fix: remove --require-hashes mode

Due to issues with pytype not pinning dependency versions, I'm removing
the explicit version checking semantics.

See also:
* google/pytype#731
* cjolowicz/hypermodern-python#174

README.md

@@ -1,12 +1,15 @@
 # hypermodern-python-seed
 
-Generate python seed apps based on [hypermodern-python][1].
+Generate python seed apps based on `cjolowicz's` [hypermodern-python][1]. Note
+that `cjolowicz` has also created a [seed][3] repo. I prefer this one b/c I only
+pulled in the ideas that are relevant to the projects I build, today.
 
 ## Dependencies
 
 * [cookiecutter](https://github.com/cookiecutter/cookiecutter)
 
-See [hypermodern-python][1] for installation instructions for these:
+See [hypermodern-python][1] for further installation instructions. You'll need
+these:
 
 * poetry
 * pyenv
@@ -20,6 +23,11 @@ See [hypermodern-python][1] for installation instructions for these:
 
     nox
 
+## Notes
+
+* Not using --require-hashes mode due to [pytype issue 731][2]
 
 # Links
 [1]: https://cjolowicz.github.io/posts/hypermodern-python-01-setup/
+[2]: https://github.com/google/pytype/issues/731
+[3]: https://github.com/cjolowicz/cookiecutter-hypermodern-python

{{cookiecutter.directory_name}}/noxfile.py

@@ -1,42 +1,26 @@
-"""project_name Nox sessions."""
-
-import tempfile
-from typing import Any
+"""{{cookiecutter.project_name}} Nox sessions."""
 
 import nox
 from nox.sessions import Session
 
 locations = "src", "tests", "noxfile.py", "docs/conf.py"
 nox.options.sessions = "lint", "mypy", "pytype", "tests"
-_versions = ["3.7"]
-
-
-def install_with_constraints(session: Session, *args: str, **kwargs: Any) -> None:
-    """Install application dependencies using constraints."""
-    with tempfile.NamedTemporaryFile() as requirements:
-        session.run(
-            "poetry",
-            "export",
-            "--dev",
-            "--format=requirements.txt",
-            f"--output={requirements.name}",
-            external=True,
-        )
-        session.install(f"--constraint={requirements.name}", *args, **kwargs)
+_versions = ["3.7", "3.8"]
 
 
 @nox.session(python=_versions)
 def lint(session: Session) -> None:
     """Run the code linters."""
     args = session.posargs or locations
-    install_with_constraints(
-        session,
+    session.install(
+        "darglint",
         "flake8",
         "flake8-annotations",
         "flake8-black",
-        "flake8-isort",
         "flake8-docstrings",
-        "darglint",
+        "flake8-isort",
+        "flake8-rst-docstrings",
+        "flake8_sphinx_links",
     )
     session.run("flake8", *args)
 
@@ -46,9 +30,7 @@ def tests(session: Session) -> None:
     """Run tests."""
     args = session.posargs or ["--cov", "--xdoctest"]
     session.run("poetry", "install", "--no-dev", external=True)
-    install_with_constraints(
-        session, "coverage[toml]", "pytest", "pytest-cov", "xdoctest"
-    )
+    session.install("coverage[toml]", "pytest", "pytest-cov", "xdoctest")
     session.run("pytest", *args)
 
 
@@ -63,37 +45,37 @@ def format(session: Session) -> None:
 def isort(session: Session) -> None:
     """Run the import re-orderer (isort)."""
     args = session.posargs or locations
-    install_with_constraints(session, "flake8-isort")
+    session.install("flake8-isort")
     session.run("isort", *args)
 
 
 @nox.session(python=_versions)
 def black(session: Session) -> None:
     """Run the code reformatter (black)."""
     args = session.posargs or locations
-    install_with_constraints(session, "black")
+    session.install("black")
     session.run("black", *args)
 
 
 @nox.session(python=_versions)
 def mypy(session: Session) -> None:
     """Run the static type checker (mypy))."""
     args = session.posargs or locations
-    install_with_constraints(session, "mypy")
+    session.install("mypy")
     session.run("mypy", *args)
 
 
 @nox.session(python=_versions)
 def pytype(session: Session) -> None:
     """Run the static type checker (pytype)."""
     args = session.posargs or ["--disable=import-error", *locations]
-    install_with_constraints(session, "pytype")
+    session.install("pytype")
     session.run("pytype", *args)
 
 
 @nox.session(python=_versions)
 def docs(session: Session) -> None:
     """Build the documentation."""
     session.run("poetry", "install", "--no-dev", external=True)
-    install_with_constraints(session, "sphinx", "sphinx-autodoc-typehints")
+    session.install("sphinx", "sphinx-autodoc-typehints")
     session.run("sphinx-build", "docs", "docs/_build")