Trac #29068: little cleanup of imports and tweak again .lgtm.yml

* removing unused imports as suggested by lgtm and pyflakes

* mark some specific files as catalog-like in lgtm.yml

URL: https://trac.sagemath.org/29068
Reported by: chapoton
Ticket author(s): Frédéric Chapoton
Reviewer(s): Travis Scrimshaw

.lgtm.yml

@@ -6,6 +6,11 @@ path_classifiers:
   imports_only:
     - "**/all.py"
     - "**/*catalog*.py"
+    - "**/species/library.py"
+    - "**/matroids/advanced.py"
+    - "**/categories/basic.py"
+    - "**/interacts/geometry.py"
+    - "**/combinat/ribbon.py"
 extraction:
   python:
     python_setup:

build/sage_bootstrap/download/app.py

@@ -4,18 +4,16 @@
 """
 
 
-#*****************************************************************************
+# ****************************************************************************
 #       Copyright (C) 2016 Volker Braun <vbraun.name@gmail.com>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation, either version 2 of the License, or
 # (at your option) any later version.
-#                  http://www.gnu.org/licenses/
-#*****************************************************************************
+#                  https://www.gnu.org/licenses/
+# ****************************************************************************
 
-import os
-import sys
 import logging
 log = logging.getLogger()
 

build/sage_bootstrap/download/cmdline.py

@@ -5,18 +5,16 @@
 This module handles the main "sage-download-file" commandline utility.
 """
 
-
-#*****************************************************************************
+# ****************************************************************************
 #       Copyright (C) 2016 Volker Braun <vbraun.name@gmail.com>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation, either version 2 of the License, or
 # (at your option) any later version.
-#                  http://www.gnu.org/licenses/
-#*****************************************************************************
+#                  https://www.gnu.org/licenses/
+# ****************************************************************************
 
-import os
 import sys
 import logging
 log = logging.getLogger()

src/fpickle_setup.py

@@ -4,7 +4,6 @@
 a library file. It solves the issue from :trac:`11874`.
 """
 import types
-import copy
 from six.moves import copyreg
 from six import get_method_function, get_method_self
 

src/sage_setup/docbuild/ext/inventory_builder.py

@@ -7,13 +7,10 @@
     inventory files and pickle files. The documentation files are not written.
 """
 from sphinx.builders.html import StandaloneHTMLBuilder
-from sphinx.util.console import bold
 from os import path
-
-from six import iteritems, text_type
-
 import shutil
 
+
 class InventoryBuilder(StandaloneHTMLBuilder):
     """
     A customized HTML builder which only generates intersphinx "object.inv"

src/sage_setup/docbuild/ext/multidocs.py

@@ -23,10 +23,7 @@
 from six import text_type
 
 import os
-import sys
 import shutil
-import re
-import tempfile
 import sphinx
 from sphinx.util.console import bold
 from sage.env import SAGE_DOC