Update PIP & Download jupyter Lab

Problem 1

In the installation jupyter notebook At the end of ,python Kindly remind me : Your pip It's time to update , A new version is available ：

WARNING: You are using pip version 20.2.4; however, version 20.3.1 is available.
You should consider upgrading via the 'f:\python38\python.exe -m pip install --upgrade pip' command.

therefore , I used this command ：pip install --upgrade pip, Then came the following sentence ：

C:\Users\Asus>pip install --upgrade pip
Collecting pip
  Downloading pip-20.3.1-py2.py3-none-any.whl (1.5 MB)
     |████████████████████████████████| 1.5 MB 163 kB/s
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 20.2.4
    Uninstalling pip-20.2.4:
ERROR: Could not install packages due to an EnvironmentError: [WinError 5]  Access denied .: 'f:\\python38\\scripts\\pip.exe'
Consider using the `--user` option or check the permissions.

Then I tried pip, Just tell me. :

ModuleNotFoundError: No module named 'pip'

Because above uninstall 了 pip After that, he immediately reported a mistake , So it doesn't have a new version installed pip, So the current status is not pip 了 … The new one didn't make it , Instead, they unloaded the old ones …

Solution 1

Several times tossing , The following sequence is available on my computer ：

1. python -m ensurepip
2. python -m pip install --upgrade pip

The first instruction will install a lower version pip, The second instruction is to update pip 了 , So update later pip Just use the second command .

Problem 2

Use the following command to install jupyter lab

pip install jupyter lab

Start with the following command jupyter lab

jupyter lab

Report the following error ：

Jupyter command `jupyter-lab` not found

Solution 2

because ( link )

Its the space. Its always the space. 
Never ever use spaces within package name. Its always either namepart1-namepart2 or namepart1namepart2. This is because arguments are separated by space. 
So if you put space in between, it makes pip think that you want to install two different packages named jupyter and lab. 
Just use:

python -m pip install jupyterlab

The reason is that you use spaces , Mistakenly installed jupyter and lab These two bags …
resolvent ：

# 1.  If it was installed by mistake jupyter  and  lab, Please execute the following order , Otherwise, go directly to the second step ：
pip uninstall jupyter lab  # Delete both packages at the same time 

# 2. Install
python -m pip install jupyterlab
# or
pip install jupyterlab

# 3. start
jupyter lab
# or 
jupyter-lab