[Python] Capture snapshot of current python environment and recreate on another machine

I have an environment created using miniconda with python 3.6.8, called basepy_3_6_8.

I want to save the environment snapshot to a file and then recreate it later on another machine:

There are different commands to capture the environment snapshot, with slightly different outputs. Which of these can I use to guarantee that the exact environment used by the user is recreated in the target?

I was hoping pip freeze > requirements.txt and pip install -r requirements.txt would work independent of the source environment, but I noticed that pip freeze from within a conda environment does not capture the python version.

Here is the code to create the conda environment, and output of different commands:

$ conda create -n myenv python=3.6.8
$ conda activate myenv

(myenv)$ pip freeze
astroid==2.1.0
autopep8==1.4.3
certifi==2018.11.29
colorama==0.4.1
isort==4.3.4
lazy-object-proxy==1.3.1
mccabe==0.6.1
pycodestyle==2.4.0
pylint==2.2.2
six==1.12.0
typed-ast==1.1.1
wincertstore==0.2
wrapt==1.11.0

(myenv)$ pip list
Package Version
----------------- ----------
astroid 2.1.0
autopep8 1.4.3
certifi 2018.11.29
colorama 0.4.1
isort 4.3.4
lazy-object-proxy 1.3.1
mccabe 0.6.1
pip 18.1
pycodestyle 2.4.0
pylint 2.2.2
setuptools 40.6.3
six 1.12.0
typed-ast 1.1.1
wheel 0.32.3
wincertstore 0.2
wrapt 1.11.0

(myenv)$ conda list
# packages in environment at C:\Users\alias\AppData\Local\Continuum\miniconda3\envs\myenv:
#
# Name Version Build Channel
certifi 2018.11.29 py36_0
pip 18.1 py36_0
python 3.6.8 h9f7ef89_0
setuptools 40.6.3 py36_0
sqlite 3.26.0 he774522_0
vc 14.1 h0510ff6_4
vs2015_runtime 14.15.26706 h3a45250_0
wheel 0.32.3 py36_0
wincertstore 0.2 py36h7fe50ca_0

(myenv)$ conda list --export
# This file may be used to create an environment using:
# $ conda create --name <env> --file <this file>
# platform: win-64
certifi=2018.11.29=py36_0
pip=18.1=py36_0
python=3.6.8=h9f7ef89_0
setuptools=40.6.3=py36_0
sqlite=3.26.0=he774522_0
vc=14.1=h0510ff6_4
vs2015_runtime=14.15.26706=h3a45250_0
wheel=0.32.3=py36_0
wincertstore=0.2=py36h7fe50ca_0


I am eventually interested in a general tool that can capture the current environment of a specified type (conda, virtualenv, venv, global python environment) so as to install it uniformly on another machine. What is the best approach for this?

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