blocks|key|1856300|text|您一定是无意中升级了系统pip+(可能是通过sudo+pip+install+pip+--upgrade之类的东西)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1856301|pip+10.x调整其内部部件所在的位置。您看到的pip3命令是由您的包维护者提供的命令(可能是基于这里的debian？)并且不是由pip管理的文件。|1856302|你可以在pip's+issue+tracker上阅读更多关于这方面的内容|1856303|您可能不想升级您的系统pip，而是使用virtualenv。|1856304|要恢复pip3二进制文件，您需要使用sudo+python3+-m+pip+uninstall+pip+&&+sudo+apt+install+python3-pip+--reinstall命令。|1856305|如果您想继续在“不受支持的领域”(在系统包管理器之外升级系统包)，您可能可以使用python3+-m+pip+...而不是pip3。|1856306|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/pypa/pip/issues/5221^0|M|U|0|P|4|0|4|J|0|0|0|3|4|I|25|0|14|I|1P|4|0^^$0|@$1|2|3|4|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|13|8|@]|D|@$9|14|A|15|1|16]]|E|$]]|$1|J|3|K|5|6|7|17|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|18|8|@$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|N|3|O|5|6|7|1D|8|@$9|1E|A|1F|B|C]|$9|1G|A|1H|B|C]]|D|@]|E|$]]|$1|P|3|-4|5|6|7|1I|8|@]|D|@]|E|$]]]|Q|$R|$5|S|T|U|E|$V|W]]]]

You must have inadvertently upgraded your system pip (probably through something like <code>sudo pip install pip --upgrade</code>)

pip 10.x adjusts where its internals are situated. The <code>pip3</code> command you're seeing is one provided by your package maintainer (presumably debian based here?) and is not a file managed by pip.

You can read more about this on <a href="https://github.com/pypa/pip/issues/5221" rel="noreferrer">pip's issue tracker</a>

You'll probably want to not upgrade your system pip and instead use a virtualenv.

To recover the <code>pip3</code> binary you'll need to <code>sudo python3 -m pip uninstall pip &amp;&amp; sudo apt install python3-pip --reinstall</code>.

If you want to continue in "unsupported territory" (upgrading a system package outside of the system package manager), you can probably get away with <code>python3 -m pip ...</code> instead of <code>pip3</code>.

blocks|key|1642058|text|检查pip是否已缓存在另一个路径上，要执行此操作，请调用$+which+pip并检查该路径是否与错误中提示的路径不同，如果是这样，请运行：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1642059|$+hash+-r|code-block|syntax|javascript|1642060|当缓存被清除时，pip将再次工作。参考：http://cheng.logdown.com/posts/2015/06/14/-usr-bin-pip-no-such-file-or-directory|offset|length|1642061|entityMap|0|LINK|mutability|MUTABLE|url|http://cheng.logdown.com/posts/2015/06/14/-usr-bin-pip-no-such-file-or-directory^0|0|0|K|28|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Check if pip has been cached on another path, to do so, call $ which pip and check that the path is different from the one prompted in the error, if that's the case run:

<pre><code>$ hash -r
</code></pre>

When the cache is clear, pip will be working again.
reference: <a href="http://cheng.logdown.com/posts/2015/06/14/-usr-bin-pip-no-such-file-or-directory" rel="noreferrer">http://cheng.logdown.com/posts/2015/06/14/-usr-bin-pip-no-such-file-or-directory</a>

blocks|key|1642116|text|我使用sudo+apt+remove+python3-pip，然后pip就可以工作了。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1642117|+~+sudo+pip+install+pip+--upgrade
[sudo]+password+for+sen:+
Traceback+(most+recent+call+last):
++File+"/usr/bin/pip",+line+9,+in+<module>
++++from+pip+import+main
ImportError:+cannot+import+name+'main'
➜++~+sudo+apt+remove+python3-pip+++
Reading+package+lists...+Done
Building+dependency+tree+++++++
Reading+state+information...+Done
The+following+packages+were+automatically+installed+and+are+no+longer+required:
++libexpat1-dev+libpython3-dev+libpython3.5-dev+python-pip-whl+python3-dev+python3-wheel
++python3.5-dev
Use+'sudo+apt+autoremove'+to+remove+them.
The+following+packages+will+be+REMOVED:
++python3-pip
0+upgraded,+0+newly+installed,+1+to+remove+and+0+not+upgraded.
After+this+operation,+569+kB+disk+space+will+be+freed.
Do+you+want+to+continue?+[Y/n]+y
(Reading+database+...+215769+files+and+directories+currently+installed.)
Removing+python3-pip+(8.1.1-2ubuntu0.4)+...
Processing+triggers+for+man-db+(2.7.5-1)+...
➜++~+pip

Usage:+++
++pip+<command>+[options]|code-block|syntax|javascript|1642118|entityMap^0|3|R|X|3|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

I use <code>sudo apt remove python3-pip</code> then <code>pip</code> works. 

