# Source: https://docs.datadoghq.com/security/code_security/static_analysis/static_analysis_rules/python-best-practices/ambiguous-variable-name.md

---
title: make sure variable names are readable
description: Datadog, the leading service for cloud-scale monitoring.
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  Docs > Datadog Security > Code Security > Static Code Analysis (SAST) > SAST
  Rules > make sure variable names are readable
---

# make sure variable names are readable

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## Metadata{% #metadata %}

**ID:** `python-best-practices/ambiguous-variable-name`

**Language:** Python

**Severity:** Notice

**Category:** Best Practices

## Description{% #description %}

In some fonts, some characters are indistinguishable from the numerals one and zero, such as, O looks like a zero. Use characters that are not ambiguous.

## Non-Compliant Code Examples{% #non-compliant-code-examples %}

```python
I = 1  # use i instead
```

## Compliant Code Examples{% #compliant-code-examples %}

```python
def i():
    pass
```
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