I'm trying to call subprocess from a python script. Script would call 'lftp' on linux with specific parameters as shown below. The problem as that I can not pass filename (filename will be different every day).
I was trying almost every combination but without success (for example: ${fname}, $fname, {fname} and so on). I'm running out of ideas so I'm asking for a help.
Every time I get response from ftps server Access failed: 550 The system cannot find the file specified. I can properly log on and change folder.
import subprocess
import datetime
fname=different_every_day
proc=subprocess.call(
["lftp", "-u", "user:password", "ftps://servername:990", "-e",
"set ftp:ssl-protect-data true; set ftp:ssl-force true; "
"set ssl:verify-certificate no;get ${fname}"])
print(proc)
P.S. Close to proper answer was wagnifico, so i will accept his answer but for others who need solution it suppose to be as below:
proc=subprocess.call(["lftp","-u","user:pass","ftps://example.something","-e","set ftp:ssl-protect-data true; set ftp:ssl-force true; set ssl:verify-certificate no;cd Ewidencja;pget "+'"'+fname+'"'])
You are mixing python and environment variables.
When you use ${fname}, bash considers fname an environment variable, something known by your OS. Since it is not defined, it will use an empty value, thus, not finding the file.
You either need to define fname in your terminal and them call it in python, as in the question:
export fname='2020-10-29 - All computers.xls'
python your_code.py
Also, you need to add the flag shell=True when you call subprocess.call
Or define it entirely in python:
fname='2020-10-29 - All computers.xls'
proc=subprocess.call(
["lftp", "-u", "user:password", "ftps://servername:990", "-e",
"set ftp:ssl-protect-data true; set ftp:ssl-force true; "
"set ssl:verify-certificate no;get " + fname])