unparse.py 文件源码

def _UnaryOp(self, t):
        self.write("(")
        self.write(self.unop[t.op.__class__.__name__])
        self.write(" ")
        # If we're applying unary minus to a number, parenthesize the number.
        # This is necessary: -2147483648 is different from -(2147483648) on
        # a 32-bit machine (the first is an int, the second a long), and
        # -7j is different from -(7j).  (The first has real part 0.0, the second
        # has real part -0.0.)
        if isinstance(t.op, ast.USub) and isinstance(t.operand, ast.Num):
            self.write("(")
            self.dispatch(t.operand)
            self.write(")")
        else:
            self.dispatch(t.operand)
        self.write(")")