Writing CSV file into dataframe from FTPS server with python - python-3.x

Question

I am trying to get a csv file out of an ftps server. I am receiving this info, though:
file = r'filename.csv'
with ftplib.FTP() as ftp:
with open(file, 'rb') as f:
ftp.retrbinary(file, f.read)
df1= pd.read_csv(file)
df1.head()
with this particular error:
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-10-a2725f958d45> in <module>
4
5 with open(file, 'rb') as f:
----> 6 ftp.retrbinary(file, f.read)
7 df1= pd.read_csv(file) #delimiter = '|', encoding = 'latin1')
8 df1.head()
~\AppData\Local\Continuum\anaconda3\lib\ftplib.py in retrbinary(self, cmd, callback, blocksize, rest)
439 The response code.
440 """
--> 441 self.voidcmd('TYPE I')
442 with self.transfercmd(cmd, rest) as conn:
443 while 1:
~\AppData\Local\Continuum\anaconda3\lib\ftplib.py in voidcmd(self, cmd)
275 def voidcmd(self, cmd):
276 """Send a command and expect a response beginning with '2'."""
--> 277 self.putcmd(cmd)
278 return self.voidresp()
279
~\AppData\Local\Continuum\anaconda3\lib\ftplib.py in putcmd(self, line)
197 def putcmd(self, line):
198 if self.debugging: print('*cmd*', self.sanitize(line))
--> 199 self.putline(line)
200
201 # Internal: return one line from the server, stripping CRLF.
~\AppData\Local\Continuum\anaconda3\lib\ftplib.py in putline(self, line)
192 if self.debugging > 1:
193 print('*put*', self.sanitize(line))
--> 194 self.sock.sendall(line.encode(self.encoding))
195
196 # Internal: send one command to the server (through putline())
AttributeError: 'NoneType' object has no attribute 'sendall'
Any ideas as to why this isn't putting the requested file into a dataframe?

Answer 1

the documentation says that the cmd argument of retrbinary method should be an appropriate RETR command: RETR filename and the callback function is called for each block of data received.
if you need to get data, write to file and read file try: ftp.retrbinary(f'RETR {file}', f.write)

Answer 2

Method Name:
retrbinary
retrbinary(cmd, callback, blocksize=8192, rest=None)
callback:For each block of the data received from the FTP server the callback function is called. This callback function can be used for processing the data received. For example, the callback can be used for writing the received blocks into a file
for example:
you can use this:
fhandle = open(filename, 'wb')
ftp.retrbinary('RETR ' + filename, fhandle.write)
or
ftp.retrbinary('RETR %s' % FILE, open(FILE, 'wb').write)