In MacVim, I save following code as test.py
print "Hello world! python2"
, which is apparently wrong with python3, but after I run :w to save the file, there is no error message for it, Following is a part of ~/.vimrc, which is all about Syntastic:
" Syntastic
"" Recommended settings
set statusline+=%#warningmsg#
set statusline+=%{SyntasticStatuslineFlag()}
set statusline+=%*
let g:syntastic_always_populate_loc_list = 1
let g:syntastic_auto_loc_list = 1
let g:syntastic_check_on_open = 1
"" Display checker-name for that error-message
let g:syntastic_aggregate_errors = 1
"" I use the brew to install flake8
let g:syntastic_python_checkers=['flake8', 'python3']
How to make Syntastic detect this type of error as I run test.py in Terminal:
NingGW:Desktop ninggw$ python3 test.py
File "test.py", line 1
print "Hello world! python2"
^
SyntaxError: Missing parentheses in call to 'print'
Following is what :SyntasticInfo said:
Syntastic version: 3.8.0-10 (Vim 800, Darwin, GUI)
Info for filetype: python
Global mode: active
Filetype python is active
The current file will be checked automatically
Available checkers: flake8 python
Currently enabled checker: flake8
Press ENTER or type command to continue
flake8 is a Python package. It uses Python's built-in facilities to parse code, so it accepts syntax for the Python version that it belongs to.
How to install it for your python3 installation depends on how that installation itself was installed - unless you're fine with using pip.