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IDLE inserts an extra blank line after the prompt after encountering a SyntaxError:
```
>>> 1 + 2
3
>>> print('Hello')
Hello
 v-- Missing single quote!
>>> d = {1: 'uno', 2: 'dos', 3: 'tres}
	 
SyntaxError: EOL while scanning string literal
>>> print('Hello')
	 <-- Extra blank line and whitespace (tab and space).
Hello
>>> 1 + 2
	 <-- Extra blank line and whitespace (tab and space).
3
>>> 
```
Notice the line starting with ">>> d =" above contains a missing single quote which causes a "SyntaxError: EOL while scanning string literal". This causes IDLE to insert extra blank lines with one tab and one space after every input.
The old behavior looked like:
```
>>> 1 + 2
3
>>> print('Hello')
Hello
>>> d = {1: 'uno', 2: 'dos', 3: 'tres}
 
SyntaxError: EOL while scanning string literal
>>> print('Hello')
Hello
>>> 1 + 2
3
```