Nameerror name ‘x_train’ is not defined

Hey, are you still stuck with the Python nameerror name ‘x_train’ is not defined error message?

In this article, we’ll hand you the solution to this error because we understand the feeling of someone who needs help but no one does.

Therefore, this article got you back! You just have to continue reading until this error is finally resolved.

Let’s get started by understanding what this error means and why it occurs in your code.

What is “nameerror: name ‘x_train’ is not defined”?

The error message namerror name ‘x_train’ is not defined occurs when the Python interpreter cannot find a variable named x_train because it is not defined yet.

In simple words, this error triggers when the interpreter encounters a reference to a variable or identifier called ‘x_train.’ 

However, the Python interpreter cannot find the definition or assignment for this variable within the current scope.

Moreover, this error message is related to nameerror: name ‘train_test_split’ is not defined.

Why does this error occur?

This error message can be raised due to some reasons, such as:

👎 When you misspelled the variable name.

👎 When you’re trying to use a variable before it’s been assigned a value.

👎 When the variable is not in the current scope.

How to fix “nameerror name ‘x_train’ is not defined”?

To fix the nameerror name ‘x_train’ is not defined, ensure that the variable “x_train” is defined and assigned a value before going to use it in your code.

Check the spelling of the variable name and verify that it has been initialized in the correct scope.

Lastly, ensure that any required libraries or modules are imported.

Solution 1: Define x_train

When the variable x_train is not defined yet, you have to define it before you can use it. You can do this by assigning a value to it.

For example:

x_train = [10, 20, 30, 40, 50]


[10, 20, 30, 40, 50]

Solution 2: Check the scope

Ensure that the variable x_train is defined in the same scope where you’re trying to use it. In Python, variables have different scopes depending on where they are defined.

def my_function():
    x_train = [1, 2, 3, 4, 5]



Solution 3: Import required libraries

When “x_train” is intended to be a NumPy array certainly, you have to import the “numpy” library.

This solution ensures that the necessary library is imported, allowing you to define and use “x_train” as a NumPy array.

import numpy as np

x_train = np.array([10, 20, 30, 40, 50])


[10 20 30 40 50]

Solution 4: Check for typos

Ensure that you have spelled every variable name correctly in your code because typos are always the root cause of this error.


In conclusion, the error message namerror name ‘x_train’ is not defined occurs when the Python interpreter cannot find a variable named x_train because it is not defined yet.

This article discusses what this error is all about and already provides solutions to help you fix this error.

You could also check out other “nameerror” articles that may help you in the future if you encounter them.

We are hoping that this article helps you fix the error. Thank you for reading itsourcecoders 😊

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