在heroku上进行Python部署不能做math.cos（）

Question

我在Heroku上部署我的python程序，用于我的api.ai机器人的余弦计算。但是，在我得到cos的值并将值放在math.cos(value)函数中之后，api.ai将给出 "errorDetails": "Webhook call failed. Error: Webhook response was empty."

但如果我不使用math.cos()，程序将返回webhook响应。

计算代码：

def trig():
req = request.get_json(silent=True, force=True)
result = req.get("result")
parameters = result.get("parameters")
number = parameters.get("number")
trig_sign = parameters.get("Trigonometry")
number = float(number)
if trig_sign == "Cos":
    out = "The answer is "+ str(math.cos(number)) +" !"
speechText = out
displayText = out
print("Response:")
print(out)
return {
    "speech": speechText,
        "displayText": displayText,
        "source": "pas-robot-math-calculator"
    }

如果我没有输入math.cos（）

，程序将会起作用

def trig():
req = request.get_json(silent=True, force=True)
result = req.get("result")
parameters = result.get("parameters")
number = parameters.get("number")
trig_sign = parameters.get("Trigonometry")
number = float(number)
    #I did not put math.cos() here
    out = "The answer is !"
speechText = out
displayText = out
print("Response:")
print(out)
return {
    "speech": speechText,
        "displayText": displayText,
        "source": "pas-robot-math-calculator"
    }