gh-106200: Remove unused imports (#106201)

Lib/poplib.py

@@ -451,7 +451,6 @@ if HAVE_SSL:
     __all__.append("POP3_SSL")
 
 if __name__ == "__main__":
-    import sys
     a = POP3(sys.argv[1])
     print(a.getwelcome())
     a.user(sys.argv[2])

Lib/test/test_capi/test_misc.py

@@ -1823,7 +1823,6 @@ class SubinterpreterTest(unittest.TestCase):
         1-to-1 with the new interpreter's settings.  This test verifies
         that they match.
         """
-        import json
 
         OBMALLOC = 1<<5
         EXTENSIONS = 1<<8
@@ -1902,7 +1901,6 @@ class SubinterpreterTest(unittest.TestCase):
         This verifies that the override works but does not modify
         the underlying setting.
         """
-        import json
 
         OBMALLOC = 1<<5
         EXTENSIONS = 1<<8

Lib/test/test_tokenize.py

@@ -6,7 +6,6 @@ from io import BytesIO, StringIO
 from textwrap import dedent
 from unittest import TestCase, mock
 from test import support
-from test.support import os_helper
 from test.test_grammar import (VALID_UNDERSCORE_LITERALS,
                                INVALID_UNDERSCORE_LITERALS)
 from test.support import os_helper

Tools/cases_generator/lexer.py

@@ -3,7 +3,6 @@
 # https://gist.github.com/markshannon/db7ab649440b5af765451bb77c7dba34
 
 import re
-import sys
 from dataclasses import dataclass
 
 def choice(*opts):