Code Fragment mode in Pycharm 3 debugging returns None always

Question

When in debug mode in Pycharm, the Evaluate Expression -> Code Fragment tool doesn't seem to be able to assign and display a variable in one go. The only case that seems to be evaluated correctly is when the first line is a constant value.

eg.

10

results as expected in

result = {int} 10

but when trying to obtain the same result with:

c = 10
c

the output is

result = {NoneType} None

However, if I hover over each variable in fragment window, the values are shown as a popup.

Answer 1

Edits to sum up the comments (thanks Vaibhav Mishra):

Unfortunately, this seems to be the default behavior: (won't fix bug)

My understanding of this feature:

Although Pycharm will display a None result when evaluating multiple lines, they are all executed in the context of the currently selected stack frame. One of the consequences being the update of the namespace. Subsequently using single-line evaluations in the same context (or mouse hover) will display the expected values.

Two potential usages:

1. The Evaluate Code Fragment dialog is automatically prompted when evaluating multiple lines from the editor: Select a block | Evaluate Expression (Alt+F8). May be useful to tweak a couple of lines and run evaluation in one go.
2. As an alternative to the Debug Command Line, the code fragment mode supports loops and if/else. Although the inspection seems a bit tipsy (mistakenly unresolved variables), it can be ignored, and the editing assistance provided there can be put to good use.