“str”对象不可调用，但我根本不使用“str”

Question

I'm using Google Colab for development. My script only has one line of code where I'm supposed to read input from the console:

question = input("Hello")

But it is throwing this error: 'str' object is not callable

I search for similar problems and all of them where related to code using "str" as a variable or function name so it needed to be renamed, but in my case it is literally one line of code and I'm not using "str" at all.

Here is a screenshot of Google Colab:

Answer 1

I tried this in a brand new notebook and it worked. In your notebook it appears that input is not the built-in function to read user input but is actually a string of some sort.

To debug this further, try changing the code to just say input . Then it will print what the input identifier is bound to. You ought to see something like <bound method Kernel.raw_input of <google.colab._kernel.Kernel object at 0x7f9fb5f40210>> ...

...but I suspect you'll see something else.

Answer 2

somewhere above you have

input = something_that_is_a_string

and that is shadowing the builtin input

dont name your variables input

Answer 3

You have a string variable named input previously in your code. Or perhaps you previously had such a variable and deleted the code, but the variable is still in the namespace. Just restart your Google Colab environment from the top menu: Runtime --> Restart Runtime . That will clear out all variables from memory and let you start over.