From e17747cfc7bb3acd4dee7b3ce7f3110e47e96470 Mon Sep 17 00:00:00 2001
From: Michael Hucka <mhucka@google.com>
Date: Mon, 14 Apr 2025 19:57:37 -0700
Subject: [PATCH] Constrain pip to install NumPy < 2.0

The latest Cirq work with NumPy 2.0 and no longer constrains the NumPy
version like it did before, but Unitary does not seem to work with NumPy
2, so we need to tell pip not to install it.
---
 .github/workflows/pythonpackage.yml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index e0a6c0c..ecf114a 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -42,6 +42,8 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
+          echo 'numpy<2.0.0' > constraint.txt
+          export PIP_CONSTRAINT=constraint.txt
           python dev_tools/write-ci-requirements.py --relative-cirq-version=${{ matrix.cirq-version }} --all-extras
           pip install -r ci-requirements.txt
           pip install --no-deps -e .