--no-cache-dir Disable the cache.

--disable-pip-version-check

Don't periodically check PyPI to determine whether a new version of pip is available for

download. Implied with --no-index.

--no-color Suppress colored output.

--no-python-version-warning

Silence deprecation warnings for upcoming unsupported Pythons.

--use-feature Enable new functionality, that may be backward incompatible.

--use-deprecated Enable deprecated functionality, that will be removed in the future.

C:\Users\Jilil>

C:\Users\Jilil>pip list

Package Version

--------------- ----------

beautifulsoup4 4.9.0

certifi 2020.4.5.1

chardet 3.0.4

idna 2.9

lxml 4.5.0

numpy 1.18.3

pandas 1.0.3

pip 21.0.1

prettytable 0.7.2

PyMySQL 0.9.3

python-dateutil 2.8.1

pytz 2019.3

requests 2.23.0

setuptools 41.2.0

six 1.14.0

soupsieve 2.0

urllib3 1.25.9

C:\Users\Jilil>

C:\Users\Jilil>pip list

Fatal error in launcher: Unable to create process using '"e:\app\python\python.exe" "E:\app\Python\Python3.9\Scripts\pip.exe" list': ???????????

C:\Users\Jilil>

C:\Users\Jilil>python -m pip install

ERROR: You must give at least one requirement to install (see "pip help install")

WARNING: You are using pip version 20.2.3; however, version 21.0.1 is available.

You should consider upgrading via the 'E:\app\Python\Python3.9\python.exe -m pip install --upgrade pip' command.

C:\Users\Jilil>

C:\Users\Jilil>python -m pip install --upgrade pip

Collecting pip

Using cached pip-21.0.1-py3-none-any.whl (1.5 MB)

Installing collected packages: pip

Attempting uninstall: pip

Found existing installation: pip 20.2.3

Uninstalling pip-20.2.3:

Successfully uninstalled pip-20.2.3

Successfully installed pip-21.0.1

C:\Users\Jilil>pip list

Package Version

---------- -------

pip 21.0.1

setuptools 49.2.1

Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))) - skipping

C:\Users\Jilil>

C:\Users\Jilil>pip install selenium

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))': /simple/selenium/

WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))': /simple/selenium/

WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))': /simple/selenium/

WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))': /simple/selenium/

WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))': /simple/selenium/

Could not fetch URL https://pypi.org/simple/selenium/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/selenium/ (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))) - skipping

ERROR: Could not find a version that satisfies the requirement selenium

ERROR: No matching distribution found for selenium

Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))) - skipping

C:\Users\Jilil>pip install --trusted-host pypiorg --trusted-host files.pythonhoste.org selenium

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))': /simple/selenium/

WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))': /simple/selenium/

WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))': /simple/selenium/

WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))': /simple/selenium/

WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))': /simple/selenium/

Could not fetch URL https://pypi.org/simple/selenium/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/selenium/ (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))) - skipping

ERROR: Could not find a version that satisfies the requirement selenium

ERROR: No matching distribution found for selenium

Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))) - skipping

C:\Users\Jilil>

Reference: https://stackoverflow.com/questions/25981703/pip-install-fails-with-connection-error-ssl-certificate-verify-failed-certi

Solution:

pip install --trusted-host pypi.org --trusted-host files.pythonhosted.org

以上pip那么多报错 怎么都搞不定，都是因为我将pip升级了。重装python和pip之后并且不升级pip就可以正常安装package了

C:\Users\Jilil>pip list

Package Version

---------- -------

pip 20.2.3

setuptools 49.2.1

WARNING: You are using pip version 20.2.3; however, version 21.0.1 is available.

You should consider upgrading via the 'e:\app\python\python38\python.exe -m pip install --upgrade pip' command.

C:\Users\Jilil>python

Python 3.8.8 (tags/v3.8.8:024d805, Feb 19 2021, 13:18:16) [MSC v.1928 64 bit (AMD64)] on win32

Type "help", "copyright", "credits" or "license" for more information.

>>> exit()

C:\Users\Jilil>

C:\Users\Jilil>pip install selenium

Collecting selenium

Downloading selenium-3.141.0-py2.py3-none-any.whl (904 kB)

|████████████████████████████████| 904 kB 5.1 kB/s

Collecting urllib3

Downloading urllib3-1.26.3-py2.py3-none-any.whl (137 kB)

|████████████████████████████████| 137 kB 10.0 kB/s

Installing collected packages: urllib3, selenium

Successfully installed selenium-3.141.0 urllib3-1.26.3

WARNING: You are using pip version 20.2.3; however, version 21.0.1 is available.

You should consider upgrading via the 'e:\app\python\python38\python.exe -m pip install --upgrade pip' command.

C:\Users\Jilil>pip install bs4

Collecting bs4

Downloading bs4-0.0.1.tar.gz (1.1 kB)

Collecting beautifulsoup4

Downloading beautifulsoup4-4.9.3-py3-none-any.whl (115 kB)

|████████████████████████████████| 115 kB 53 kB/s

Collecting soupsieve>1.2; python_version >= "3.0"

Downloading soupsieve-2.2-py3-none-any.whl (33 kB)

Using legacy 'setup.py install' for bs4, since package 'wheel' is not installed.

Installing collected packages: soupsieve, beautifulsoup4, bs4

Running setup.py install for bs4 … done

Successfully installed beautifulsoup4-4.9.3 bs4-0.0.1 soupsieve-2.2

WARNING: You are using pip version 20.2.3; however, version 21.0.1 is available.

You should consider upgrading via the 'e:\app\python\python38\python.exe -m pip install --upgrade pip' command.

C:\Users\Jilil>

以后看到

WARNING: You are using pip version 20.2.3; however, version 21.0.1 is available.

You should consider upgrading via the 'e:\app\python\python38\python.exe -m pip install --upgrade pip' command.

不要鸟它就是了