这个python函数有什么问题

Question

我已经定义了一个函数，如果传递了字符串，则返回长度；如果传递了整数，则输出一些内容。但是，它也在计算整数的长度。

这是我的代码：

def string_length(mystring):
    if type(mystring) == int:
         return "Sorry, integers don't have length"
    else:
         return len(mystring)
str = input ( "enter a string" )
print ( string_length(str))

输出为

 "C:\Users\Naveen Reddy\PycharmProjects\Assignments\venv\Scripts\python.exe" "C:/Users/Naveen Reddy/PycharmProjects/Assignments/passing int as argument, which should have strings.py"
enter a string222
3

Process finished with exit code 0

，字符串的输出为：

    "C:\Users\Naveen Reddy\PycharmProjects\Assignments\venv\Scripts\python.exe" "C:/Users/Naveen Reddy/PycharmProjects/Assignments/passing int as argument, which should have strings.py"
enter a stringabcd
4

Process finished with exit code 0