How can I install packages using pip according to the requirements.txt file from a local directory?

This works for everyone:

pip install -r /path/to/requirements.txt

Explanation:

-r, –requirement < filename >

Install from the given requirements file. This option can be used multiple times.

For virtualenv to install all files in the requirements.txt file.

1. cd to the directory where requirements.txt is located
2. activate your virtualenv
3. run: pip install -r requirements.txt in your shell

Often, you will want a fast install from local archives, without probing PyPI.

First, download the archives that fulfill your requirements:

$ pip install --download <DIR> -r requirements.txt

Then, install using –find-links and –no-index:

$ pip install --no-index --find-links=[file://]<DIR> -r requirements.txt

I had a similar problem. I tried this:

    pip install -U -r requirements.txt

(-U = update if it had already installed)

But the problem continued. I realized that some of generic libraries for development were missed.

    sudo apt-get install libtiff5-dev libjpeg8-dev zlib1g-dev liblcms2-dev libwebp-dev tcl8.6-dev tk8.6-dev python-tk

I don’t know if this would help you.

Use:

pip install -r requirements.txt

For further details, please check the help option:

pip install --help

We can find the option ‘-r’ –

-r, –requirement Install from the given requirements file. This option can be
used multiple times.

Further information on some commonly used pip install options (this is the help option on the pip install command):

Also the above is the complete set of options. Please use pip install --help for the complete list of options.

I work with a lot of systems that have been mucked by developers "following directions they found on the Internet". It is extremely common that your pip and your python are not looking at the same paths/site-packages. For this reason, when I encounter oddness I start by doing this:

$ python -c 'import sys; print(sys.path)'
['', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-x86_64-linux-gnu',
'/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old',
'/usr/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/dist-packages',
'/usr/lib/python2.7/dist-packages']

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

That is a happy system.

Below is an unhappy system. (Or at least it’s a blissfully ignorant system that causes others to be unhappy.)

$ pip --version
pip 9.0.1 from /usr/local/lib/python3.6/site-packages (python 3.6)

$ python -c 'import sys; print(sys.path)'
['', '/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python27.zip',
'/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7',
'/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin',
'/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac',
'/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages',
'/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk',
'/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old',
'/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload',
'/usr/local/lib/python2.7/site-packages']

$ which pip pip2 pip3
/usr/local/bin/pip
/usr/local/bin/pip3

It is unhappy because pip is (python3.6 and) using /usr/local/lib/python3.6/site-packages while python is (python2.7 and) using /usr/local/lib/python2.7/site-packages

When I want to make sure I’m installing requirements to the right python, I do this:

$ which -a python python2 python3
/usr/local/bin/python
/usr/bin/python
/usr/local/bin/python2
/usr/local/bin/python3

$ /usr/bin/python -m pip install -r requirements.txt

You’ve heard, "If it ain’t broke, don’t try to fix it." The DevOps version of that is, "If you didn’t break it and you can work around it, don’t try to fix it."

Installing requirements.txt file inside virtual env with Python 3:

I had the same issue. I was trying to install the requirements.txt file inside a virtual environment. I found the solution.

Initially, I created my virtualenv in this way:

virtualenv -p python3 myenv

Activate the environment using:

source myenv/bin/activate

Now I installed the requirements.txt file using:

pip3 install -r requirements.txt

Installation was successful and I was able to import the modules.

Short answer

pip install -r /path/to/requirements.txt

or in another form:

python -m pip install -r /path/to/requirements.txt

Explanation

Here, -r is short form of --requirement and it asks the pip to install from the given requirements file.

pip will start installation only after checking the availability of all listed items in the requirements file and it won’t start installation even if one requirement is unavailable.

One workaround to install the available packages is installing listed packages one by one. Use the following command for that. A red color warning will be shown to notify you about the unavailable packages.

cat requirements.txt | xargs -n 1 pip install

To ignore comments (lines starting with a #) and blank lines, use:

cat requirements.txt | cut -f1 -d"#" | sed '/^s*$/d' | xargs -n 1 pip install

Try this:

python -m pip install -r requirements.txt

pip install --user -r requirements.txt 

OR

pip3 install --user -r requirements.txt 

First of all, create a virtual environment.

In Python 3.6

virtualenv --python=/usr/bin/python3.6 <path/to/new/virtualenv/>

In Python 2.7

virtualenv --python=/usr/bin/python2.7 <path/to/new/virtualenv/>

Then activate the environment and install all the packages available in the requirement.txt file.

source <path/to/new/virtualenv>/bin/activate
pip install -r <path/to/requirement.txt>

I have solved with running the below command:

py -m pip install ./requirements.txt

the above command will install all dependencies and libraries for the Django project.

• Create virtual environment python3 -m venv virtual-env (For windows use python instead of python3)
• Activate your virtual environment source virtual-env/bin/activate
• Now install requirements pip install -r requirements.txt

Use pip3 install -r requirements.txt But make sure the requirements.txt file has been pulled from origin and not added to .gitignore

In Windows, this can lead to less format-related path issues, if you have

c:foldersubfolderrequirements.txt

cd c:foldersubfolder 
pip install -r requirements.txt

While pip install -r requirements.txt works most of the time,
we sometimes face the problem that our requirements have conflicting dependencies.

You can install the packages line-by-line with the following one-liner:

while read -r line; do echo $line | cut -d' ' -f1 | xargs pip install; done < requirements.txt

Hope it helps someone!

On windows Using this

pip install -r /path/to/requirements.txt 

On linux pc we have python2 and also python3 so most time pip is regarded as

Python2

pip install -r /path/to/requirements.txt 

Python 3

pip3 install -r /path/to/requirements.txt

Inside your project directory terminal write this:

$ pip freeze > requirements.txt