Are you having trouble with the problem “TypeError: slice indices must be integers or None or have an __index__ method”? Don’t worry! Let’s follow this article, we will give you some solutions to fix it.
The causes of “TypeError: slice indices must be integers or None or have an __index__ method” error
If you are working with list or string in Python, you can use the slicing method to select particular elements using the operator. You pass the indexes from start to end, which are your required elements. Then you will get this error.
This example below is about what happens when I forgot check type and not pass in an integer type but a float type:
anArray = [1, 2, 3, 4, 5, 6, 7, 8, 9]
a = 6 / 3
print((f"a : {a}"))
print(type(a))
print(anArray[0:a])Output :
a : 2.0
<class 'float'>
line 5, in <module>
print(anArray[0:a])
TypeError: slice indices must be integers or None or have an __index__ methodLet’s find out the solutions to these problems.
Solutions to fix “TypeError: slice indices must be integers or None or have an __index__ method” error
Method 1: Make sure that you are using integers while referring to slicing indices
Example code: Pass in a wrong type
anArray = [1, 2, 3, 4, 5, 6, 7, 8, 9] print(anArray) # This will print all the array element print(anArray[0:5]) # This will print the element from index 0 to index 5 print(anArray[0:'5']) # This will generate the TypeError
Output:
[1, 2, 3, 4, 5, 6, 7, 8, 9]
[1, 2, 3, 4, 5]
line 4, in <module>
print(anArray[0:'5']) # This will generate the TypeError
TypeError: slice indices must be integers or None or have an __index__ methodLists are indexed using whole numbers, which are known as integers. If you attempt to slice a list using a value that is not an integer, you’ll encounter the error. The method is to make sure that you are using integers while referring to slicing indices.
Don’t know what integers type is? Read more in data type in Python.
Method 2: Transform variable type to int
You should transform variable type to int as the following:
anArray = [1, 2, 3, 4, 5, 6, 7, 8, 9] a = 6 / 3 print(anArray[0:int(a)])
Output :
[1, 2]Summary
In this tutorial I’ve explained and showed you how to solve the error “Slice indices must be integers or None or have an __index__ method” in JavaScript. You should check the code line where the terminal shows you the error. It must be helpful.
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