<pre><code> ~ sudo pip install pip --upgrade
[sudo] password for sen: 
Traceback (most recent call last):
 File "/usr/bin/pip", line 9, in &lt;module&gt;
 from pip import main
ImportError: cannot import name 'main'
➜ ~ sudo apt remove python3-pip 
Reading package lists... Done
Building dependency tree 
Reading state information... Done
The following packages were automatically installed and are no longer required:
 libexpat1-dev libpython3-dev libpython3.5-dev python-pip-whl python3-dev python3-wheel
 python3.5-dev
Use 'sudo apt autoremove' to remove them.
The following packages will be REMOVED:
 python3-pip
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
After this operation, 569 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 215769 files and directories currently installed.)
Removing python3-pip (8.1.1-2ubuntu0.4) ...
Processing triggers for man-db (2.7.5-1) ...
➜ ~ pip

Usage: 
 pip &lt;command&gt; [options]
</code></pre>

blocks|key|1856425|text|我在我的Ubuntu+16.04系统上遇到了同样的问题。我设法用以下命令重新安装pip来修复它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1856426|curl+https://bootstrap.pypa.io/get-pip.py+%7C+sudo+python3|offset|length|style|CODE|1856427|entityMap^0|0|0|1K|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

I met the same problem on my Ubuntu 16.04 system. I managed to fix it by re-installing pip with the following command:

<code>curl https://bootstrap.pypa.io/get-pip.py | sudo python3</code>

blocks|key|1856429|text|同样的事情也发生在我使用新的LXC+(strech)的Pixelbook上。这个解决方案与公认的解决方案非常相似，只有一个细微的区别，那就是为我修复了pip3。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1856430|sudo+python3+-m+pip+install+--upgrade+pip|code-block|syntax|javascript|1856431|这颠覆了版本，现在它像预期的那样工作。|1856432|我在这里找到的..。Python.org：Ensure+pip+is+up-to-date|offset|length|1856433|entityMap|0|LINK|mutability|MUTABLE|url|https://packaging.python.org/tutorials/installing-packages/#ensure-pip-setuptools-and-wheel-are-up-to-date^0|0|0|0|L|O|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

Same thing happened to me on Pixelbook using the new LXC (strech). This solution is very similar to the accepted one, with one subtle difference, whiched fixed pip3 for me.

<pre><code>sudo python3 -m pip install --upgrade pip
</code></pre>

That bumped the version, and now it works as expected.

I found it here ... Python.org: <a href="https://packaging.python.org/tutorials/installing-packages/#ensure-pip-setuptools-and-wheel-are-up-to-date" rel="noreferrer">Ensure pip is up-to-date</a>

blocks|key|1856437|text|使用python3+-m+pip+install+--user+pip==9.0.1+(或工作的版本)进行恢复|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1856438|entityMap^0|2|14|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Recover with <code>python3 -m pip install --user pip==9.0.1</code> (or the version that worked)

blocks|key|1856440|text|上面的命令对我不起作用，但它们非常有用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1856441|sudo+apt+purge+python3-pip
sudo+rm+-rf+'/usr/lib/python3/dist-packages/pip'++
sudo+apt+install+python3-pip
cd
cd+.local/lib/python3/site-packages
sudo+rm+-rf+pip*++
cd
cd+.local/lib/python3.5/site-packages
sudo+rm+-rf+pip*++
sudo+pip3+install+jupyter|code-block|syntax|javascript|1856442|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

The commands above didn't work for me but those were very helpful:

