python - TypeError: input() 接受 2 个位置参数，但给出了 3 个

Question

我正在尝试学习python的基础知识，input()eric6中有这个命令，命令和错误是这样的：

size  = int(input('size: '))
Traceback (innermost last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\Asus\AppData\Local\Programs\Python\Python35\Lib\site-packages\eric6\DebugClients\Python\DebugClientBase.py", line 74, in DebugClientInput
    return DebugClientInstance.input(prompt, echo)
TypeError: input() takes 2 positional arguments but 3 were given