Geany supports Python by default. However, saving the code below to ~/.config/geany/filedefs/filetypes.python will provide additional “Build” tools and highlighting.
# For complete documentation of this file, please see Geany's main documentation [styling] default=default commentline=comment_line number=number_1 string=string_1 character=character word=keyword_1 triple=string_2 tripledouble=string_2 classname=type defname=function operator=operator identifier=identifier_1 commentblock=comment stringeol=string_eol word2=keyword_2 decorator=decorator [keywords] # all items must be in one line primary=and as assert break class continue def del elif else except exec finally for from global if import in is lambda not or pass print raise return try while with yield False None True identifiers=ArithmeticError AssertionError AttributeError BaseException BufferError BytesWarning DeprecationWarning EOFError Ellipsis EnvironmentError Exception FileNotFoundError FloatingPointError FutureWarning GeneratorExit IOError ImportError ImportWarning IndentationError IndexError KeyError KeyboardInterrupt LookupError MemoryError NameError NotImplemented NotImplementedError OSError OverflowError PendingDeprecationWarning ReferenceError RuntimeError RuntimeWarning StandardError StopIteration SyntaxError SyntaxWarning SystemError SystemExit TabError TypeError UnboundLocalError UnicodeDecodeError UnicodeEncodeError UnicodeError UnicodeTranslateError UnicodeWarning UserWarning ValueError Warning ZeroDivisionError __debug__ __doc__ __import__ __name__ __package__ abs all any apply basestring bin bool buffer bytearray bytes callable chr classmethod cmp coerce compile complex copyright credits delattr dict dir divmod enumerate eval execfile exit file filter float format frozenset getattr globals hasattr hash help hex id input int intern isinstance issubclass iter len license list locals long map max memoryview min next object oct open ord pow print property quit range raw_input reduce reload repr reversed round set setattr slice sorted staticmethod str sum super tuple type unichr unicode vars xrange zip [lexer_properties] fold.comment.python=1 fold.quotes.python=1 [settings] # default extension used when saving files extension=py # MIME type mime_type=text/x-python comment_single=# comment_open=""" comment_close=""" comment_use_indent=true # context action command (please see Geany's main documentation for details) context_action_cmd= [indentation] width=4 # 0 is spaces, 1 is tabs, 2 is tab & spaces type=0 [build_settings] # %f will be replaced by the complete filename # %e will be replaced by the filename without extension # (use only one of it at one time) compiler=python -m py_compile "%f" run_cmd=python "%f" [build-menu] FT_00_LB=_Flake8 FT_00_CM=flake8 --jobs=1 --ignore=E501 -v --max-complexity 10 --exclude=.svn,CVS,.bzr,.hg,.git,__pycache__,__init__.py,__init__ --show-pep8 --show-source "%d/%f" FT_00_WD= FT_01_LB= FT_01_CM= FT_01_WD= FT_02_LB=Build PyOpt FT_02_CM=python3 -Sq -OO -m py_compile "%d/%f" FT_02_WD= EX_00_LB=Terminal Exec EX_00_CM=gnome-terminal -t "Python Test" -e "bash -c \\"python3 -Sq %f; echo''; echo ''; echo 'Hit ENTER when done'; read\\"" EX_00_WD= error_regex=([^:]+):([0-9]+):([0-9:]+)? .* EX_01_LB=PyExecute EX_01_CM=python3 -Sq "%d/%f" EX_01_WD=