<pre><code>sudo apt purge python3-pip
sudo rm -rf '/usr/lib/python3/dist-packages/pip' 
sudo apt install python3-pip
cd
cd .local/lib/python3/site-packages
sudo rm -rf pip* 
cd
cd .local/lib/python3.5/site-packages
sudo rm -rf pip* 
sudo pip3 install jupyter
</code></pre>

blocks|key|1642180|text|从pip._internal导入main|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1642181|from+pip._internal+import+main|code-block|syntax|javascript|1642182|从编辑pip代码|1642183|sudo+nano+/usr/bin/pip3|1642184|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<h2>import main from pip._internal</h2>

<pre><code>from pip._internal import main
</code></pre>

Edit the pip code from

<pre><code>sudo nano /usr/bin/pip3
</code></pre>

blocks|key|1856488|text|我也有同样的问题并解决了它。这是我的解决方案。首先，当我运行pip+install某件东西时，错误如下：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1856489|Traceback+(most+recent+call+last):
++File+"/usr/bin/pip3",+line+9,+in+<module>
++++from+pip+import+main
ImportError:+cannot+import+name+'main'|code-block|syntax|javascript|1856490|因此，我通过cd进入文件/usr/bin/和cat+pip3来查看其中的代码。我看到了这一点：|1856491|#!/usr/bin/python3
#+GENERATED+BY+DEBIAN
import+sys
#+Run+the+main+entry+point,+similarly+to+how+setuptools+does+it,+but+because
#+we+didn't+install+the+actual+entry+point+from+setup.py,+don't+use+the
#+pkg_resources+API.
from+pip+import+main
if+__name__+==+'__main__':
++++sys.exit(main())|1856492|然后我认为它不在安装路径中。所以我cd进入python3-pip，如下所示：|1856493|cd+/.local/lib/python3.5/site-packages/pip|1856494|附言:你必须在你的计算机中cd到正确的方向，然后我cat文件来查看不同之处(你可以使用其他操作来查看代码)：|offset|length|style|CODE|1856495|cat+__main__.py|1856496|我看到了这个：|1856497|from+__future__+import+absolute_import
import+os
import+sys
#+If+we+are+running+from+a+wheel,+add+the+wheel+to+sys.path
#+This+allows+the+usage+python+pip-*.whl/pip+install+pip-*.whl
if+__package__+==+'':
++++#+__file__+is+pip-*.whl/pip/__main__.py
++++#+first+dirname+call+strips+of+'/__main__.py',+second+strips+off+'/pip'
++++#+Resulting+path+is+the+name+of+the+wheel+itself
++++#+Add+that+to+sys.path+so+we+can+import+pip
++++path+=+os.path.dirname(os.path.dirname(__file__))
++++sys.path.insert(0,+path)

from+pip._internal+import+main+as+_main++#+isort:skip+#+noqa

if+__name__+==+'__main__':
++++sys.exit(_main())|1856498|那么，你能看出其中的区别吗？我可以确定，我必须使该文件与/usr/bin/pip3中的文件相同|1856499|因此，我复制了/.local/lib/python3.5/site-package/pip中的代码来替换/usr/bin/pip3中的代码，问题就消失了！|1856500|附言:在这个问题上，pip3和pip没有区别。如果我的解决方案能解决你的问题，我会很高兴的！|1856501|entityMap^0|0|0|0|0|0|0|D|2|P|3|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|19|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1A|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|1B|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|1C|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|1D|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|1E|8|@$Q|1F|R|1G|S|T]|$Q|1H|R|1I|S|T]]|9|@]|A|$]]|$1|U|3|V|5|D|7|1J|8|@]|9|@]|A|$E|F]]|$1|W|3|X|5|6|7|1K|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|D|7|1L|8|@]|9|@]|A|$E|F]]|$1|10|3|11|5|6|7|1M|8|@]|9|@]|A|$]]|$1|12|3|13|5|6|7|1N|8|@]|9|@]|A|$]]|$1|14|3|15|5|6|7|1O|8|@]|9|@]|A|$]]|$1|16|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]]|17|$]]

I have the same problem and solved it. Here is my solution.
First, when I run pip install something, the error came out like this:

<pre><code>Traceback (most recent call last):
 File "/usr/bin/pip3", line 9, in &lt;module&gt;
 from pip import main
ImportError: cannot import name 'main'
</code></pre>

So, I cd into the file /usr/bin/ and cat pip3 to see the code in it. I see this in it:

<pre><code>#!/usr/bin/python3
# GENERATED BY DEBIAN
import sys
# Run the main entry point, similarly to how setuptools does it, but because
# we didn't install the actual entry point from setup.py, don't use the
# pkg_resources API.
from pip import main
if __name__ == '__main__':
 sys.exit(main())
</code></pre>

