python 錯誤之TypeError: XXXXX() takes no keyword arguments

舉個例子：

str1 = 'sunlightn'
f = str1.rfind("n", __start=1, __end=2)
print(f)

以上代碼運行后出現：

"D:\Program Files\Python\Python37-32\python.exe" D:/demo/str_1.py
Traceback (most recent call last):
  File "D:/demo/str_1.py", line 147, in <module>
    f = str1.rfind("n", __start=1, __end=2)
TypeError: rfind() takes no keyword arguments

Process finished with exit code 1

意思是 rfind()方法不接受關鍵字參數，而代碼中又使用了關鍵字參數

修改為位置參數后正常運行

 

str1 = 'sunlightn'
f = str1.rfind("n", 1, 2)
print(f)

"D:\Program Files\Python\Python37-32\python.exe" D:/demo/str_1.py
-1

Process finished with exit code 0