For better readability, do not put more than one statement on a single line.
The following code snippet illustrates this rule :
if foo == 'blah': do_blah_thing() # Non-Compliant
do_one(); do_two(); do_three() # Non-Compliant
if foo == 'blah':
do_blah_thing()
do_one()
do_two()
do_three()