Added a description of the inequality operator.

en/python_introduction/README.md

@@ -319,10 +319,12 @@ A big part of programming includes comparing things. What's the easiest thing to
     True
     >>> 1 == 1
     True
+    >>> 5 != 2
+    True
 
 We gave Python some numbers to compare. As you can see, Python can compare not only numbers, but it can also compare method results. Nice, huh?
 
-Do you wonder why we put two equal signs `==` next to each other to compare if numbers are equal? We use a single `=` for assigning values to variables. You always, __always__ need to put two `==` if you want to check if things are equal to each other.
+Do you wonder why we put two equal signs `==` next to each other to compare if numbers are equal? We use a single `=` for assigning values to variables. You always, __always__ need to put two `==` if you want to check if things are equal to each other. We can also state that things are unequal to each other. For that, we use the symbol `!=`, as shown in the example above.
 
 Give Python two more tasks: