Given the python source code directory is it possible to create requirements.txt automatically from the import section

automatically-create-requirements.txt-on-python

$ pip3 freeze > requirements.txt  # Python3
$ pip freeze > requirements.txt  # Python2


# if you want to list only packages used inside a virtualenv use:
$ source <myvenvname>/bin/activate         # or in Windows cd <myenvname>\Scripts\   then type activate.bat  Enter
$ pip freeze -l > requirements.txt 


# install packages using pip according to the requirements.txt file from a local directory
$ pip install -r requirements.txt      # pip install to requirements.txt



# Simple Python Version Management: pyenv
# easily switch between multiple versions of Python (https://github.com/pyenv/pyenv)

# virtual env menggunakan spesifik python version
$ virtualenv -p="C:\Python37\python.exe" "C:\Users\a c e r\Documents\crispdm-agungpambudi-prophet"

# python3:
$ pip3 install virtualenv
$ python3 -m venv <myenvname> 


# python2:
$ pip install virtualenv
$ virtualenv <myenvname>



# "WARNING: Ignoring invalid distribution -raitlets (c:\users\a c e r\documents\crispdm-agungpambudi-prophet\lib\site-packages)"
# solution:
$ cd C:\Users\a c e r\Documents\crispdm-agungpambudi-prophet\Lib\site-packages
$ rm -fr "~raitlets-5.3.0.dist-info"     # delete folder dengan prefix ~



# https://tecadmin.net/install-python-3-7-on-ubuntu-linuxmint/
$ virtualenv -p="/usr/local/bin/python3.7" "/home/user/Github/crispdm-agungpambudi-prop"



$ pip uninstall fbprophet pystan
$ pip --no-cache-dir install pystan==2.17  #any version
$ pip --no-cache-dir install fbprophet==0.2 #any version
$ pip install Cython --force




# menggunakan Anaconda : https://www.digitalocean.com/community/tutorials/how-to-install-the-anaconda-python-distribution-on-ubuntu-18-04

$ conda env list
$ conda deactivate

$ conda env remove -n corrupted_env  # delete the Conda Environment

$ conda search "^python$"   # lihat daftar versi python

# perintah dobawah ini akan menggunakan python versi 3.7.11
$ conda create -n crispdm-agungpambudi-prop python=3.7.11 crispdm-agungpambudi-prop # create a virtual environment for your project
$ source activate crispdm-agungpambudi-prop



# on ubuntu : https://discuss.streamlit.io/t/pystan-issues-while-deploying-an-app-on-share-streamlit-io/23057/3
scipy
seaborn >= 0.11.2
sklearn
pystan == 2.19.1.1
fbprophet == 0.7.1

$ conda activate crispdm-agungpambudi-prop
$ conda install -n crispdm-agungpambudi-prop pip # install additional Python packages to a virtual environment
$ conda install -n crispdm-agungpambudi-prop scikit-learn
$ pip freeze -l > requirements.txt
$ source deactivate # deactivate your virtual environment