我们从Python开源项目中，提取了以下50个代码示例，用于说明如何使用symbol.expr()。
def decorator(self, nodelist): # '@' dotted_name [ '(' [arglist] ')' ] assert len(nodelist) in (3, 5, 6) assert nodelist[0][0] == token.AT assert nodelist[-1][0] == token.NEWLINE assert nodelist[1][0] == symbol.dotted_name funcname = self.decorator_name(nodelist[1][1:]) if len(nodelist) > 3: assert nodelist[2][0] == token.LPAR expr = self.com_call_function(funcname, nodelist[3]) else: expr = funcname return expr
def parseexpr(self, text): """Return a modified parse tree for the given expression text.""" return self.transform(parser.expr(text))
def yield_stmt(self, nodelist): expr = self.com_node(nodelist[0]) return Discard(expr, lineno=expr.lineno)
def exec_stmt(self, nodelist): # exec_stmt: 'exec' expr ['in' expr [',' expr]] expr1 = self.com_node(nodelist[1]) if len(nodelist) >= 4: expr2 = self.com_node(nodelist[3]) if len(nodelist) >= 6: expr3 = self.com_node(nodelist[5]) else: expr3 = None else: expr2 = expr3 = None return Exec(expr1, expr2, expr3, 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 expr(self, nodelist): # xor_expr ('|' xor_expr)* return self.com_binary(Bitor, nodelist)
def com_try_except_finally(self, nodelist): # ('try' ':' suite # ((except_clause ':' suite)+ ['else' ':' suite] ['finally' ':' suite] # | 'finally' ':' suite)) if nodelist[3][0] == token.NAME: # first clause is a finally clause: only try-finally return TryFinally(self.com_node(nodelist[2]), self.com_node(nodelist[5]), lineno=nodelist[0][2]) #tryexcept: [TryNode, [except_clauses], elseNode)] clauses = [] elseNode = None finallyNode = None for i in range(3, len(nodelist), 3): node = nodelist[i] if node[0] == symbol.except_clause: # except_clause: 'except' [expr [(',' | 'as') expr]] */ if len(node) > 2: expr1 = self.com_node(node[2]) if len(node) > 4: expr2 = self.com_assign(node[4], OP_ASSIGN) else: expr2 = None else: expr1 = expr2 = None clauses.append((expr1, expr2, self.com_node(nodelist[i+2]))) if node[0] == token.NAME: if node[1] == 'else': elseNode = self.com_node(nodelist[i+2]) elif node[1] == 'finally': finallyNode = self.com_node(nodelist[i+2]) try_except = TryExcept(self.com_node(nodelist[2]), clauses, elseNode, lineno=nodelist[0][2]) if finallyNode: return TryFinally(try_except, finallyNode, lineno=nodelist[0][2]) else: return try_except
def com_with_item(self, nodelist, body, lineno): # with_item: test ['as' expr] if len(nodelist) == 4: var = self.com_assign(nodelist[3], OP_ASSIGN) else: var = None expr = self.com_node(nodelist[1]) return With(expr, var, body, lineno=lineno)
def com_list_comprehension(self, expr, node): return self.com_comprehension(expr, None, node, 'list')
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)
