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

Question

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 http   stackoverflow com questions 28167987 python-pip-trouble-installing-from-requirements-txt 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 gt  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

User · Answer

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  gt  requirements txt

User · Answer

python -m pip install -r requirements txt   Referece  How to install packages using pip according to the requirements txt file from a local directory

User · Answer

If you are using Linux OS    Remove matplotlib  1 3 1 from requirements txt Try to install 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  gt  requirements txt   If you are using Windows OS    python -m pip install -U pip setuptools python -m pip install matplotlib

User · Answer

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

User · Answer

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

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