python-env role: Add a task that permits to install specific versions of pip packages.

python-env/tasks/main.yml

@@ -12,20 +12,6 @@
       apt: name={{ item }} state={{ py_env_pkgs_state }}  update_cache=yes cache_valid_time=600
       with_items: '{{ py_pip_deps | default([]) }}'
 
-    - name: Fix the ssl warnings installing some ssl libraries
-      pip: name={{ item }}
-      with_items: '{{ py_env_pip_fix_ssl_warnings | default ([]) }}'
-      when:
-        - not py_env_trusty_workaround
-        - is_trusty
-
-    - name: Install a list of pip packages
-      pip: name={{ item }}
-      with_items: '{{ py_env_pip_pkgs | default ([]) }}'
-      when:
-        - not py_env_trusty_workaround
-        - is_trusty
-
   when: py_env_install
   tags: [ "python", "py_env" ]
 
@@ -51,6 +37,13 @@
     - name: Install setuptools version 33.1.1
       pip: name=setuptools version=33.1.1 state=present
 
+  when:
+    - py_env_trusty_workaround
+    - py_env_install
+    - is_trusty
+  tags: [ "python", "py_env" ]
+
+- block:
     - name: Fix the ssl warnings installing some ssl libraries
       pip: name={{ item }}
       with_items: '{{ py_env_pip_fix_ssl_warnings | default ([]) }}'
@@ -59,8 +52,9 @@
       pip: name={{ item }}
       with_items: '{{ py_env_pip_pkgs | default ([]) }}'
 
-  when:
-    - py_env_trusty_workaround
-    - py_env_install
-    - is_trusty
-  tags: [ "python", "py_env" ]
+    - name: Install a list of versioned pip packages
+      pip: name={{ item.pkg }} version={{ item.version }}
+      with_items: '{{ py_env_versioned_pip_pkgs | default ([]) }}'
+
+  when: py_env_install
+  tags: [ "python", "py_env", "py_env_pkgs" ]