in usort/util.py [0:0]
def parse_import(code: str) -> cst.SimpleStatementLine:
"""
Parse a single import statement. For testing and debugging purposes only.
"""
node = cst.parse_statement(code)
if not isinstance(node, cst.SimpleStatementLine):
raise ValueError("not a statement")
if not isinstance(node.body[0], (cst.Import, cst.ImportFrom)):
raise ValueError("not an import statement")
return node