What is TypeError: slice indices must be integers or None or have an __index__ method?
If you have worked with lists/string in Python, you might have used the slicing technique for selecting specific elements. Using the : operator, you mention the starting index and ending index, between which are your required elements.
If the slicing is not done properly, you are bound to encounter the TypeError: slice indices must be integers or None or have an __index__ method error.
The solution to this problem is to use integers while mentioning slicing indices. Let us get into the details.
Example Using list
#Example of slicing indices type error MyList = [12,45,13,34,23] print(MyList) #This will print the whole list print(MyList[0:2] #This will print [12,45,13] print(MyList[0:'2']) #This will generate the TypeError
The above code will generate the following error.
TypeError: slice indices must be integers or None or have an __index__ method.
Here, line 4 of the code I.e print(MyList[0:’2’]) will throw an error because the ending index value is a string type and not integer.
Example Using string
str = "Hello my name is XYZ" print(str[0:5]) #This will print "Hello" print(str[0:'5']) #This will Generate an error
Line 3 of the i.e print(str[0:’5′]) above code will generate a TypeError :
slice indices must be integers or None or have an __index__ method error.
This is because the ending index value of the [ ] operator is a string and not integer. And we know, slice operator throws a TypeError when we provide value other than an integer to it.