wind@wind-ThinkPad-X250:~/Downloads/PyQt5_gpl-5.12.2$ python3 -m pip install PyQt5
Collecting PyQt5
 Downloading https://files.pythonhosted.org/packages/6a/f4/6a63aafcee3efd2b156dc835d9c85ca99b24e80f8af89b6da5c46054fe43/PyQt5-5.12.2-5.12.3-cp35.cp36.cp37.cp38-abi3-manylinux1_x86_64.whl (61.5MB)
  100% |████████████████████████████████| 61.5MB 18kB/s 
Collecting PyQt5_sip<13,>=4.19.14 (from PyQt5)
 Downloading https://files.pythonhosted.org/packages/08/19/ef6b97cfdbb8f9312d71388384f572706e40bf88f07fffb0fc64846b4a36/PyQt5_sip-4.19.17-cp35-cp35m-manylinux1_x86_64.whl (67kB)
  100% |████████████████████████████████| 71kB 107kB/s 
Installing collected packages: PyQt5-sip, PyQt5
Successfully installed PyQt5-5.12.2 PyQt5-sip-4.19.17
You are using pip version 8.1.1, however version 19.1.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
wind@wind-ThinkPad-X250:~/Downloads/PyQt5_gpl-5.12.2$ 

>>> import sys
>>> sys.modules.keys()
dict_keys(['problem_report', '_bz2', 'email.feedparser', 'email.mime', 'base64', 'select', 'tarfile', '__future__', '_compat_pickle', 'importlib.util', 'mpl_toolkits', 'json.scanner', 'signal', 'json', 're', 'subprocess', 'ipaddress', 'configparser', '_functools', 'bz2', 'uu', 'pyexpat', 'copyreg', '__main__', 'selectors', 'apt.package', 'PyQt5', 'xml', 'pyexpat.errors', '_json', '_thread', 'email.message', 'apt.cdrom', 'calendar', 'importlib.abc', 'textwrap', 'random', 'email.mime.text', 'email._encoded_words', 'email._parseaddr', 'shutil', 'atexit', 'sre_parse', '_frozen_importlib_external', 'importlib.machinery', '_compression', 'zlib', 'copy', 'fcntl', '_weakref', 'sitecustomize', 'collections.abc', 'apport_python_hook', 'email.header', 'email.errors', '_io', '_operator', 'email.encoders', '_string', 'contextlib', '_frozen_importlib', '_pickle', 'apt.cache', 'token', '_signal', '_collections_abc', 'email._policybase', 'apt.progress', 'encodings.utf_8', 'genericpath', '_hashlib', 'heapq', '_socket', '_stat', 'site', 'sysconfig', 'xml.dom.minicompat', 'socket', '_struct', 'string', 'email.charset', 'importlib', 'pyexpat.model', 'gzip', 'codecs', '_warnings', 'apport.packaging_impl', 'threading', 'encodings', 'builtins', 'enum', 'binascii', 'http', 'itertools', 'operator', '_ssl', 'xml.parsers.expat', '_datetime', 'glob', '_locale', '_random', 'apport.fileutils', 'xml.dom.NodeFilter', '_posixsubprocess', 'abc', 'urllib.error', 'datetime', 'sre_constants', 'json.encoder', 'encodings.aliases', 'reprlib', '_weakrefset', 'json.decoder', 'importlib._bootstrap_external', 'sre_compile', 'email.mime.base', 'email.parser', 'math', 'keyword', 'encodings.latin_1', 'linecache', '_heapq', 'urllib', 'apport', 'tokenize', 'importlib._bootstrap', 'urllib.response', 'xml.parsers.expat.errors', 'apport.report', 'apport.packaging', 'posixpath', 'gettext', 'xml.dom.xmlbuilder', 'xml.dom', 'pwd', 'os', '_sysconfigdata_m', '_sitebuiltins', 'errno', 'xml.parsers.expat.model', 'os.path', '_sysconfigdata', '_sre', 'email.mime.multipart', 'collections', 'apt.progress.base', 'traceback', 'apt', 'io', 'weakref', 'urllib.request', 'hashlib', 'email.iterators', 'quopri', 'http.client', 'zipimport', '_imp', 'sys', 'rlcompleter', '_bootlocale', 'locale', 'urllib.parse', 'fnmatch', 'tempfile', 'xml.dom.domreg', '_codecs', 'bisect', 'email.utils', 'email.mime.nonmultipart', '_bisect', 'stat', 'warnings', 'ssl', 'functools', 'email', 'grp', '_lzma', 'email.quoprimime', 'struct', 'apt.progress.text', 'time', 'xml.parsers', 'email.base64mime', 'apt_pkg', 'pickle', 'imp', 'types', 'xml.dom.minidom', 'lzma', 'marshal', '_collections', 'readline', 'posix'])
>>> 

wind@wind-ThinkPad-X250:~$ sudo python3 -m pip uninstall PyQt5
[sudo] password for wind: 
WARNING: The directory '/home/wind/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Uninstalling PyQt5-5.12.2:
 Would remove:
  /home/wind/.local/bin/pylupdate5
  /home/wind/.local/bin/pyrcc5
  /home/wind/.local/bin/pyuic5
  /home/wind/.local/lib/python3.5/site-packages/PyQt5-5.12.2.dist-info/*
  /home/wind/.local/lib/python3.5/site-packages/PyQt5/*
 Would not remove (might be manually added):
  /home/wind/.local/lib/python3.5/site-packages/PyQt5/sip.so
Proceed (y/n)? y
 Successfully uninstalled PyQt5-5.12.2
wind@wind-ThinkPad-X250:~$ 

#!/bin/env python3 
# -*- coding: utf-8 -*- 
 
import sys
from PyQt5.QtWidgets import QApplication, QWidget  #導(dǎo)入相應(yīng)的包
 
if __name__ == '__main__':
 
   app = QApplication(sys.argv)     #創(chuàng)建QApplication對(duì)象是必須，管理整個(gè)>程序，參數(shù)可有可無(wú)，有的話可接收命令行參數(shù)
 
   w = QWidget()            #創(chuàng)建窗體對(duì)象，
   w.resize( 250, 150 )         #設(shè)置窗體大小
   w.move( 100, 300 )          #設(shè)置在屏幕上的顯示位置
   w.setWindowTitle( 'Simple' )     #設(shè)置窗口標(biāo)題
   w.show()               #窗口顯示
 
   sys.exit( app.exec_() )