用jupyter notebook写python，提示缩进问题，但怎么看都看不出是哪里的问题

我的代码：

def get_range(self): 
         """打印一条消息，指出电瓶的续航里程""" 
        if self.battery_size == 70: 
            range = 240 
        elif self.battery_size == 85: 
            range = 270 

         message = "This car can go approximately " + str(range) 
         message += " miles on a full charge." 
         print(message) 

运行后提示错误：

File "<tokenize>", line 38
    if self.battery_size == 70:
    ^
IndentationError: unindent does not match any outer indentation level