Merge pull request #1276 from ktalik/patch-2

Make the indentation instructions more clear

en/python_introduction/README.md

@@ -683,7 +683,7 @@ if 3 > 2:
     print('It works!')
 ```
 
-Notice how we've indented the next line of code by 4 spaces? We need to do this so Python knows what code to run if the result is true. You can do one space, but nearly all Python programmers do 4 to make things look neat. A single `tab` will also count as 4 spaces.
+Notice how we've indented the next line of code by 4 spaces? We need to do this so Python knows what code to run if the result is true. You can do one space, but nearly all Python programmers do 4 to make things look neat. A single Tab will also count as 4 spaces as long as your text editor is set to do so. When you made your choice, don't change it! If you already indented with 4 spaces, make any future indentation with 4 spaces, too - otherwise you may run into problems.
 
 Save it and give it another run: