如何正确使用python访问系统命令并使我的脚本工作？

Question

So the script I have is to have a larger dzen2 outputting conky on the screen when I have less than 3 workspaces open on i3 and shrink it back down when I have more than 3 workspaces open. Here's the script dzresize.py:

import subprocess
def main():
    #gets the number of workspaces from i3
    status = subprocess.check_output(["i3-msg", "-t", "get_workspaces"])
    #puts status in a list
    status_list = list(status)
    #sets name to 0
    name = 0
    for i in status_list:
        if i == "name":
            name +=1
    #counts the amount of name in status_list
    if len(status_list) <=3:
    #if the workspaces are less than or equal to 3, expands dzen2 with conky output
            subprocess.check_output(["conky", "-d", "-c", "~/bin/conkyrc_cli|dzen2", "-fg", "#666666", "-bg", "#333333", "-ta", "left", "-w", "725", "-x", "54", "-y", "750"])
    else:
    #if the workspaces are greater than or equal to 3 run the minimal smaller size dzen2 with conky
            subprocess.check_output(["dzconky.sh"])
main()

Here's the output of the scrip:

Conky: forked to background, pid is 18519

sample output (if I have 2 workspaces open) for i3-msg -t get_workspaces:

i3-msg -t get_workspaces
[{"num":1,"name":"1","visible":false,"focused":false,"rect":{"x":0,"y":0,"width":1366,"height":749},"#output":"LVDS1","urgent":false},{"num":2,"name":"2","visible":true,"focused":true,"rect":{"x":0,"y":#0,"width":1366,"height":749},"output":"LVDS1","urgent":false}]

Relies on i3, dzen2 and the files ~/bin/conkyrc_cli and ~/bin/dzconky.sh. ~/bin/conkyrc_cli:

# Conky configuration for Dzen2, to be piped into i3bar
##############################################
#  Settings
##############################################
background no
out_to_console yes
update_interval 1.0
total_run_times 0
use_spacer none
TEXT
^fg(\#6699cc)Processor^fg()^fg(green)${cpu cpu0}.00%^fg()^fg(white)|^fg(\#6699cc)Memory^fg()^fg(green)${memperc}.00%^fg()^fg(white)|^fg(\#6699cc)Root^fg()^fg(green)${fs_used_perc /}.00%^fg()^fg(white)|^fg(\#6699cc)Home^fg()^fg(green)${fs_used_perc /home}.00%^fg()^fg(white)|^fg(\#6699cc)Temperature^fg()^fg(green)${hwmon temp 1}'C^fg()^fg(white)|^fg(\#6699cc)Dn^fg()^fg(green)${downspeedf wlan0}KiB^fg()^fg(white)|^fg(\#6699cc)U^fg()^fg(green)${upspeedf wlan0}KiB^fg()

~/bin/dzconky.sh:

#!/bin/sh
exec conky -d -c "$HOME/bin/conkyrc_cli" | dzen2 -fg "#666666" -bg "#333333" -ta left -w 607 -x 188 -y 750 &
exit 0

Edit: updated to code to reflect new changes and new output

Answer 1

You forgot , in all subprocess.call([...])

["i3-msg", "-t", "get_workspaces"]

edit:

if len(status_list) <=3:
    subprocess.check_output(["dzconky_for_3_workspaces.sh"])
else:
    subprocess.check_output(["dzconky.sh"])

dzconky_for_3_workspaces.sh

#!/bin/sh
exec conky -d -c "$HOME/bin/conkyrc_cli" | dzen2 -fg "#666666" -bg "#333333" -ta left -w 725 -x 54 -y 750 &
exit 0

Answer 2

You can use python's sh package. It is very nice pythonic wrapper for shell execution. If you take a look at the documentation you will find that sh do probably most cases you need in a few lines.

Installation

pip install sh

From docs:

easy as:

from sh import curl, git, ifconfig, ls
ls()
git('fetch')
ifconfig(a=True)

redirections:

ls(_out="files.list")
ls("nonexistent", _err="error.txt")
# there is also _in for stdin

piping:

# sort this directory by biggest file
print(sort(du(glob("*"), "-sb"), "-rn"))