从熊猫数据框中检索值时将整数转换为字符串类型

Question

I am trying to convert output of data (from Integer to String) from a List generated using Pandas.

I got the output of data from a csv file.

Here is my code that covers expression using Pandas (excluding part where it shows how to come up with generation of object 'InFile' (csv file)).

import pandas as pd
....

with open(InFile) as fp:
     skip = next(it.ifilter(
        lambda x: x[1].startswith('ID'),
        enumerate(fp)
     ))[0]

dg = pd.read_csv(InFile, usercols=['ID'], skiprows=skip)
dgl = dg['ID'].values.tolist()

Currently, output is a List (example below).

 [111111, 2222, 3333333, 444444] 

I am trying to match data from other List (which is populated into String or Varchar(data type in MySQL), but somehow, I cannot come up with any match. My previous post -> How to find match from two Lists (from MySQL and csv)

So, I am guessing that the data type from the List generated by Pandas is an Integer .

So, how do I convert the data type from Integer to String?

Which line should I add something like str(10) , for an example?

Answer 1

You can use pd.Series.astype :

dgl = dg['ID'].astype(str).values.tolist()
print(dgl)

Output:

['111111', '2222', '3333333', '444444']