I have Python installed in Windows and used pip to install lots of things.
How can I know what packages I installed with pip?
pip list will list all your installed packages.
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Hey everyone I installed Python3.9 on my Mac using homebrew package manager but now I do not know how to install packages to it for use
Can anyone please tell me, thanks !
You should first do some research on the Python virtual environment, but the final answer to your question is to use pip install for installing Python packages. Be aware that there are other options out there, but pip is the most prevalent.
When you installed python, it has pip installed by default. pip comes with python. You can check pip version by
pip --version
OR
pip3 --version
Now, in order to install any other package, you can install by
pip install <package-name>
It would be better if you install a virtual environment, and install all other packages inside the virtual environment so that you can install packages according to your project requirements and with different versions.
To install virtual environment, do
pip install virtualenv
Once the virtual environment is installed, you can create your virtualenv according to your project requirement by:
virtualenv -p python3 venv
Here venv is your virtualenv name. To activate it,
source venv/bin/actiavte
Now, you can install all your required packages inside this virtualenv by pip3 install <package-name>. This will keep it separated from your system environment.
When I use 'pip' to install packages, even if the package has already been installed, it will continue to install, instead of showing the prompt of 'Requirements already satisfied'.
But when I try to install with 'sudo pip', this prompt will come up and the package will not be installed.
I am not using any virtual environment, but the pip that comes with the ubuntu system. So how does pip check installed packages and how to fix this problem?
Thanks in advance.
I was informed that if I have installed anaconda to organize python then I would better install using:
conda install mypackage
rather than
pip3 install mypackage
Is that true? if that is true, can anyone tell some reason for that? version inconsistent or hard to maintain?
You can install your packages with both conda and pip, all of them would work well. The only difference is that conda is Anaconda's package manager, while pip is Python package manager, so there could be some version incompabilities between the packages, installed from different packages into one virtual environment.
Actually there are some difference here:
conda install will install package in your venv environment when you are install under some environment.which may be some thing like: d:/.../venv
while
pip install will install package in some system folder, in my computer is like c:/users/.../
you can definitely change the order of the path in your sys.path to decide which version of package you can use, if you have more than one version installed(if you install numpy
using both conda install and pip install then you may get two versions in two different folders)
There may be some way to put the installed package from pip also in venv folder, I am trying to find it.
If I uninstall pip with
pip uninstall pip
does it remove all installed packages too?
No. pip is a tool that handles downloading packages and installing them to various locations; those locations are not part of pip's own install directories. As such, removing pip has no effect on installed packages.
(Common paths for installing packages include /usr/lib/<pythonversion> or /usr/local/lib/<pythonversion>.)
I have a server with CentOS installed on it. Python 2.6.6 was installed on it. I installed python 3.4.2 and 2.7.8. Now when i use command like :
pip install virtualenvwrapper
it's stop with error and error is for using different packages. How can i remove other packages and have just python 3.4.2?
Sorry for my terrible English.
If you want to uninstall a package through pip, you can try
pip uninstall <package>
More details can be found here