sys

import sys
sys.modules.keys()
dict_keys(['sys', 'builtins', '_frozen_importlib', '_imp', '_thread', '_warnings', '_weakref', '_io', 'marshal', 'nt', 'winreg', '_frozen_importlib_external', 'time', 'zipimport', '_codecs', 'codecs', 'encodings.aliases', 'encodings', 'encodings.utf_8', '_codecs_cn', '_multibytecodec', 'encodings.gbk', '_signal', 'encodings.latin_1', '_abc', 'abc', 'io', 'main', '_stat', 'stat', '_collections_abc', 'genericpath', 'ntpath', 'os.path', 'os', '_sitebuiltins', '_locale', '_bootlocale', 'site', 'atexit', 'importlib._bootstrap', 'importlib._bootstrap_external', 'types', 'warnings', 'importlib', 'importlib.machinery', '_heapq', 'heapq', 'itertools', 'keyword', '_operator', 'operator', 'reprlib', '_collections', 'collections', 'collections.abc', '_functools', 'functools', 'contextlib', 'enum', '_sre', 'sre_constants', 'sre_parse', 'sre_compile', 'copyreg', 're', 'typing.io', 'typing.re', 'typing', 'importlib.abc', 'importlib.util', '_ast', 'ast', '_opcode', 'opcode', 'dis', 'token', 'tokenize', 'linecache', 'inspect', '_weakrefset', 'weakref', 'pkgutil', 'errno', 'signal', 'threading', 'msvcrt', '_winapi', 'subprocess', 'platform', 'sysconfig', 'urllib', 'urllib.parse', 'traceback', 'pydoc', 'posixpath', 'fnmatch', 'zlib', '_compression', '_bz2', 'bz2', '_lzma', 'lzma', 'shutil', 'math', '_bisect', 'bisect', '_random', '_sha512', 'random', 'tempfile', '_string', 'string'])