39     def __init__(self, description: Optional[str] = None):  argument
40         self.comments = [] #type: List[str]
41         self.description = description #type: Optional[str]
42         self.dependencies = [] #type: List[str]
43         self.function = None #type: Optional[str]
44         self.arguments = [] #type: List[str]
46     def add_comment(self, *lines: str) -> None:  argument
47         self.comments += lines
49     def set_description(self, description: str) -> None:  argument
50         self.description = description
52     def set_dependencies(self, dependencies: List[str]) -> None:  argument
53         self.dependencies = dependencies
55     def set_function(self, function: str) -> None:  argument
56         self.function = function
58     def set_arguments(self, arguments: List[str]) -> None:  argument
59         self.arguments = arguments
61     def check_completeness(self) -> None:  argument
62         if self.description is None:
64         if self.function is None:
67     def write(self, out: typing_util.Writable) -> None:  argument
75         self.check_completeness()
76         assert self.description is not None # guide mypy
77         assert self.function is not None # guide mypy
79         for line in self.comments:
81         out.write(self.description + '\n')
82         if self.dependencies:
83             out.write('depends_on:' + ':'.join(self.dependencies) + '\n')
84         out.write(self.function + ':' + ':'.join(self.arguments) + '\n')