ifeval

Evaluate all if-statement predicates in a Python file and simplify the code by removing unreachable branches.

This tool parses a Python source file, evaluates constant if conditions (if f(x), if x is None, etc.), and rewrites the file to include only the branches that would execute.

Installation

Clone the repository and install with pip:

git clone https://gitlab.com/knvvv/ifeval.git
cd ifeval
pip install .

Usage

Dry run (default)

To preview changes without modifying the file:

ifeval path/to/your_script.py

It will print the diff showing what would be changed.

Apply changes

To actually rewrite the file in-place, add the --no-dry flag:

ifeval path/to/your_script.py --no-dry

Example

Given the following code:

print("Hello")
if True:
    print("Keep this")
else:
    print("Remove this")

ifeval simplifies it to:

print("Hello")
print("Keep this")

⚠️ A word of caution ⚠️

This package executes all the code from files being analyzed. Do not run it on untrusted or potentially malicious code, as it may lead to arbitrary code execution.