doc: Fix Flake8 issues in example files

.flake8

@@ -22,9 +22,6 @@ per-file-ignores =
     __init__.py: F401, F403
     man/build_html.py: E501
     imagery/i.atcorr/create_iwave.py: F632, F821, W293
-    doc/python/raster_example_ctypes.py: F403, F405
-    doc/python/vector_example_ctypes.py: F403, F405
-    doc/python/m.distance.py: F403, F405, E501
     doc/gui/wxpython/example/dialogs.py: F401
     locale/grass_po_stats.py: E122, E128, E231, E401, E722
     gui/scripts/d.wms.py: E501

doc/python/m.distance.py

@@ -25,7 +25,7 @@
 
 # %module
 # % label: Finds the distance between two or more points.
-# % description: If the projection is latitude-longitude, this distance is measured along the geodesic.
+# % description: If the projection is lat-long, distance measured along the geodesic.
 # % keyword: miscellaneous
 # % keyword: distance
 # % keyword: measure
@@ -45,10 +45,15 @@
 # %end
 
 import sys
+from ctypes import byref, c_double
 
 import grass.script as gs
-
-from grass.lib.gis import *
+from grass.lib.gis import (
+    G_gisinit, G_begin_distance_calculations, G_scan_easting, G_scan_northing,
+    G_distance, G_begin_polygon_area_calculations, G_area_of_polygon,
+    G_database_units_to_meters_factor, G_database_unit_name,
+    PROJECTION_LL
+)
 
 
 def main():

doc/python/raster_example_ctypes.py

@@ -17,9 +17,16 @@
 
 import os
 import sys
+import math
 
-from grass.lib.gis import *
-from grass.lib.raster import *
+from ctypes import POINTER, c_int, c_float, c_double, c_void_p, cast
+
+from grass.lib.gis import G_gisinit, G_find_raster2, G_free
+from grass.lib.raster import (
+    Rast_map_type, CELL_TYPE, FCELL_TYPE, DCELL_TYPE,
+    Rast_open_old, Rast_allocate_buf, Rast_window_rows,
+    Rast_window_cols, Rast_get_row, Rast_close
+)
 
 # check if GRASS is running or not
 if "GISBASE" not in os.environ:

doc/python/vector_example_ctypes.py

@@ -7,9 +7,16 @@
 
 import os
 import sys
+from ctypes import pointer, byref
 
-from grass.lib.gis import *
-from grass.lib.vector import *
+# Import specific functions and classes instead of using wildcard imports
+from grass.lib.gis import G_gisinit, G_find_vector2
+from grass.lib.vector import (
+    Map_info, Vect_set_open_level, Vect_open_old, Vect_get_full_name,
+    Vect_is_3d, Vect_get_num_dblinks, Vect_get_scale, Vect_get_map_box,
+    Vect_point_in_box, Vect_get_num_lines, Vect_get_num_primitives,
+    Vect_get_num_areas, Vect_close, bound_box, GV_POINT, GV_LINE
+)
 
 if "GISBASE" not in os.environ:
     sys.exit("You must be in GRASS GIS to run this program.")