diff --git a/src/tox/_quickstart.py b/src/tox/_quickstart.py
index a4d641b01..74f082c66 100644
--- a/src/tox/_quickstart.py
+++ b/src/tox/_quickstart.py
@@ -92,16 +92,6 @@ def boolean(x):
     return x.upper() in ("Y", "YES")
 
 
-def suffix(x):
-    if not (x[0:1] == "." and len(x) > 1):
-        raise ValidationError("Please enter a file suffix, e.g. '.rst' or '.txt'.")
-    return x
-
-
-def ok(x):
-    return x
-
-
 def list_modificator(answer, existing=None):
     if not existing:
         existing = []
diff --git a/src/tox/constants.py b/src/tox/constants.py
index bd215625f..ecf0c97d0 100644
--- a/src/tox/constants.py
+++ b/src/tox/constants.py
@@ -27,7 +27,6 @@ def _construct_default_factors(cpython_versions, pypy_versions, other_interprete
 
 class PYTHON:
     PY_FACTORS_RE = re.compile("^(?!py$)(py|pypy|jython)([2-9][0-9]?)?$")
-    PY_FACTORS_MAP = {"py": "python", "pypy": "pypy", "jython": "jython"}
     CPYTHON_VERSION_TUPLES = [(2, 7), (3, 4), (3, 5), (3, 6), (3, 7), (3, 8)]
     PYPY_VERSION_TUPLES = [(2, 7), (3, 5)]
     OTHER_PYTHON_INTERPRETERS = ["jython"]
diff --git a/src/tox/exception.py b/src/tox/exception.py
index 4ad07e460..ace6a31d2 100644
--- a/src/tox/exception.py
+++ b/src/tox/exception.py
@@ -68,10 +68,6 @@ def __str__(self):
         return exit_code_str(self.__class__.__name__, self.command, self.exit_code)
 
 
-class MissingFile(Error):
-    """An error while invoking a script."""
-
-
 class MissingDirectory(Error):
     """A directory did not exist."""
 
diff --git a/src/tox/interpreters.py b/src/tox/interpreters.py
index 006470894..503b5065c 100644
--- a/src/tox/interpreters.py
+++ b/src/tox/interpreters.py
@@ -101,8 +101,6 @@ def __init__(self, executable, source, out, err):
 
 
 class InterpreterInfo:
-    runnable = True
-
     def __init__(self, name, executable, version_info, sysplatform):
         assert executable and version_info
         self.name = name
@@ -115,8 +113,6 @@ def __str__(self):
 
 
 class NoInterpreterInfo:
-    runnable = False
-
     def __init__(self, name, executable=None, out=None, err="not found"):
         self.name = name
         self.executable = executable
diff --git a/src/tox/session.py b/src/tox/session.py
index 47a50a8fb..fe54ee433 100644
--- a/src/tox/session.py
+++ b/src/tox/session.py
@@ -288,8 +288,6 @@ class Verbosity(object):
 
 
 class Reporter(object):
-    actionchar = "-"
-
     def __init__(self, session):
         self.tw = py.io.TerminalWriter()
         self.session = session
@@ -472,16 +470,6 @@ def cleanup(self):
                     tox_env.package.remove()
                     py.path.local(tox_env.package.dirname).remove(ignore_errors=True)
 
-    def _copyfiles(self, srcdir, pathlist, destdir):
-        for relpath in pathlist:
-            src = srcdir.join(relpath)
-            if not src.check():
-                self.report.error("missing source file: {}".format(src))
-                raise SystemExit(1)
-            target = destdir.join(relpath)
-            target.dirpath().ensure(dir=1)
-            src.copy(target)
-
     def make_emptydir(self, path):
         if path.check():
             self.report.info("  removing {}".format(path))
diff --git a/src/tox/venv.py b/src/tox/venv.py
index f250bf6fe..d3e9954c7 100755
--- a/src/tox/venv.py
+++ b/src/tox/venv.py
@@ -4,7 +4,6 @@
 import pipes
 import re
 import sys
-import warnings
 from itertools import chain
 
 import py
@@ -244,14 +243,6 @@ def _getliveconfig(self):
             alwayscopy,
         )
 
-    def _getresolvedeps(self):
-        warnings.warn(
-            "that's a private function there, use get_resolved_dependencies,"
-            "this will be removed in 3.2",
-            category=DeprecationWarning,
-        )
-        return self.get_resolved_dependencies()
-
     def get_resolved_dependencies(self):
         dependencies = []
         for dependency in self.envconfig.deps:
diff --git a/tests/unit/test_interpreters.py b/tests/unit/test_interpreters.py
index 0787b959e..9320a1080 100644
--- a/tests/unit/test_interpreters.py
+++ b/tests/unit/test_interpreters.py
@@ -136,7 +136,7 @@ class envconfig:
         info = interpreters.get_info(envconfig)
         assert info.version_info == tuple(sys.version_info)
         assert info.executable == sys.executable
-        assert info.runnable
+        assert isinstance(info, InterpreterInfo)
 
     def test_get_executable_no_exist(self, interpreters):
         class envconfig:
@@ -148,7 +148,7 @@ class envconfig:
         assert not info.version_info
         assert info.name == "1lkj23"
         assert not info.executable
-        assert not info.runnable
+        assert isinstance(info, NoInterpreterInfo)
 
     def test_get_sitepackagesdir_error(self, interpreters):
         class envconfig:
@@ -179,9 +179,6 @@ def info(
     ):
         return InterpreterInfo(name, executable, version_info, sysplatform)
 
-    def test_runnable(self):
-        assert self.info().runnable
-
     @pytest.mark.parametrize("missing_arg", ("executable", "version_info"))
     def test_assert_on_missing_args(self, missing_arg):
         with pytest.raises(AssertionError):
@@ -200,10 +197,6 @@ def test_str(self):
 
 
 class TestNoInterpreterInfo:
-    def test_runnable(self):
-        assert not NoInterpreterInfo("foo").runnable
-        assert not NoInterpreterInfo("foo", executable=sys.executable).runnable
-
     def test_default_data(self):
         x = NoInterpreterInfo("foo")
         assert x.name == "foo"