Let Python Shell do the indentation correctly.

edit

Indentation means the space from margin to the begin of characters in a line. Python language is a very sensitive language for indentation, it has caused confusion for many beginners. Putting in an extra space or leaving one out where it is needed will surely generate an error message . Some common causes of this error include:

• Forgetting to indent the statements within a compound statement.
• Forgetting to indent the statements of a user-defined function.

The error message IndentationError: expected an indented block would seem to indicate that you have an indentation error. It is probably caused by a mix of tabs and spaces .

This seems to work for me. I may be confused due to the messed up formatting your comment had due to the slightly braindead options in this forum. I tried to fix that by editing it; I thought at first maybe 'print(i)' was not indented but it seemed to be. If it were not indented, this is not really something we can fix since moving relative indents within a pasted block has cases where there's ambiguity. However, we do re-indent pasted blocks of code in the shells so it removes any leading indent before all the lines. The bottom line is we may need further clarification on this one.