Add some needed defaults to the python3 role.

library/roles/python3-env/defaults/main.yml

@@ -3,6 +3,7 @@ py3_env_install: False
 py3_ppa: 'ppa:deadsnakes/ppa'
 py3_env_version: 3.6
 py3_env_pkgs_state: present
+py3_pip_pkgs_state: present
 py3_env_site: False
 
 py3_env_basic_pkgs:
@@ -12,3 +13,7 @@ py3_env_dpkg:
   - 'python{{ py3_env_version }}'
   - 'python{{ py3_env_version }}-venv'
   - 'python{{ py3_env_version }}-dev'
+
+py3_env_pip_pkgs: []
+py3_env_versioned_pip_pkgs: []
+

library/roles/python3-env/tasks/main.yml

@@ -16,7 +16,7 @@
     shell: python{{ py3_env_version }} -m ensurepip && pip{{ py3_env_version }} install --upgrade pip setuptools wheel
 
   - name: Install a list of pip packages
-    pip: executable=pip{{ py3_env_version }} name={{ py3_env_pip_pkgs }} state=latest
+    pip: executable=pip{{ py3_env_version }} name={{ py3_env_pip_pkgs }} state={{ py3_pip_pkgs_state }}
 
   - name: Install a list of versioned pip packages
     pip: executable=pip{{ py3_env_version }} name={{ item.pkg }} version={{ item.version }}