Toggle touchpad on/off (python/linux)

toggle_touchpad.py

#!/usr/bin/python2.7
import subprocess

def touchpad_currently_off():
    all_states = subprocess.check_output(['synclient']).split('\n')
    off_state = next((s for s in all_states if 'touchpadoff' in s.lower()), None)
    return '1' in off_state

def main():
    if touchpad_currently_off():
        subprocess.check_call(['synclient', 'touchpadoff=0'])
    else:
        subprocess.check_call(['synclient', 'touchpadoff=1'])

if __name__ == '__main__':
    main()

File "./toggle_touchpad.py", line 5
all_states = subprocess.check_output(['synclient']).split('\n')
^
IndentationError: expected an indented block
$

why is this happening in my system/pc

but this is working without python simply bash

Get the id number of the touchpad.
tp_id=xinput list | grep -i touchpad | awk '{ print $6 }' | sed 's/id=//'

Find out whether the touchpad is enabled or not.
tp_enabled=xinput list-props $tp_id | grep Device\ Enabled | awk '{ print $4 }'

if [ $tp_enabled = 0 ]
then

The touchpad is currently disabled, so turn it on.

xinput set-prop $tp_id "Device Enabled" 1
echo "Touchpad now on."
elif [ $tp_enabled = 1 ]
then

The touchpad is currently enabled, so turn it off.

xinput set-prop $tp_id "Device Enabled" 0
echo "Touchpad now off."
else
echo "tp_toggle: Could not get touchpad status from xinput."
exit 1
fi