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Is the “Typeerror: slice indices must be integers or none or have an __index__ method” annoying you to no end? Let’s put a stop to it by reading this tutorial. We provide clear examples to help you tackle the problems!
What Is Python Slicing?
Python slicing is an operation that lets you access portions of a sequence like lists, tuples, and strings. It is also possible to employ them for item deletion or modifications of mutable sequences (such as lists).
We can even apply slices on some third-party objects (NumPy arrays), or data frames and Panda series. With slicing, you can write readable, concise, and clean codes.
Why Does The Error Occur?
First, let’s investigate why the “TypeError: slice indices must be integers or None or have an __index__ method” happens in the first place.
This error will occur if programmers turn to non-integer values for slicing (for example, a float). Hence, the only way we can tackle this problem is to use integers during our slicing of strings, lists, or other sequences.
Let’s investigate a particular example.
Example (Error):
my_list = ['a', 'b', 'c', 'd']
start = 0.5
stop = 2.5
# ⛔️ TypeError: slice indices must be integers or None or have an __index__ method
result = my_list[start:stop]
In the example above, we have adopted floats for stop and start values during our list slicing.
How to Fix The Error “Typeerror: Slice Indices Must Be Integers or None or Have An __Index__ Method”
The list slicing’s syntax is my_list[start:stop:step].
So how can we solve this error? We suggest converting your floating-point values into integers.
Example (Solution):
my_list = ['a', 'b', 'c', 'd']
start = 0.5
stop = 2.5
result = my_list[int(start):int(stop)]
print(result) # 👉️ ['a', 'b']
And how do we convert the floating numbers into integers? Simple: we passed them to Int () classes.
Nevertheless, the error will occur if we use “/” (division operator). Why? Because “/” (division operator) always yields float values.
Example (Error):
main.py
print(10/2) # 👉️ 5.0
The “/” of integers produces floats, while “//” (floor divisions) of integers leads to an integer.
Example (Solution) (cont):
print(10//2) # 👉️ 5
Once we turn to integers for sequence slicing, the error will disappear!
But what if you are not sure about the object type stored in a variable? Then adopt the Built-in-type () to ascertain:
Example (Solution) (cont):
my_int = 10
print(type(my_int))
print(isinstance(my_int, int))
my_float = 3.14
print(type(my_float))
print(isinstance(my_float, float))
The “Type” class will send back the object type. Meanwhile, the “Isinstance” operation will send back “True” if the object “passed” serves as a subclass or instance of the class “passed”.
Conclusion
This article has shown clear examples of solutions for the “Typeerror: Slice indices must be integers or none or have an __index__ method”. We hope that this tutorial will lend you some help! Of course, for other Python Typeerrors (like “Unsupported operand type(s) for +: ‘int’ and ‘str’), feel free to browse our website for more support.
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