Bump pip minimum version to >= 20.3

README.rst

@@ -495,5 +495,5 @@ versions as the required ``pip`` versions.
 +---------------+----------------+----------------+
 | 5.5.0         | 20.1 - 20.3.*  | 2.7, 3.5 - 3.9 |
 +---------------+----------------+----------------+
-| 6.0.0         | 20.1 - 20.3.*  | 3.6 - 3.9      |
+| 6.0.0         | 20.3+          | 3.6 - 3.9      |
 +---------------+----------------+----------------+

piptools/repositories/pypi.py

@@ -23,7 +23,7 @@
 from pip._internal.utils.urls import path_to_url, url_to_path
 from pip._vendor.requests import RequestException
 
-from .._compat import PIP_VERSION, contextlib
+from .._compat import contextlib
 from ..exceptions import NoCandidateFound
 from ..logging import log
 from ..utils import (
@@ -55,11 +55,7 @@ def __init__(self, pip_args, cache_dir):
         # General options (find_links, index_url, extra_index_url, trusted_host,
         # and pre) are deferred to pip.
         self.command = create_command("install")
-        extra_pip_args = (
-            []
-            if PIP_VERSION[:2] <= (20, 2)
-            else ["--use-deprecated", "legacy-resolver"]
-        )
+        extra_pip_args = ["--use-deprecated", "legacy-resolver"]
         self.options, _ = self.command.parse_args(pip_args + extra_pip_args)
         if self.options.cache_dir:
             self.options.cache_dir = normalize_path(self.options.cache_dir)
@@ -88,8 +84,6 @@ def __init__(self, pip_args, cache_dir):
         self._source_dir = None
         self._cache_dir = normalize_path(str(cache_dir))
         self._download_dir = os.path.join(self._cache_dir, "pkgs")
-        if PIP_VERSION[:2] <= (20, 2):
-            self._wheel_download_dir = os.path.join(self._cache_dir, "wheels")
 
         self._setup_logging()
 
@@ -119,8 +113,6 @@ def source_dir(self):
 
     def clear_caches(self):
         rmtree(self._download_dir, ignore_errors=True)
-        if PIP_VERSION[:2] <= (20, 2):
-            rmtree(self._wheel_download_dir, ignore_errors=True)
 
     def find_all_candidates(self, req_name):
         if req_name not in self._available_candidates_cache:
@@ -174,15 +166,10 @@ def resolve_reqs(self, download_dir, ireq, wheel_cache):
                 use_user_site=False,
                 download_dir=download_dir,
             )
-            if PIP_VERSION[:2] <= (20, 2):
-                preparer_kwargs["wheel_download_dir"] = self._wheel_download_dir
             preparer = self.command.make_requirement_preparer(**preparer_kwargs)
 
             reqset = RequirementSet()
-            if PIP_VERSION[:2] <= (20, 1):
-                ireq.is_direct = True
-            else:
-                ireq.user_supplied = True
+            ireq.user_supplied = True
             reqset.add_requirement(ireq)
 
             resolver = self.command.make_resolver(
@@ -200,10 +187,7 @@ def resolve_reqs(self, download_dir, ireq, wheel_cache):
             if not ireq.prepared:
                 # If still not prepared, e.g. a constraint, do enough to assign
                 # the ireq a name:
-                if PIP_VERSION[:2] <= (20, 2):
-                    resolver._get_abstract_dist_for(ireq)
-                else:
-                    resolver._get_dist_for(ireq)
+                resolver._get_dist_for(ireq)
 
         return set(results)
 
@@ -233,8 +217,6 @@ def get_dependencies(self, ireq):
             else:
                 download_dir = self._get_download_path(ireq)
                 os.makedirs(download_dir, exist_ok=True)
-            if PIP_VERSION[:2] <= (20, 2):
-                os.makedirs(self._wheel_download_dir, exist_ok=True)
 
             with global_tempdir_manager():
                 wheel_cache = WheelCache(self._cache_dir, self.options.format_control)

setup.cfg

@@ -30,7 +30,7 @@ packages = find:
 zip_safe = false
 install_requires =
     click >= 7
-    pip >= 20.1
+    pip >= 20.3
 
