How to use requirements.txt to install all dependencies in a python project

I am new to python. Recently I got a project written by python and it requires some installation. I run below command to install but got an error.

# pip install requirements.txt Collecting requirements.txt Could not find a version that satisfies the requirement requirements.txt (from versions: ) No matching distribution found for requirements.txt 

I searched on google and found this link but I don't quite understand what the solution in that post.

Below is my requirements.txt file:

# cat requirements.txt ordereddict==1.1 argparse==1.2.1 python-dateutil==2.2 matplotlib==1.3.1 nose==1.3.0 numpy==1.8.0 pymongo==3.3.0 psutil>=2.0 

Is there a easy way to install all required dependencies in this python project?

EDIT1

Below is the output from pip3 install -r requirements.txt.

# pip3 install -r requirements.txt Requirement already satisfied: ordereddict==1.1 in /usr/local/lib/python3.5/dist-packages (from -r requirements.txt (line 1)) Collecting argparse==1.2.1 (from -r requirements.txt (line 2)) Using cached argparse-1.2.1.tar.gz Collecting python-dateutil==2.2 (from -r requirements.txt (line 3)) Using cached python-dateutil-2.2.tar.gz Collecting matplotlib==1.3.1 (from -r requirements.txt (line 4)) Using cached matplotlib-1.3.1.tar.gz Complete output from command python setup.py egg_info: ============================================================================ Edit setup.cfg to change the build options BUILDING MATPLOTLIB matplotlib: yes [1.3.1] python: yes [3.5.2 (default, Nov 17 2016, 17:05:23) [GCC 5.4.0 20160609]] platform: yes [linux] REQUIRED DEPENDENCIES AND EXTENSIONS numpy: yes [version 1.11.3] dateutil: yes [using dateutil version 2.6.0] tornado: yes [tornado was not found. It is required for the WebAgg backend. pip/easy_install may attempt to install it after matplotlib.] pyparsing: yes [using pyparsing version 2.1.10] pycxx: yes [Official versions of PyCXX are not compatible with Python 3.x. Using local copy] libagg: yes [pkg-config information for 'libagg' could not be found. Using local copy.] freetype: no [The C/C++ header for freetype2 (ft2build.h) could not be found. You may need to install the development package.] png: yes [pkg-config information for 'libpng' could not be found. Using unknown version.] OPTIONAL SUBPACKAGES sample_data: yes [installing] toolkits: yes [installing] tests: yes [using nose version 1.3.7] OPTIONAL BACKEND EXTENSIONS macosx: no [Mac OS-X only] qt4agg: no [PyQt4 not found] gtk3agg: no [gtk3agg backend does not work on Python 3] gtk3cairo: no [Requires cairo to be installed.] gtkagg: no [Requires pygtk] tkagg: no [TKAgg requires Tkinter.] wxagg: no [requires wxPython] gtk: no [Requires pygtk] agg: yes [installing] cairo: no [cairo not found] windowing: no [Microsoft Windows only] OPTIONAL LATEX DEPENDENCIES dvipng: no ghostscript: no latex: no pdftops: no ============================================================================ * The following required packages can not be built: * freetype ---------------------------------------- Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-don4ne_2/matplotlib/ 

I have already installed libfreetype6-dev but the pip command still reports missing this dependency.

# apt-get install libfreetype6-dev Reading package lists... Done Building dependency tree Reading state information... Done libfreetype6-dev is already the newest version (2.6.1-0.1ubuntu2). 0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded. 

7 Answers

If you are using Linux OS:

1. Remove matplotlib==1.3.1 from requirements.txt
2. Try to install with sudo apt-get install python-matplotlib
3. Run pip install -r requirements.txt (Python 2), or pip3 install -r requirements.txt (Python 3)
4. pip freeze > requirements.txt

If you are using Windows OS:

1. python -m pip install -U pip setuptools
2. python -m pip install matplotlib

pip install -r requirements.txt for python 2.x

pip3 install -r requirements.txt for python 3.x (in case multiple versions are installed)

python -m pip install -r requirements.txt 

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

(Taken from my comment)

pip won't handle system level dependencies. You'll have to apt-get install libfreetype6-dev before continuing. (It even says so right in your output. Try skimming over it for such errors next time, usually build outputs are very detailed)

Python 3:

pip3 install -r requirements.txt 

Python 2:

pip install -r requirements.txt 

To get all the dependencies for the virtual environment or for the whole system:

pip freeze 

To push all the dependencies to the requirements.txt (Linux):

pip freeze > requirements.txt 

If you want to install all the dependencies inside the requirements file, like npm install on a Node.js project

in python you run the following command:

pip3 install -r ./requirements.txt 

you can use pip or pip3 both work

If you are using Linux as your OS then you can follow the below-mentioned steps:-

Firstly, remove matplotlib==1.3.1 from requirements.txt

After that try to install it with

sudo apt-get install python-matplotlib 

Run pip install -r requirements.txt (Python 2)
or pip3 install -r requirements.txt (Python 3)

pip freeze > requirements.txt 

If you are using Windows as your OS then use the following steps:

python -m pip install -U pip setuptools python -m pip install matplotlib 

check out this install all dependencies in a python project page.