Fix: typing. Iterable doesn't have __getitem__ (#393)

Signed-off-by: Matthijs van der Burgh <[email protected]>

launch_ros/launch_ros/substitutions/executable_in_package.py

@@ -15,8 +15,8 @@
 """Module for the ExecutableInPackage substitution."""
 
 import os
-from typing import Iterable
 from typing import List
+from typing import Sequence
 from typing import Text
 
 from launch.frontend import expose_substitution
@@ -51,7 +51,7 @@ def __init__(self, executable: SomeSubstitutionsType, package: SomeSubstitutions
         self.__executable = normalize_to_list_of_substitutions(executable)
 
     @classmethod
-    def parse(cls, data: Iterable[SomeSubstitutionsType]):
+    def parse(cls, data: Sequence[SomeSubstitutionsType]):
         """Parse a ExecutableInPackage substitution."""
         if not data or len(data) != 2:
             raise AttributeError('exec-in-package substitution expects 2 arguments')

launch_ros/launch_ros/substitutions/find_package.py

@@ -14,8 +14,8 @@
 
 """Module for the FindPackage substitution."""
 
-from typing import Iterable
 from typing import List
+from typing import Sequence
 from typing import Text
 
 from ament_index_python.packages import get_package_prefix
@@ -45,7 +45,7 @@ def __init__(
         self.__package = normalize_to_list_of_substitutions(package)
 
     @classmethod
-    def parse(cls, data: Iterable[SomeSubstitutionsType]):
+    def parse(cls, data: Sequence[SomeSubstitutionsType]):
         """Parse a FindPackage substitution."""
         if not data or len(data) != 1:
             raise AttributeError('find package substitutions expect 1 argument')

launch_ros/launch_ros/substitutions/parameter.py

@@ -19,6 +19,7 @@
 from typing import Iterable
 from typing import List
 from typing import Optional
+from typing import Sequence
 from typing import Text
 from typing import Union
 
@@ -68,7 +69,7 @@ def __init__(
                 normalize_to_list_of_substitutions(str_normalized_default)
 
     @classmethod
-    def parse(cls, data: Iterable[SomeSubstitutionsType]):
+    def parse(cls, data: Sequence[SomeSubstitutionsType]):
         """Parse a Parameter substitution."""
         if len(data) < 1 or len(data) > 2:
             raise TypeError('param substitution expects 1 or 2 arguments')