我们从Python开源项目中，提取了以下25个代码示例，用于说明如何使用symbol.exprlist()。
def for_stmt(self, nodelist): # 'for' exprlist 'in' exprlist ':' suite ['else' ':' suite] assignNode = self.com_assign(nodelist[1], OP_ASSIGN) listNode = self.com_node(nodelist[3]) bodyNode = self.com_node(nodelist[5]) if len(nodelist) > 8: elseNode = self.com_node(nodelist[8]) else: elseNode = None return For(assignNode, listNode, bodyNode, elseNode, lineno=nodelist[0][2])
def testlist(self, nodelist): # testlist: expr (',' expr)* [','] # testlist_safe: test [(',' test)+ [',']] # exprlist: expr (',' expr)* [','] return self.com_binary(Tuple, nodelist)
def com_generator_expression(self, expr, node): # comp_iter: comp_for | comp_if # comp_for: 'for' exprlist 'in' test [comp_iter] # comp_if: 'if' test [comp_iter] lineno = node[1][2] fors = [] while node: t = node[1][1] if t == 'for': assignNode = self.com_assign(node[2], OP_ASSIGN) genNode = self.com_node(node[4]) newfor = GenExprFor(assignNode, genNode, [], lineno=node[1][2]) fors.append(newfor) if (len(node)) == 5: node = None else: node = self.com_comp_iter(node[5]) elif t == 'if': test = self.com_node(node[2]) newif = GenExprIf(test, lineno=node[1][2]) newfor.ifs.append(newif) if len(node) == 3: node = None else: node = self.com_comp_iter(node[3]) else: raise SyntaxError, \ ("unexpected generator expression element: %s %d" % (node, lineno)) fors[0].is_outmost = True return GenExpr(GenExprInner(expr, fors), lineno=lineno)
def com_assign(self, node, assigning): # return a node suitable for use as an "lvalue" # loop to avoid trivial recursion while 1: t = node[0] if t in (symbol.exprlist, symbol.testlist, symbol.testlist_safe, symbol.testlist_comp): if len(node) > 2: return self.com_assign_tuple(node, assigning) node = node[1] elif t in _assign_types: if len(node) > 2: raise SyntaxError, "can't assign to operator" node = node[1] elif t == symbol.power: if node[1][0] != symbol.atom: raise SyntaxError, "can't assign to operator" if len(node) > 2: primary = self.com_node(node[1]) for i in range(2, len(node)-1): ch = node[i] if ch[0] == token.DOUBLESTAR: raise SyntaxError, "can't assign to operator" primary = self.com_apply_trailer(primary, ch) return self.com_assign_trailer(primary, node[-1], assigning) node = node[1] elif t == symbol.atom: t = node[1][0] if t == token.LPAR: node = node[2] if node[0] == token.RPAR: raise SyntaxError, "can't assign to ()" elif t == token.LSQB: node = node[2] if node[0] == token.RSQB: raise SyntaxError, "can't assign to []" return self.com_assign_list(node, assigning) elif t == token.NAME: return self.com_assign_name(node[1], assigning) else: raise SyntaxError, "can't assign to literal" else: raise SyntaxError, "bad assignment (%s)" % t
def com_comprehension(self, expr1, expr2, node, type): # list_iter: list_for | list_if # list_for: 'for' exprlist 'in' testlist [list_iter] # list_if: 'if' test [list_iter] # XXX should raise SyntaxError for assignment # XXX(avassalotti) Set and dict comprehensions should have generator # semantics. In other words, they shouldn't leak # variables outside of the comprehension's scope. lineno = node[1][2] fors = [] while node: t = node[1][1] if t == 'for': assignNode = self.com_assign(node[2], OP_ASSIGN) compNode = self.com_node(node[4]) newfor = ListCompFor(assignNode, compNode, []) newfor.lineno = node[1][2] fors.append(newfor) if len(node) == 5: node = None elif type == 'list': node = self.com_list_iter(node[5]) else: node = self.com_comp_iter(node[5]) elif t == 'if': test = self.com_node(node[2]) newif = ListCompIf(test, lineno=node[1][2]) newfor.ifs.append(newif) if len(node) == 3: node = None elif type == 'list': node = self.com_list_iter(node[3]) else: node = self.com_comp_iter(node[3]) else: raise SyntaxError, \ ("unexpected comprehension element: %s %d" % (node, lineno)) if type == 'list': return ListComp(expr1, fors, lineno=lineno) elif type == 'set': return SetComp(expr1, fors, lineno=lineno) elif type == 'dict': return DictComp(expr1, expr2, fors, lineno=lineno) else: raise ValueError("unexpected comprehension type: " + repr(type))
