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---
layout: documentation
title: Variable x is read only
---
# Error: Variable x is read only
A global variable cannot be reassigned. It will always point to the same object.
However, its content might change, if the value is mutable (for example, the
content of a list). Local variables don't have this restriction.
```python
a = [1, 2]
a[1] = 3
b = 3
b = 4 # forbidden
```
`ERROR: /path/ext.bzl:7:1: Variable b is read only`
You will get a similar error if you try to redefine a function (function
overloading is not supported), for example:
```python
def foo(x): return x + 1
def foo(x, y): return x + y # forbidden
```
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