Hi John,
On 2014-01-17, John Cremona <[email protected]> wrote:
>> This works for me as well. The problem only occurs when typing a new
>> definition, not when I go back to an old one.
>>
>
> Agreed. But when in the middle of the new definition you can type an
> up-arrow to chenge previous lines? I can even go back to the first
> line def f(): and then (in effect) start again.
Let's see what happens.
First step: I start to write a definition, hit return, and (of course) I
see this, with the cursor in the fourth position:
sage: def foo(x):
....:
Now, I notice that the function was supposed to be called "bar". If I
just hit the up-arrow, then a line that starts with blank spaces shows
up (result of an earlier cut-and-paste of a doctest)---no surprise,
since the cursor is in position four, hence, up-arrow seeks for the next
line in the history starting with four blank spaces.
Hence, I go back to position 0 and hit the up-arrow again. Ineed, I now
get the previous line---but it is just a *copy* of the previous line.
Thus, this is what I see:
sage: def foo(x):
....: def foo(x):
with the cursor right at the end of the second line.
Now, I replace it by "def bar(x):" and hit return and complete the
definition. But alas, I get an error, since (of course) an indentation
is expected after the first line, that *still* is "def foo(x):":
sage: def foo(x):
....: def bar(x):
....: return x
....:
File "<ipython-input-2-a2509f69cd36>", line 2
def bar(x):
^
IndentationError: expected an indented block
If you want to paste code into IPython, try the %paste and %cpaste magic
functions.
Conclusion: I can *not* go back to the first line. All what I get is a
copy of the first line that is put into the second line. And I still
don't see a way to correct a line after hitting return. That's why
Ctrl-C used to be handy, because it made it possible to return to the
sage prompt, then use the up-arrow, and then edit the *whole* multiline
command, and that's why I think it is a bug that Ctrl-C does not return
to the prompt, in Sage-6.0.
Best regards,
Simon
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