Implement suggestions from code-review.

Author: wchresta

pyt/cfg/alias_helper.py

@@ -89,6 +89,6 @@ def fully_qualify_alias_labels(label, aliases):
     for alias, full_name in aliases.items():
         if label == alias:
             return full_name
-        if label.startswith(alias+'.'):
+        elif label.startswith(alias+'.'):
             return full_name + label[len(alias):]
     return label

pyt/cfg/stmt_visitor.py

@@ -6,11 +6,11 @@
 
 from .alias_helper import (
     as_alias_handler,
+    fully_qualify_alias_labels,
     handle_aliases_in_init_files,
     handle_fdid_aliases,
     not_as_alias_handler,
-    retrieve_import_alias_mapping,
-    fully_qualify_alias_labels
+    retrieve_import_alias_mapping
 )
 from ..core.ast_helper import (
     generate_ast,
@@ -816,6 +816,7 @@ def add_module(  # noqa: C901
         module_path = module[1]
 
         parent_definitions = self.module_definitions_stack[-1]
+        # Here, in `visit_Import` and in `visit_ImportFrom` are the only places the `import_alias_mapping` is updated
         parent_definitions.import_alias_mapping.update(import_alias_mapping)
         parent_definitions.import_names = local_names
 
@@ -1106,7 +1107,7 @@ def visit_ImportFrom(self, node):
                     from_from=True
                 )
 
-        # Remember aliases for uninspecatble modules such that we can label them fully qualified
+        # Remember aliases for uninspectable modules such that we can label them fully qualified
         # e.g. we want a call to "os.system" be recognised, even if we do "from os import system"
         # from os import system as mysystem -> module=os, name=system, asname=mysystem
         for name in node.names: