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20 hours ago •
lmaurits
lmaurits
Changes to border line styes [was: Requests for enhancement]
Hi, this is a request for an enhancement. I would like to be able to print
these two kind of tables, but as far as I understand this is currently not
possible with prettytable:
header1 header2 header3
===========================
x1y1 x2y1 x3y1
x1y2 x2y2 x3y2
x1y3 x2y3 x3y3
i.e. only an hrule under the header (possibly, updating the character used)
And also the following syntax is quite common:
+----------------------------+
| header1 header2 header3 |
+============================+
| x1y1 x2y1 x3y1 |
| x1y2 x2y2 x3y2 |
| x1y3 x2y3 x3y3 |
+----------------------------+
i.e. a frame around the table, and a different horizontal rule under the header.
Original issue reported on code.google.com by [email protected] on 19 Jan 2013 at 9:40
Hi, thanks for this suggestion.
I have made changes to the SVN trunk such that it is now partially possible to
get the styles you want.
The "hrules" attribute, which could previously take values FRAME, ALL or NONE
can now also be set to HEADER, which prints a hrule only under the header, like
your first example.
In addition to the old "hrules" attribute, there is now also "vrules", which
can be take values FRAME, ALL or NONE.
By setting hrules=HEADER and vrules=NONE, along with horizontal_character="="
and junction_character="=", it should be possible to achieve the first example
table you gave.
By setting hrules=FRAME and vrules=FRAME, you can get something close to your
second example, the only difference being that you still won't have - as the
horizontal character for the frame and = as the horizontal character for the
header.
I may add the option for two different kind of horizontal characters, or I may
not, I am not sure yet. It seems harmless enough, but if I do that, then
somebody will want the ability to, e.g, make a table like this:
+=====+=====+
| Foo . Bar |
+-----+-----+
| 1 . 2 |
+=====+=====+
i.e. where the external rules are different from the internal rules, and then
if I do that somebody will want something else, and before you know it instead
of just horizontal_char, vertical_char and junction_char there will have to be
12 different attributes controlling the way lines are drawn to cover all the
edge cases...
In general I am not opposed to putting in stuff to let people tweak their
tables in all the little ways they want, but only if that doesn't make it
difficult for the majority of people to do simple things. If someone just
wants to use, say, "=" as their horizontal line everywhere, they should be able
to do that by setting one attribute, and should not be forced to set 3 or 4
attributes corresponding to all the different kinds of horizontal line if they
don't care about the differences.
Original comment by [email protected] on 22 Jan 2013 at 12:43
- Changed state: Accepted
- Added labels: Type-Enhancement
- Removed labels: Type-Defect
First of all, thank you very much.
About the way prettytable works, I think that you should distinguish among:
* header line
* frame border
* horizontal rules
* vertical rules
I personally thing that controlling independently if these components of the
table should be showed or not is more important than using '&' for the
horizontal lines, which would produce a ugly table, plain and simple :).
I also think that if vrules==FRAME, then the code should not use the standard
junction_char but use the horizontal_char instead. The following code, for
example:
import prettytable as pt
p = pt.PrettyTable()
p.add_row(range(4))
p.add_row(range(5,9))
p.hrules=pt.ALL
p.vrules=pt.FRAME
print p
should produce the following result:
+---------------------------------------+
| Field 1 Field 2 Field 3 Field 4 |
+---------------------------------------+
| 0 1 2 3 |
+---------------------------------------+
| 5 6 7 8 |
+---------------------------------------+
instead of
+---------+---------+---------+---------+
| Field 1 Field 2 Field 3 Field 4 |
+---------+---------+---------+---------+
| 0 1 2 3 |
+---------+---------+---------+---------+
| 5 6 7 8 |
+---------+---------+---------+---------+
Original comment by [email protected] on 22 Jan 2013 at 8:26
Attachments:
Original comment by [email protected] on 18 Feb 2013 at 7:12
- Changed title: Changes to border line styes [was: Requests for enhancement]
I've made changes in trunk which fix the issue with printing spurious junction
characters as part of the horizontal lines when vrules is set to FRAME. Thanks
for pointing out this shortcoming.
Original comment by [email protected] on 19 Feb 2013 at 5:38