main: initial library code

.style.yapf

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+[style]
+based_on_style = pep8
+column_limit = 240
+blank_line_before_class_docstring = False
+blank_lines_around_top_level_definition = 2
+blank_line_before_nested_class_or_def = False
+continuation_align_style = Fixed
+continuation_indent_width = 4
+dedent_closing_brackets = True
+align_closing_bracket_with_visual_indent = False
+split_before_closing_bracket = True
+split_before_first_argument = False
+coalesce_brackets = True
+each_dict_entry_on_separate_line = True
+spaces_around_dict_delimiters = True
+spaces_before_comment = 1
+split_all_comma_separated_values = True
+split_before_dict_set_generator = True
+allow_split_before_dict_value = False