input: from typing import List
  
  
  def uses_list_comprehension(code: str) -> bool:
      """Check if the given code snippet uses list comprehension instead of a for loop and an append statement.
      >>> uses_list_comprehension("even_numbers = []\\nfor i in range(1,21):\\n    if i % 2 == 0:\\n        even_numbers.append(i)")
      False
      >>> uses_list_comprehension("even_numbers = [i for i in range(1, 21) if i % 2 == 0]")
      True
      """
output:     import ast
  
      class ListCompChecker(ast.NodeVisitor):
          def __init__(self):
              self.uses_list_comp = False
  
          def visit_ListComp(self, node):
              self.uses_list_comp = True
  
          def visit_For(self, node):
              if isinstance(node.body[0], ast.Expr) and isinstance(node.body[0].value, ast.Call) and isinstance(node.body[0].value.func, ast.Attribute) and node.body[0].value.func.attr == 'append':
                  self.uses_list_comp = False
  
      tree = ast.parse(code)
      checker = ListCompChecker()
      checker.visit(tree)
      return checker.uses_list_comp