And then I think that it was not in the installation path. So I cd into the python3-pip, like this:

<pre><code>cd /.local/lib/python3.5/site-packages/pip
</code></pre>

P.S.: you have to <code>cd</code> into the right directions in your computer
Then I <code>cat</code> the file to see the differences(you can use other operations to see the code):

<pre><code>cat __main__.py
</code></pre>

And I saw this:

<pre><code>from __future__ import absolute_import
import os
import sys
# If we are running from a wheel, add the wheel to sys.path
# This allows the usage python pip-*.whl/pip install pip-*.whl
if __package__ == '':
 # __file__ is pip-*.whl/pip/__main__.py
 # first dirname call strips of '/__main__.py', second strips off '/pip'
 # Resulting path is the name of the wheel itself
 # Add that to sys.path so we can import pip
 path = os.path.dirname(os.path.dirname(__file__))
 sys.path.insert(0, path)

from pip._internal import main as _main # isort:skip # noqa

if __name__ == '__main__':
 sys.exit(_main())
</code></pre>

So, can you see the difference? I can figure out that I have to make the file the same as the file in /usr/bin/pip3

So, I copied the code in /.local/lib/python3.5/site-packages/pip to replace the code in /usr/bin/pip3
and the problem disappear!

P.S.: pip3 or pip have no difference in this problem.
I will be happy if my solution solve your problem!

blocks|key|1642248|text|就像@cryptoboy所说的--检查你安装的pip/python版本|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1642249|+demon@UbuntuHP:~$+pip+-V
+demon@UbuntuHP:~$+pip2+-V
+demon@UbuntuHP:~$+pip3+-V|code-block|syntax|javascript|1642250|然后检查.local/lib/文件夹中是否有不需要的库。|1642251|当我迁移到较新的Kubuntu时，我备份了一些设置，并在我的home目录下的.local/lib/python2.7/文件夹中进行了备份。安装了python+3.6。我刚刚删除了旧文件夹，现在一切都很好！|1642252|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

As @cryptoboy said - check what pip/python version you have installed

<pre><code> demon@UbuntuHP:~$ pip -V
 demon@UbuntuHP:~$ pip2 -V
 demon@UbuntuHP:~$ pip3 -V
</code></pre>

and then check for no-needed libraries in your .local/lib/ folder.

I did backup of settings when I was migrating to newer Kubuntu and in had .local/lib/python2.7/ folder in my home directory. Installed python 3.6. I just removed the old folder and now everything works great!

blocks|key|1642267|text|对于Python2.7版，@Anthony+solution完美工作，将python3更改为Python，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1642268|sudo+python+-m+pip+uninstall+pip+&&+sudo+apt+install+python-pip+--reinstall|code-block|syntax|javascript|1642269|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For Python version 2.7 @Anthony solution works perfect, by changing python3 to python as follows:

<pre><code>sudo python -m pip uninstall pip &amp;&amp; sudo apt install python-pip --reinstall
</code></pre>

blocks|key|1856525|text|我遇到了同样的错误，但是python+-m+pip仍然在工作，所以我用核选项sudo+python+-m+pip+install+--upgrade+pip修复了它。它是为我做的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1856526|entityMap^0|C|D|12|14|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

I had this same error, but <code>python -m pip</code> was still working, so I fixed it with the nuclear option <code>sudo python -m pip install --upgrade pip</code>. It did it for me.

blocks|key|1856532|text|在ubuntu+18.04.1+Bionic+Beaver中，您需要注销并重新登录(无需重启)才能获得正确的环境。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1856533|$+sudo+apt+install+python-pip

$+pip+--version
pip+9.0.1+from+/usr/lib/python2.7/dist-packages+(python+2.7)

$+pip+install+--upgrade+pip

$+pip+--version
Traceback+(most+recent+call+last):
++File+"/usr/bin/pip",+line+9,+in+<module>
++++from+pip+import+main
ImportError:+cannot+import+name+main

$+exit
<login>

$+pip+--version
pip+18.1+from+/home/test/.local/lib/python2.7/site-packages/pip+(python+2.7)|code-block|syntax|javascript|1856534|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In ubuntu 18.04.1 Bionic Beaver, you need to log out and log back in (restart not necessary) to get the proper environment.

