data['Charge_Point_City'])]