一般我们在安装或者调用pip库的时候，会告诉你pip版本较低，需要你升级，比如我的本机是如下。
一、 我是直接cd到我pip目录文件下查看版本：
E:\Program Files (x86)\python\Scripts>pip show pip
Name: pip
Version: 10.0.1
Summary: The PyPA recommended tool for installing Python packages.
Home-page: https://pip.pypa.io/
Author: The pip developers
Author-email: [email protected]
License: MIT
Location: e:\program files (x86)\python\lib\site-packages
Requires:
Required-by:
You are using pip version 10.0.1, however version 19.0.3 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.特别是Required-by:以及命令窗中黄色的字，
提示我可用的有19.0.3的版本可用，说明我的pip版本太低了，需要升级。
二、在命令窗中我按照要求，进行升级，敲入‘python -m pip install --upgrade pip’，但是提示我安装失败。
E:\Program Files (x86)\python\Scripts>python -m pip install --upgrade pip
Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)",)': /simple/pip/
Collecting pip
Downloading https://files.pythonhosted.org/packages/d8/f3/413bab4ff08e1fc4828dfc59996d721917df8e8583ea85385d51125dceff/pip-19.0.3-py2.py3-none-any.whl (1.4MB)
99% |███████████████████████████████▊| 1.3MB 74kB/s eta 0:00:01Exception:
Traceback (most recent call last):
File "E:\Program Files (x86)\python\lib\site-packages\pip\_internal\basecommand.py", line 228, in main
status = self.run(options, args)
File "E:\Program Files (x86)\python\lib\site-packages\pip\_internal\commands\install.py", line 291, in run
resolver.resolve(requirement_set)
File "E:\Program Files (x86)\python\lib\site-packages\pip\_internal\resolve.py", line 103, in resolve
self._resolve_one(requirement_set, req)
File "E:\Program Files (x86)\python\lib\site-packages\pip\_internal\resolve.py", line 257, in _resolve_one
abstract_dist = self._get_abstract_dist_for(req_to_install)
File "E:\Program Files (x86)\python\lib\site-packages\pip\_internal\resolve.py", line 210, in _get_abstract_dist_for
self.require_hashes
File "E:\Program Files (x86)\python\lib\site-packages\pip\_internal\operations\prepare.py", line 310, in prepare_linked_requirement
progress_bar=self.progress_bar
File "E:\Program Files (x86)\python\lib\site-packages\pip\_internal\download.py", line 837, in unpack_url
progress_bar=progress_bar
File "E:\Program Files (x86)\python\lib\site-packages\pip\_internal\download.py", line 674, in unpack_http_url
progress_bar)
File "E:\Program Files (x86)\python\lib\site-packages\pip\_internal\download.py", line 898, in _download_http_url
_download_url(resp, link, content_file, hashes, progress_bar)
File "E:\Program Files (x86)\python\lib\site-packages\pip\_internal\download.py", line 618, in _download_url
hashes.check_against_chunks(downloaded_chunks)
File "E:\Program Files (x86)\python\lib\site-packages\pip\_internal\utils\hashes.py", line 48, in check_against_chunks
for chunk in chunks:
File "E:\Program Files (x86)\python\lib\site-packages\pip\_internal\download.py", line 586, in written_chunks
for chunk in chunks:
File "E:\Program Files (x86)\python\lib\site-packages\pip\_internal\utils\ui.py", line 159, in iter
for x in it:
File "E:\Program Files (x86)\python\lib\site-packages\pip\_internal\download.py", line 575, in resp_read
decode_content=False):
File "E:\Program Files (x86)\python\lib\site-packages\pip\_vendor\urllib3\response.py", line 436, in stream
data = self.read(amt=amt, decode_content=decode_content)
File "E:\Program Files (x86)\python\lib\site-packages\pip\_vendor\urllib3\response.py", line 401, in read
raise IncompleteRead(self._fp_bytes_read, self.length_remaining)
File "E:\Program Files (x86)\python\lib\contextlib.py", line 35, in __exit__
self.gen.throw(type, value, traceback)
File "E:\Program Files (x86)\python\lib\site-packages\pip\_vendor\urllib3\response.py", line 316, in _error_catcher
raise ReadTimeoutError(self._pool, None, 'Read timed out.')
ReadTimeoutError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Read timed out.
You are using pip version 10.0.1, however version 19.0.3 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.这个时候我看到，检查升级不能覆盖，这个时候可以去到你的安装目录，找到site-packages文件夹，把原来的pip-10.0.1.dist-info这个消息目录删除，（经过询问，很多同学的安装不成功都是和这个目录有关系）。下图我是删除后重新升级并自动升级的目录。
三、 再次运行python -m pip install --upgrade pip 后升级成功，之前不能安装的包也能安装了！
是不是很开心？！
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