<pre><code>$ sudo apt install python-pip

$ pip --version
pip 9.0.1 from /usr/lib/python2.7/dist-packages (python 2.7)

$ pip install --upgrade pip

$ pip --version
Traceback (most recent call last):
 File "/usr/bin/pip", line 9, in &lt;module&gt;
 from pip import main
ImportError: cannot import name main

$ exit
&lt;login&gt;

$ pip --version
pip 18.1 from /home/test/.local/lib/python2.7/site-packages/pip (python 2.7)
</code></pre>

blocks|key|1856543|text|在Debian上，你需要先更新APT...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1856544|sudo+apt-get+update+-qq
sudo+apt-get+install+python-pip+-qq
sudo+pip+install+pip+--upgrade+--quiet
sudo+pip2+install+virtualenv+--quiet|code-block|syntax|javascript|1856545|如果您跳过'sudo+apt-get+update+-qq‘，您的pip将会损坏，并显示’找不到主‘错误。|1856546|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

On Debian you will need to update apt first....

<pre><code>sudo apt-get update -qq
sudo apt-get install python-pip -qq
sudo pip install pip --upgrade --quiet
sudo pip2 install virtualenv --quiet
</code></pre>

If you skip 'sudo apt-get update -qq' your pip will become corrupt and display the 'cannot find main' error.

blocks|key|1856548|text|无论如何，我在使用pip+(而不是pip2或pip3)时遇到了问题：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1856549|$+pip+-V
Traceback+(most+recent+call+last):
++File+"/usr/bin/pip",+line+9,+in+<module>
++++from+pip+import+main
ImportError:+cannot+import+name+main

$+pip2+-V
pip+8.1.1+from+/usr/lib/python2.7/dist-packages+(python+2.7)

$+pip3+-V
pip+8.1.1+from+/usr/lib/python3/dist-packages+(python+3.5)|code-block|syntax|javascript|1856550|不知何故(我记不清是怎么回事了)，我在我的~/.local目录中安装了python内容。在我从那里删除了pip目录之后，pip再次开始工作。|1856551|$+rm+-rf+/home/precor/.local/lib/python2.7/site-packages/pip
$+pip+-V
pip+8.1.1+from+/usr/lib/python2.7/dist-packages+(python+2.7)|1856552|entityMap^0|9|3|H|4|M|4|0|0|L|8|1O|3|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|P|$]]

For what it's worth, I had the problem with <code>pip</code> (not <code>pip2</code> or <code>pip3</code>):

<pre><code>$ pip -V
Traceback (most recent call last):
 File "/usr/bin/pip", line 9, in &lt;module&gt;
 from pip import main
ImportError: cannot import name main

$ pip2 -V
pip 8.1.1 from /usr/lib/python2.7/dist-packages (python 2.7)

$ pip3 -V
pip 8.1.1 from /usr/lib/python3/dist-packages (python 3.5)
</code></pre>

Somehow (I can't remember how) I had python stuff installed in my <code>~/.local</code> directory. After I removed the pip directory from there, <code>pip</code> started working again.

<pre><code>$ rm -rf /home/precor/.local/lib/python2.7/site-packages/pip
$ pip -V
pip 8.1.1 from /usr/lib/python2.7/dist-packages (python 2.7)
</code></pre>

blocks|key|1642336|text|在执行任何pip命令之前，请使用以下命令|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1642337|hash+-d+pip|code-block|syntax|javascript|1642338|看起来不错|1642339|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Use the following command before the execution of any pip command 

<pre><code>hash -d pip
</code></pre>

It will work

blocks|key|1642348|text|包有问题，生成de+file+/usr/bin/pip时，需要修改import：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1642349|from+pip+import+main|code-block|syntax|javascript|1642350|至|1642351|from+pip._internal+import+main|1642352|这解决了问题，我不确定它为什么会产生，但它在以下问题中说明了一些事情：|1642353|After+pip+10+upgrade+on+pyenv+"ImportError:+cannot+import+name+'main'"+|offset|length|1642354|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/pypa/pip/issues/5240^0|0|0|0|0|0|0|1Z|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|13|8|@]|9|@$O|14|P|15|1|16]]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

Is something wrong with the packages, when it generating de file /usr/bin/pip,
you have to change the import:

<pre><code>from pip import main
</code></pre>

to

<pre><code>from pip._internal import main
</code></pre>

That solves the problem, I'm not sure why it generated, but it saids somthing in the following issue:

