Merge pull request #1651 from jrsnzc/master

PATTERNS should be quoted when grep is used in a shell command.

Author: das-g

en/python_installation/instructions.md

@@ -58,7 +58,7 @@ If you have a different version of Python installed, at least 3.4.0 (e.g. 3.6.0)
 
 {% filename %}command-line{% endfilename %}
 ```
-$ grep ^NAME= /etc/os-release
+$ grep '^NAME=' /etc/os-release
 ```
 
 Afterwards, depending on the result, follow one of the following installation guides below this section.