reconfigure prerelease pip installs

Author: TrevorBergeron

noxfile.py

@@ -20,7 +20,6 @@
 import multiprocessing
 import os
 import pathlib
-import re
 import shutil
 import time
 from typing import Dict, List
@@ -583,11 +582,13 @@ def prerelease(session: nox.sessions.Session, tests_path, extra_pytest_options=(
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
-
-    # Ignore officially released versions of certain packages specified in
-    # testing/constraints-*.txt and install a more recent, pre-release versions
-    # directly
-    already_installed = set()
+    session.install(
+        *set(UNIT_TEST_STANDARD_DEPENDENCIES + SYSTEM_TEST_STANDARD_DEPENDENCIES),
+        "-c",
+        constraints_path,
+        "-e",
+        ".",
+    )
 
     # PyArrow prerelease packages are published to an alternative PyPI host.
     # https://arrow.apache.org/docs/python/install.html#installing-nightly-packages
@@ -598,10 +599,6 @@ def prerelease(session: nox.sessions.Session, tests_path, extra_pytest_options=(
         "--pre",
         "--upgrade",
         "pyarrow",
-    )
-    already_installed.add("pyarrow")
-
-    session.install(
         "--prefer-binary",
         "--pre",
         "--upgrade",
@@ -610,62 +607,19 @@ def prerelease(session: nox.sessions.Session, tests_path, extra_pytest_options=(
         # https://github.com/googleapis/python-bigquery-dataframes/pull/268#discussion_r1423205172
         # "pandas!=2.1.4, !=2.2.0rc0, !=2.2.0, !=2.2.1",
         "pandas",
-    )
-    already_installed.add("pandas")
-
-    # Workaround https://github.com/googleapis/python-db-dtypes-pandas/issues/178
-    session.install("--no-deps", "db-dtypes")
-    already_installed.add("db-dtypes")
-
-    # Ensure we catch breaking changes in the client libraries early.
-    session.install(
+        # Workaround https://github.com/googleapis/python-db-dtypes-pandas/issues/178
+        "--no-deps",
+        "db-dtypes",
+        # Ensure we catch breaking changes in the client libraries early.
         "--upgrade",
         "git+https://github.com/googleapis/python-bigquery.git#egg=google-cloud-bigquery",
-    )
-    already_installed.add("google-cloud-bigquery")
-    session.install(
         "--upgrade",
         "-e",
         "git+https://github.com/googleapis/google-cloud-python.git#egg=google-cloud-bigquery-storage&subdirectory=packages/google-cloud-bigquery-storage",
-    )
-    already_installed.add("google-cloud-bigquery-storage")
-    session.install(
         "--upgrade",
         "git+https://github.com/googleapis/python-bigquery-pandas.git#egg=pandas-gbq",
+        "--no-deps",
     )
-    already_installed.add("pandas-gbq")
-
-    session.install(
-        *set(UNIT_TEST_STANDARD_DEPENDENCIES + SYSTEM_TEST_STANDARD_DEPENDENCIES),
-        "-c",
-        constraints_path,
-    )
-
-    # Because we test minimum dependency versions on the minimum Python
-    # version, the first version we test with in the unit tests sessions has a
-    # constraints file containing all dependencies and extras.
-    with open(
-        CURRENT_DIRECTORY / "testing" / f"constraints-{DEFAULT_PYTHON_VERSION}.txt",
-        encoding="utf-8",
-    ) as constraints_file:
-        constraints_text = constraints_file.read()
-
-    # Ignore leading whitespace and comment lines.
-    deps = [
-        match.group(1)
-        for match in re.finditer(
-            r"^\s*(\S+)(?===\S+)", constraints_text, flags=re.MULTILINE
-        )
-        if match.group(1) not in already_installed
-    ]
-
-    print(already_installed)
-
-    # We use --no-deps to ensure that pre-release versions aren't overwritten
-    # by the version ranges in setup.py.
-    if deps:
-        session.install(*deps)
-    session.install("--no-deps", "-e", ".")
 
     # Print out prerelease package versions.
     session.run("python", "-m", "pip", "freeze")