How do I decode FTP file read from BytesIO

Question

I am trying to read the contents of text files on an FTP server, my code can make a connection and list all files present in the directory. However, it is failing here:

from io import BytesIO
import os

r = BytesIO()
ftp.retrbinary("RETR " + "textfile.txt", r)    
print (r)

This prints:

<_io.BytesIO object at 0x03C2CCF0>

Firstly I'm not entirely sure what this means so If someone could shed some light on that I would be grateful.

Also when I try the following code to decode the returned value I get this error:

TypeError: '_io.BytesIO' object is not callable

Code looks like this:

r = BytesIO()
ftp.retrbinary("RETR " + "textfile.txt", r)    
print (r.decode("utf-8"))

Kvothe · Answer 1 · 2019-09-16T11:36:40.780

1

Try r.write and r.getvalue()

from io import BytesIO
from ftplib import FTP
import os

ftp = FTP('ftp.test.org') 
ftp.login()

r = BytesIO()
ftp.retrbinary("RETR " + "textfile.txt", r.write)    
print (r.getvalue())

https://docs.python.org/3/library/io.html

edited Sep 16 '19 at 11:36

answered Sep 16 '19 at 09:48

Kvothe

110
4

BytesIO has no attribute `value` – EcSync Sep 16 '19 at 09:52
then take a look in the documentation. The function is "getvalue". – Kvothe Sep 16 '19 at 09:54
cheers, this still returns coded values and I don't know what they mean – EcSync Sep 16 '19 at 09:57
@EcSync So show us what exactly do you get. We cannot help otherwise. – Martin Prikryl Sep 16 '19 at 11:12
@MartinPrikryl it returns `` as I say, I do not know what this means, whether it is specific information or a generic result from the function i used. – EcSync Sep 16 '19 at 11:19
1

you have forgotten the round brackets in getValue() ? – Kvothe Sep 16 '19 at 11:34
Hi just wondering how to write unit test / mock this piece of code, especially the `BytesIO` bit? – wawawa Mar 03 '21 at 15:50

How do I decode FTP file read from BytesIO

1 Answers1