def _convert(node):
if isinstance(node, ast.Str):
return node.s
elif isinstance(node, ast.Num):
return node.n
elif isinstance(node, ast.Tuple):
return tuple(map(_convert, node.elts))
elif isinstance(node, ast.List):
return list(map(_convert, node.elts))
elif isinstance(node, ast.Dict):
return dict((_convert(k), _convert(v)) for k, v
in zip(node.keys, node.values))
elif isinstance(node, ast.Name):
if node.id in SAFE_CONSTANTS:
return SAFE_CONSTANTS[node.id]
raise ValueError('malformed or disallowed expression')
python类List()的实例源码
def TRY(self, node):
handler_names = []
# List the exception handlers
for i, handler in enumerate(node.handlers):
if isinstance(handler.type, ast.Tuple):
for exc_type in handler.type.elts:
handler_names.append(getNodeName(exc_type))
elif handler.type:
handler_names.append(getNodeName(handler.type))
if handler.type is None and i < len(node.handlers) - 1:
self.report(messages.DefaultExceptNotLast, handler)
# Memorize the except handlers and process the body
self.exceptHandlers.append(handler_names)
for child in node.body:
self.handleNode(child, node)
self.exceptHandlers.pop()
# Process the other nodes: "except:", "else:", "finally:"
self.handleChildren(node, omit='body')
def TRY(self, node):
handler_names = []
# List the exception handlers
for i, handler in enumerate(node.handlers):
if isinstance(handler.type, ast.Tuple):
for exc_type in handler.type.elts:
handler_names.append(getNodeName(exc_type))
elif handler.type:
handler_names.append(getNodeName(handler.type))
if handler.type is None and i < len(node.handlers) - 1:
self.report(messages.DefaultExceptNotLast, handler)
# Memorize the except handlers and process the body
self.exceptHandlers.append(handler_names)
for child in node.body:
self.handleNode(child, node)
self.exceptHandlers.pop()
# Process the other nodes: "except:", "else:", "finally:"
self.handleChildren(node, omit='body')
def TRY(self, node):
handler_names = []
# List the exception handlers
for handler in node.handlers:
if isinstance(handler.type, ast.Tuple):
for exc_type in handler.type.elts:
handler_names.append(getNodeName(exc_type))
elif handler.type:
handler_names.append(getNodeName(handler.type))
# Memorize the except handlers and process the body
self.exceptHandlers.append(handler_names)
for child in node.body:
self.handleNode(child, node)
self.exceptHandlers.pop()
# Process the other nodes: "except:", "else:", "finally:"
self.handleChildren(node, omit='body')
def function_def_defaults_qual(self):
'''Get a list of fully qualified default values in a function def
:return: List of defaults
'''
defaults = []
if 'node' in self._context:
for default in self._context['node'].args.defaults:
defaults.append(utils.get_qual_attr(
default,
self._context['import_aliases']))
return defaults
def __init__(self, name, source, scope):
if '__all__' in scope and isinstance(source, ast.AugAssign):
self.names = list(scope['__all__'].names)
else:
self.names = []
if isinstance(source.value, (ast.List, ast.Tuple)):
for node in source.value.elts:
if isinstance(node, ast.Str):
self.names.append(node.s)
super(ExportBinding, self).__init__(name, source)
def getParent(self, node):
# Lookup the first parent which is not Tuple, List or Starred
while True:
node = node.parent
if not hasattr(node, 'elts') and not hasattr(node, 'ctx'):
return node
def __init__(self, name, source, scope):
if '__all__' in scope and isinstance(source, ast.AugAssign):
self.names = list(scope['__all__'].names)
else:
self.names = []
if isinstance(source.value, (ast.List, ast.Tuple)):
for node in source.value.elts:
if isinstance(node, ast.Str):
self.names.append(node.s)
super(ExportBinding, self).__init__(name, source)
def getParent(self, node):
# Lookup the first parent which is not Tuple, List or Starred
while True:
node = node.parent
if not hasattr(node, 'elts') and not hasattr(node, 'ctx'):
return node
def BUILD_LIST(self, instr):
nitems = instr.oparg
nodes = []
list_ = _ast.List(elts=nodes, ctx=_ast.Load(), lineno=instr.lineno, col_offset=0)
for i in range(nitems):
nodes.insert(0, self.ast_stack.pop())
self.ast_stack.append(list_)
def __init__(self, name, source, scope):
if '__all__' in scope and isinstance(source, ast.AugAssign):
self.names = list(scope['__all__'].names)
else:
self.names = []
if isinstance(source.value, (ast.List, ast.Tuple)):
for node in source.value.elts:
if isinstance(node, ast.Str):
self.names.append(node.s)
super(ExportBinding, self).__init__(name, source)
def getParent(self, node):
# Lookup the first parent which is not Tuple, List or Starred
while True:
node = node.parent
if not hasattr(node, 'elts') and not hasattr(node, 'ctx'):
return node
def _get_literal_value(self, literal):
'''Utility function to turn AST literals into native Python types
:param literal: The AST literal to convert
:return: The value of the AST literal
'''
if isinstance(literal, _ast.Num):
literal_value = literal.n
elif isinstance(literal, _ast.Str):
literal_value = literal.s
elif isinstance(literal, _ast.List):
return_list = list()
for li in literal.elts:
return_list.append(self._get_literal_value(li))
literal_value = return_list
elif isinstance(literal, _ast.Tuple):
return_tuple = tuple()
for ti in literal.elts:
return_tuple = return_tuple + (self._get_literal_value(ti),)
literal_value = return_tuple
elif isinstance(literal, _ast.Set):
return_set = set()
for si in literal.elts:
return_set.add(self._get_literal_value(si))
literal_value = return_set
elif isinstance(literal, _ast.Dict):
literal_value = dict(zip(literal.keys, literal.values))
elif isinstance(literal, _ast.Ellipsis):
# what do we want to do with this?
literal_value = None
elif isinstance(literal, _ast.Name):
literal_value = literal.id
# NOTE(sigmavirus24): NameConstants are only part of the AST in Python
# 3. NameConstants tend to refer to things like True and False. This
# prevents them from being re-assigned in Python 3.
elif six.PY3 and isinstance(literal, _ast.NameConstant):
literal_value = str(literal.value)
# NOTE(sigmavirus24): Bytes are only part of the AST in Python 3
elif six.PY3 and isinstance(literal, _ast.Bytes):
literal_value = literal.s
else:
literal_value = None
return literal_value