<a href="https://github.com/pypa/pip/issues/5240" rel="nofollow noreferrer">After pip 10 upgrade on pyenv "ImportError: cannot import name 'main'" </a>

blocks|key|1856603|text|您可以尝试这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1856604|sudo+ln+-sf+$(+type+-P+pip+)+/usr/bin/pip|code-block|syntax|javascript|1856605|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can try this: 

<pre><code>sudo ln -sf $( type -P pip ) /usr/bin/pip
</code></pre>

blocks|key|1642388|text|当我想将system+pip+pip3从9.0.1升级到19.2.3时，我也遇到了这个问题。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1642389|运行pip3+install+--upgrade+pip后，pip版本变为19.2.3。但是在最新的版本中，main()已经被移到了pip._internal中，这使得pip3崩溃了。|1642390|因此，在文件/usr/bin/pip3中，将line+9：from+pip+import+main替换为from+pip._internal+import+main。这个问题将被修复，对python2-pip也是如此。(在Ubuntu+18.04发行版上测试)|1642391|根据@vent.h的answer|1642392|entityMap|0|LINK|mutability|MUTABLE|url|https://askubuntu.com/a/1106328/921494^0|B|3|F|4|0|2|Q|U|3|1I|6|1U|D|2C|4|0|6|D|M|6|T|K|1G|U|2L|B|0|A|6|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]|$9|13|A|14|B|C]|$9|15|A|16|B|C]|$9|17|A|18|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|19|8|@$9|1A|A|1B|B|C]|$9|1C|A|1D|B|C]|$9|1E|A|1F|B|C]|$9|1G|A|1H|B|C]|$9|1I|A|1J|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|1K|8|@]|D|@$9|1L|A|1M|1|1N]]|E|$]]|$1|L|3|-4|5|6|7|1O|8|@]|D|@]|E|$]]]|M|$N|$5|O|P|Q|E|$R|S]]]]

I also run into this problem when I wanted to upgrade system <code>pip</code> <code>pip3</code> from 9.0.1 to 19.2.3.

After running <code>pip3 install --upgrade pip</code>, <code>pip</code> version becomes 19.2.3. But <code>main()</code> has been moved in <code>pip._internal</code> in the latest version, which leaves <code>pip3</code> broken.

So in file <code>/usr/bin/pip3</code>, replace <code>line 9</code>: <code>from pip import main</code> with <code>from pip._internal import main</code>. The issue will be fixed, works the same for <code>python2-pip</code>. (Tested on Ubuntu 18.04 distribution)

According to @Vincent H.'s <a href="https://askubuntu.com/a/1106328/921494">answer</a>

blocks|key|1856631|text|请运行以下命令进行修复。运行python3+-m+pip+install+--upgrade+pip后，请执行以下命令。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1856632|hash+-r+pip|code-block|syntax|javascript|1856633|来源：https://github.com/pypa/pip/issues/5221|1856634|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/pypa/pip/issues/5221^0|E|10|0|0|3|13|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Please run the following commands to do the fix. After running <code>python3 -m pip install --upgrade pip</code>, please run the following command.

<pre><code>hash -r pip
</code></pre>

Source: <a href="https://github.com/pypa/pip/issues/5221" rel="nofollow noreferrer">https://github.com/pypa/pip/issues/5221</a>

blocks|key|1642436|text|您可以使用update-alternatives简单地修复pip和pip3路径|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1642437|首先应该检查您当前的$PATH运行echo+$PATH，您可以找到/usr/local/bin，这是pip3和pip通常所在的位置|1642438|您的系统在此处查找/bin/pip和/bin/pip3时发生了更改，因此我建议您通过添加到~/.bash_profile文件中来修复路径，使其保持不变|1642439|然后使用which+pip和which+pip3修复export+PATH=$PATH:/usr/local/bin和check|1642440|如果不是，最后使用update-alternatives来修复它|1642441|update-alternatives+--install+/bin/pip3+pip3+/usr/local/bin/pip3+30|code-block|syntax|javascript|1642442|如果你想让pip指向pip3，那么|1642443|update-alternatives+--install+/bin/pip+pip+/usr/local/bin/pip3+30|1642444|entityMap^0|5|J|0|A|5|H|A|X|E|0|9|8|I|9|19|F|0|4|9|E|A|Q|W|0|9|J|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|C]|$9|16|A|17|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|18|8|@$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]|$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|1F|8|@$9|1G|A|1H|B|C]|$9|1I|A|1J|B|C]|$9|1K|A|1L|B|C]]|D|@]|E|$]]|$1|L|3|M|5|6|7|1M|8|@$9|1N|A|1O|B|C]]|D|@]|E|$]]|$1|N|3|O|5|P|7|1P|8|@]|D|@]|E|$Q|R]]|$1|S|3|T|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|U|3|V|5|P|7|1R|8|@]|D|@]|E|$Q|R]]|$1|W|3|-4|5|6|7|1S|8|@]|D|@]|E|$]]]|X|$]]

