method 2 may not contain only the python base package, but only specify the version of python in the current environment.

if you need to install the specified package, you can use a .txt document to declare separately the address of the Anaconda source package you want to download, such as saving it in "environment.txt", and then install it using the following command line:

  Conda create how to create a pure Python 3.6 environment  this answer. The explanation is very clear.