Minor bugfixes (#7891)

* Fix dangerous default argument

* Remove unused imports

* Remove unnecessary comprehension

* Use literal syntax to create data structure

* Use literal syntax instead of function calls to create data structure

Co-authored-by: deepsource-autofix[bot] <62050782+deepsource-autofix[bot]@users.noreply.github.com>

tools/_venv_common.py

@@ -124,7 +124,9 @@ def _check_version(version_str, major_version):
     return False
 
 
-def subprocess_with_print(cmd, env=os.environ, shell=False):
+def subprocess_with_print(cmd, env=None, shell=False):
+    if env is None:
+        env = os.environ
     print('+ {0}'.format(subprocess.list2cmdline(cmd)) if isinstance(cmd, list) else cmd)
     subprocess.check_call(cmd, env=env, shell=shell)
 

tools/deactivate.py

@@ -17,7 +17,6 @@ import sys
 
 from cryptography.hazmat.backends import default_backend
 from cryptography.hazmat.primitives import serialization
-from cryptography.hazmat.primitives.asymmetric import rsa
 import josepy as jose
 
 from acme import client as acme_client