diff --git a/setup.py b/setup.py
index e304e9f7..1664905b 100644
--- a/setup.py
+++ b/setup.py
@@ -58,6 +58,7 @@
     description='The SolveBio Python client',
     long_description=long_description,
     long_description_content_type='text/markdown',
+    python_requires='>=3.8',
     author='Solve, Inc.',
     author_email='contact@solvebio.com',
     url='https://github.com/solvebio/solvebio-python',
diff --git a/solvebio/__init__.py b/solvebio/__init__.py
index 8f5cd14b..460b3848 100644
--- a/solvebio/__init__.py
+++ b/solvebio/__init__.py
@@ -103,7 +103,6 @@ def _set_cached_api_host(host):
 from .global_search import GlobalSearch
 from .annotate import Annotator, Expression
 from .client import client, SolveClient
-from .auth import authenticate
 from .resource import (
     Application,
     Beacon,
diff --git a/solvebio/__main__.py b/solvebio/__main__.py
index 9070a092..4e063336 100644
--- a/solvebio/__main__.py
+++ b/solvebio/__main__.py
@@ -1,6 +1,3 @@
-
-import sys
-
 from .cli.main import main
 
 if __name__ == "__main__":
diff --git a/solvebio/auth.py b/solvebio/auth.py
index ac39e284..47e78e56 100644
--- a/solvebio/auth.py
+++ b/solvebio/auth.py
@@ -58,22 +58,22 @@ def authenticate(
     # Find credentials from environment variables
     if not host:
         host = (
-            os.environ.get("QUARTZBIO_API_HOST", None)
-            or os.environ.get("EDP_API_HOST", None)
-            or os.environ.get("SOLVEBIO_API_HOST", None)
+            os.environ.get("QUARTZBIO_API_HOST", None) or
+            os.environ.get("EDP_API_HOST", None) or
+            os.environ.get("SOLVEBIO_API_HOST", None)
         )
 
     if not token:
         api_key = (
-            os.environ.get("QUARTZBIO_API_KEY", None)
-            or os.environ.get("EDP_API_KEY", None)
-            or os.environ.get("SOLVEBIO_API_KEY", None)
+            os.environ.get("QUARTZBIO_API_KEY", None) or
+            os.environ.get("EDP_API_KEY", None) or
+            os.environ.get("SOLVEBIO_API_KEY", None)
         )
 
         access_token = (
-            os.environ.get("QUARTZ_ACCESS_TOKEN", None)
-            or os.environ.get("EDP_ACCESS_TOKEN", None)
-            or os.environ.get("SOLVEBIO_ACCESS_TOKEN", None)
+            os.environ.get("QUARTZ_ACCESS_TOKEN", None) or
+            os.environ.get("EDP_ACCESS_TOKEN", None) or
+            os.environ.get("SOLVEBIO_ACCESS_TOKEN", None)
         )
 
         if access_token:
@@ -184,4 +184,4 @@ def validate_api_host_url(url):
     elif not parsed.netloc:
         raise SolveError("Invalid API host: %s." % url)
 
-    return parsed.geturl()
\ No newline at end of file
+    return parsed.geturl()
diff --git a/solvebio/cli/auth.py b/solvebio/cli/auth.py
index c215bf84..ba147243 100644
--- a/solvebio/cli/auth.py
+++ b/solvebio/cli/auth.py
@@ -81,4 +81,4 @@ def print_user(user):
     email = user['email']
     domain = user['account']['domain']
     print(f'You are logged-in to the "{domain}" domain as {email}'
-        f' (server: {solvebio.get_api_host()}).')
+          f' (server: {solvebio.get_api_host()}).')
diff --git a/solvebio/cli/credentials.py b/solvebio/cli/credentials.py
index a28c9051..0e2d155d 100644
--- a/solvebio/cli/credentials.py
+++ b/solvebio/cli/credentials.py
@@ -109,7 +109,7 @@ def get_credentials(api_host: str = None) -> ApiCredentials:
         # available option that ends with '.api.quartzbio.com',
         netrc_host = next(
             filter(lambda h: h.endswith(".api.quartzbio.com"), netrc_obj.hosts), None
-            )
+        )
 
     # Otherwise use the first available.
     if netrc_host is None:
diff --git a/solvebio/cli/data.py b/solvebio/cli/data.py
index 6ca60392..9917ab1b 100644
--- a/solvebio/cli/data.py
+++ b/solvebio/cli/data.py
@@ -1044,10 +1044,6 @@ def _ls(full_path, recursive=False, follow_shortcuts=False):
     return files
 
 
-def _is_single_file(objects):
-    return len(objects) == 1 and objects[0].get("object_type") == "file"
-
-
 def should_tag_by_object_type(args, object_):
     """Returns True if object matches object type requirements"""
     valid = True