What's the difference between pip and pip3?

[magic]

Pip is for python version less than 3.
and pip3 is used when you want to install packages for python version 3 or higher.
Is this correct?

[Gribouillis]

Yes it is true on systems such as linux which have python 2 and python 3 installed, but you can invoke pip through the python interpreter by using the syntax python -m pip. For example you can install lxml with the command

Output:
python -m pip install lxml

instead of pip install lxml. If 'python' is the command for python 2, this installs lxml for python 2. If 'python3' is the command for python 3, you can use

Output:
python3 -m pip install lxml

in order to install it for python 3.

[magic]

Yes it is true on systems such as linux which have python 2 and python 3 installed, but you can invoke pip through the python interpreter by using the syntax python -m pip. For example you can install lxml with the command

Output:
python -m pip install lxml

instead of pip install lxml. If 'python' is the command for python 2, this installs lxml for python 2. If 'python3' is the command for python 3, you can use

Output:
python3 -m pip install lxml

in order to install it for python 3.

Thank you.

what's the difference in this examle?

python3 -m pip install virtualenv

and

pip install virtualenv

Are they the same thing?

[gruntfutuk]

Thank you.

what's the difference in this examle?

python3 -m pip install virtualenv

and

pip install virtualenv

Are they the same thing?

IF python3 is your only python and python3 and python can both start it, then there is no difference. If python starts legacy python and python3 starts, well, python 3 then pip will install for legacy python and pip3 or your python3 example will install for python 3.

[snippsat]

Test with pip -V or pip2 -V | pip3 -V
It's so simple that if pip3 point to Python 3,then pip3 will install to Python 3.
Linux Mint 19:

tom@tom-VirtualBox:~$ pip2 -V
pip 9.0.1 from /usr/lib/python2.7/dist-packages (python 2.7)

tom@tom-VirtualBox:~$ pip3 -V
pip 18.0 from /home/tom/.local/lib/python3.6/site-packages/pip (python 3.6)

# Install to Python 2
tom@tom-VirtualBox:~$ pip2 install lxml

# Install to Python 3
tom@tom-VirtualBox:~$ pip3 install --user lxml
Collecting lxm
.... lxml-4.2.5-cp36-cp36m-manylinux1_x86_64.whl
Installing collected packages: lxml
Successfully installed lxml-4.2.5

# Test that it work:
tom@tom-VirtualBox:~$ python3
Python 3.6.5 (default, Apr  1 2018, 05:46:30) 
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from lxml import etree
>>> etree.__version__
'4.2.5'

For Windows:
Python 3.6/3.7 and pip installation under Windows
Here do pip pip3 and pip3.7 all point to main version in Path.
All other version install can be run/install to with py command.

C:\>pip -V
pip 18.0 from c:\python37\lib\site-packages\pip (python 3.7)

C:\>pip3 -V
pip 18.0 from c:\python37\lib\site-packages\pip (python 3.7)

C:\>pip3.7 -V
pip 18.0 from c:\python37\lib\site-packages\pip (python 3.7)

# Other versions use py
C:\                                                                                                            
λ py -3.6 -V                                                                                                   
Python 3.6.4                                                        
                                                      
C:\                                                                                                            
λ py -2.7 -V                                                                                                   
Python 2.7.9                                                                                                   
                                                                                                                
C:\                                                                                                            
λ # Using pip to install to 2.7                                                                            
λ py -2.7 -m pip install logzero                                                                               
Requirement already satisfied: logzero in c:\python27\lib\site-packages

[magic]

Test with pip -V or pip2 -V | pip3 -V
It's so simple that if pip3 point to Python 3,then pip3 will install to Python 3.
Linux Mint 19:

tom@tom-VirtualBox:~$ pip2 -V
pip 9.0.1 from /usr/lib/python2.7/dist-packages (python 2.7)

tom@tom-VirtualBox:~$ pip3 -V
pip 18.0 from /home/tom/.local/lib/python3.6/site-packages/pip (python 3.6)

# Install to Python 2
tom@tom-VirtualBox:~$ pip2 install lxml

# Install to Python 3
tom@tom-VirtualBox:~$ pip3 install --user lxml
Collecting lxm
.... lxml-4.2.5-cp36-cp36m-manylinux1_x86_64.whl
Installing collected packages: lxml
Successfully installed lxml-4.2.5

# Test that it work:
tom@tom-VirtualBox:~$ python3
Python 3.6.5 (default, Apr  1 2018, 05:46:30) 
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from lxml import etree
>>> etree.__version__
'4.2.5'

For Windows:
Python 3.6/3.7 and pip installation under Windows
Here do pip pip3 and pip3.7 all point to main version in Path.
All other version install can be run/install to with py command.

C:\>pip -V
pip 18.0 from c:\python37\lib\site-packages\pip (python 3.7)

C:\>pip3 -V
pip 18.0 from c:\python37\lib\site-packages\pip (python 3.7)

C:\>pip3.7 -V
pip 18.0 from c:\python37\lib\site-packages\pip (python 3.7)

# Other versions use py
C:\                                                                                                            
λ py -3.6 -V                                                                                                   
Python 3.6.4                                                        
                                                      
C:\                                                                                                            
λ py -2.7 -V                                                                                                   
Python 2.7.9                                                                                                   
                                                                                                                
C:\                                                                                                            
λ # Using pip to install to 2.7                                                                            
λ py -2.7 -m pip install logzero                                                                               
Requirement already satisfied: logzero in c:\python27\lib\site-packages

Thank you.