 [options.packages.find]
 exclude = tests

tests/test_resolver.py

@@ -1,6 +1,5 @@
 import pytest
 
-from piptools._compat import PIP_VERSION
 from piptools.exceptions import NoCandidateFound
 from piptools.resolver import RequirementSummary, combine_install_requirements
 
@@ -329,35 +328,23 @@ def test_compile_failure_shows_provenance(resolver, from_line):
             "test_package==1.2",
             "test_package==1.2.0",
             True,
-            marks=pytest.mark.skipif(
-                PIP_VERSION[:2] < (20, 2), reason="Required only for pip>=20.2"
-            ),
         ),
         pytest.param(
             "test_package>=1.2",
             "test_package>=1.2.0",
             True,
-            marks=pytest.mark.skipif(
-                PIP_VERSION[:2] < (20, 2), reason="Required only for pip>=20.2"
-            ),
         ),
         ("test_package[foo,bar]==1.2", "test_package[bar,foo]==1.2", True),
         ("test_package[foo,bar]>=1.2", "test_package[bar,foo]>=1.2", True),
         pytest.param(
             "test_package[foo,bar]==1.2",
             "test_package[bar,foo]==1.2.0",
             True,
-            marks=pytest.mark.skipif(
-                PIP_VERSION[:2] < (20, 2), reason="Required only for pip>=20.2"
-            ),
         ),
         pytest.param(
             "test_package[foo,bar]>=1.2",
             "test_package[bar,foo]>=1.2.0",
             True,
-            marks=pytest.mark.skipif(
-                PIP_VERSION[:2] < (20, 2), reason="Required only for pip>=20.2"
-            ),
         ),
         ("test_package", "other_test_package", False),
         ("test_package==1.2.3", "other_test_package==1.2.3", False),
@@ -391,35 +378,23 @@ def test_RequirementSummary_equality(from_line, left_hand, right_hand, expected)
             "test_package==1.2",
             "test_package==1.2.0",
             True,
-            marks=pytest.mark.skipif(
-                PIP_VERSION[:2] < (20, 2), reason="Required only for pip>=20.2"
-            ),
         ),
         pytest.param(
             "test_package>=1.2",
             "test_package>=1.2.0",
             True,
-            marks=pytest.mark.skipif(
-                PIP_VERSION[:2] < (20, 2), reason="Required only for pip>=20.2"
-            ),
         ),
         ("test_package[foo,bar]==1.2", "test_package[bar,foo]==1.2", True),
         ("test_package[foo,bar]>=1.2", "test_package[bar,foo]>=1.2", True),
         pytest.param(
             "test_package[foo,bar]==1.2",
             "test_package[bar,foo]==1.2.0",
             True,
-            marks=pytest.mark.skipif(
-                PIP_VERSION[:2] < (20, 2), reason="Required only for pip>=20.2"
-            ),
         ),
         pytest.param(
             "test_package[foo,bar]>=1.2",
             "test_package[bar,foo]>=1.2.0",
             True,
-            marks=pytest.mark.skipif(
-                PIP_VERSION[:2] < (20, 2), reason="Required only for pip>=20.2"
-            ),
         ),
         ("test_package", "other_test_package", False),
         ("test_package==1.2.3", "other_test_package==1.2.3", False),

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 envlist =
     # NOTE: keep this in sync with the env list in .github/workflows/ci.yml.
-    py{36,37,38,39,py3}-pip{20.1,20.2,20.3,previous,latest,master}-coverage
+    py{36,37,38,39,py3}-pip{20.3,previous,latest,master}-coverage
     checkqa
     readme
 skip_missing_interpreters = True
@@ -11,11 +11,9 @@ extras =
     testing
     coverage: coverage
 deps =
-    pipprevious: pip==20.2.*
+    pipprevious: pip==20.3.*
     piplatest: pip
     pipmaster: -e git+https://github.com/pypa/pip.git@master#egg=pip
-    pip20.1: pip==20.1.*
-    pip20.2: pip==20.2.*
     pip20.3: pip==20.3.*
 setenv =
     coverage: PYTEST_ADDOPTS=--strict --doctest-modules --cov --cov-report=term-missing --cov-report=xml {env:PYTEST_ADDOPTS:}