you can simply fix the pip and pip3 paths using <code>update-alternatives</code>

first thing you should check is your current <code>$PATH</code>
run <code>echo $PATH</code> and see is you can find <code>/usr/local/bin</code> which is where pip3 and pip usually are

there is a change your system is looking here <code>/bin/pip</code> and <code>/bin/pip3</code>
so i will say fix the PATH by adding to your <code>~/.bash_profile</code> file so it persists 

<code>export PATH=$PATH:/usr/local/bin</code>
and then check is its fixed with <code>which pip</code> and <code>which pip3</code>

if not then use <code>update-alternatives</code> to fix it finally

<pre><code>update-alternatives --install /bin/pip3 pip3 /usr/local/bin/pip3 30
</code></pre>

and if you want to point pip to pip3 then

<pre><code>update-alternatives --install /bin/pip pip /usr/local/bin/pip3 30
</code></pre>

blocks|key|1856669|text|这对我很有效！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1856670|hash+-r+pip+#+or+hash+-d+pip|code-block|syntax|javascript|1856671|现在，卸载已安装的pip版本，然后使用以下命令重新安装它。|1856672|python+-m+pip+uninstall+pip++#+sudo
sudo+apt+install+--reinstall+python-pip|1856673|如果pip损坏，请使用：|1856674|python+-m+pip+install+--force-reinstall+pip|1856675|希望它能帮上忙！|1856676|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

This Worked for me !

<pre><code>hash -r pip # or hash -d pip
</code></pre>

Now, uninstall the pip installed version and reinstall it using the following commands.

<pre><code>python -m pip uninstall pip # sudo
sudo apt install --reinstall python-pip
</code></pre>

If pip is broken, use:

<pre><code>python -m pip install --force-reinstall pip
</code></pre>

Hope it helps!

blocks|key|1856692|text|我使用以下代码加载了一个可能需要安装的模块，从而避免了这个错误(我也得到了这个错误)-使用最新的Python和最新的pip没有任何问题|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1856693|try
++from+colorama+import+Fore,+Back,+Style
except:
++!pip+install+colorama
++from+colorama+import+Fore,+Back,+Style|code-block|syntax|javascript|1856694|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I used the following code to load a module that might need install, thus avoiding this error (which I also got) - using the latest Python and latest pip with no problem
<pre><code>try
 from colorama import Fore, Back, Style
except:
 !pip install colorama
 from colorama import Fore, Back, Style
</code></pre>

Whenever I am trying to install any package using pip, I am getting this import error:

<pre><code>guru@guru-notebook:~$ pip3 install numpy
Traceback (most recent call last):
 File "/usr/bin/pip3", line 9, in &lt;module&gt;
 from pip import main
ImportError: cannot import name 'main'
</code></pre>

 

<pre><code>guru@guru-notebook:~$ cat `which pip3`
#!/usr/bin/python3
# GENERATED BY DEBIAN

import sys

# Run the main entry point, similarly to how setuptools does it, but because
# we didn't install the actual entry point from setup.py, don't use the
# pkg_resources API.
from pip import main
if __name__ == '__main__':
 sys.exit(main())
</code></pre>

It was working fine earlier, I am not sure why it is throwing this error.
I have searched about this error, but can't find anything to fix it.

Please let me know if you need any further detail, I will update my question.

Error after upgrading pip: cannot import name 'main'

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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每当我尝试使用pip安装任何软件包时，我都会收到这个导入错误：guru@guru-notebook:~$ pip3 install numpyTraceback (most recent call last): File "/usr/bin/pip3", line 9, in <module> from pip...

问升级pip后出错:无法导入名称'main‘
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问升级pip后出错:无法导入名称'main‘EN