wxGUI: Fix flake8 F403, F405, F821 and F841 errors in statistics.py (#…

…4934)

* update

* update

* sort

.flake8

@@ -29,7 +29,6 @@ per-file-ignores =
     gui/wxpython/animation/g.gui.animation.py: E501
     gui/wxpython/tplot/g.gui.tplot.py: E501
     gui/wxpython/iclass/g.gui.iclass.py: E501
-    gui/wxpython/iclass/statistics.py: F841, F405, F403
     gui/wxpython/location_wizard/wizard.py: E722
     gui/wxpython/mapdisp/main.py: E722
     gui/wxpython/mapdisp/test_mapdisp.py: E501

gui/wxpython/iclass/statistics.py

@@ -18,13 +18,28 @@
 """
 
 import os
-from ctypes import *
+import sys
+from ctypes import byref, c_char_p, c_float, c_int
 
 import grass.script as gs
 
 try:
-    from grass.lib.imagery import *
-except ImportError as e:
+    from grass.lib.imagery import (
+        I_iclass_statistics_get_cat,
+        I_iclass_statistics_get_color,
+        I_iclass_statistics_get_histo,
+        I_iclass_statistics_get_max,
+        I_iclass_statistics_get_mean,
+        I_iclass_statistics_get_min,
+        I_iclass_statistics_get_name,
+        I_iclass_statistics_get_nbands,
+        I_iclass_statistics_get_ncells,
+        I_iclass_statistics_get_nstd,
+        I_iclass_statistics_get_range_max,
+        I_iclass_statistics_get_range_min,
+        I_iclass_statistics_get_stddev,
+    )
+except ImportError:
     sys.stderr.write(_("Loading imagery lib failed"))
 
 from grass.pydispatch.signal import Signal