[IPython-User] Pretty print as default print function

Gökhan Sever

at Nov 10, 2012 at 1:10 am

Thanks for the reply Thomas.

I still use Python 2.7, along with all of the scientific Python stack.

Do you think is there a simple way to modify IPython's "run" command so
that output's pretty printed just like IPython shell?

On Fri, Nov 9, 2012 at 2:28 AM, Thomas Kluyver wrote:

In python 3, you can replace the builtin print function. I don't know of
any way to modify the behaviour of print statements in python 2.

Thomas

On Nov 9, 2012 6:59 AM, "Gökhan Sever" wrote:

Hello,

I would like to be able print NumPy arrays matching the IDL's array print
outout. For instance:

IDL> print, findgen(5)
0.00000 1.00000 2.00000 3.00000 4.00000
IDL> print, dindgen(5)
0.0000000 1.0000000 2.0000000 3.0000000
4.0000000
0.0000000 1.0000000 2.0000000 3.0000000
4.0000000

I1 np.arange(5, dtype='float64')
O1 0.0000000 1.0000000 2.0000000 3.0000000
4.0000000

I2 np.arange(5, dtype='float32')
O2 0.00000 1.00000 2.00000 3.00000 4.00000

Ignoring O1 and O2 lines, outputs (formatting) are matching. I achieved
this by defining some custom pprint formatters in the IPy config file.

However, this is only valid within IPython while just typing array names.
For instance, running these lines revert the printing settings back to
normal.

Is there a way to make this type of customized printing default for
executing a file via Python? ie., can we replace python's print statement
with pprint?

If not, should I edit numpy/core/arrayprint.py and use a pythonrc file to
achieve the effect?

I am also interested in custom printing other data types than nd.arrays.

Thanks.

--
Gökhan

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

--
Gökhan

reply | permalink

Thomas Kluyver

at Nov 10, 2012 at 8:18 am

⇧

The only thing I can think of is to hack an ast transformation into %run,
to turn print statements into calls to a function you've defined.

The good news is that a lot of scientific python packages now support
python 3.

Thanks,
Thomas

On Nov 10, 2012 1:10 AM, "Gökhan Sever" wrote:

Thanks for the reply Thomas.

I still use Python 2.7, along with all of the scientific Python stack.

Do you think is there a simple way to modify IPython's "run" command so
that output's pretty printed just like IPython shell?

On Fri, Nov 9, 2012 at 2:28 AM, Thomas Kluyver wrote:

In python 3, you can replace the builtin print function. I don't know of
any way to modify the behaviour of print statements in python 2.

Thomas

On Nov 9, 2012 6:59 AM, "Gökhan Sever" wrote:

Hello,

I would like to be able print NumPy arrays matching the IDL's array
print outout. For instance:

IDL> print, findgen(5)
0.00000 1.00000 2.00000 3.00000 4.00000
IDL> print, dindgen(5)
0.0000000 1.0000000 2.0000000 3.0000000
4.0000000
0.0000000 1.0000000 2.0000000 3.0000000
4.0000000

I1 np.arange(5, dtype='float64')
O1 0.0000000 1.0000000 2.0000000 3.0000000
4.0000000

I2 np.arange(5, dtype='float32')
O2 0.00000 1.00000 2.00000 3.00000 4.00000

Ignoring O1 and O2 lines, outputs (formatting) are matching. I achieved
this by defining some custom pprint formatters in the IPy config file.

However, this is only valid within IPython while just typing array
names. For instance, running these lines revert the printing settings back
to normal.

Is there a way to make this type of customized printing default for
executing a file via Python? ie., can we replace python's print statement
with pprint?

If not, should I edit numpy/core/arrayprint.py and use a pythonrc file
to achieve the effect?

I am also interested in custom printing other data types than nd.arrays.

Thanks.

--
Gökhan

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

--
Gökhan

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

reply | permalink

Carl Smith

at Nov 10, 2012 at 8:39 am

⇧

Just to be clear, you'd then do `sys.stdout = StandardOut()` and be
careful not to recur by writing out within the write method. Again,
I'm not sure this makes sense, but surely you want to modify stdout on
it's way to the notebook, not overload print.

On 10 November 2012 08:34, Carl Smith wrote:
Can you not redirect stdout to a method with something like...

class StandardOut(object):

def __init__(self): pass

def write(self, string):
do_stuff()

I'm not sure if that'll work. Just thinking out loud really.

On 10 November 2012 08:17, Thomas Kluyver wrote:
The only thing I can think of is to hack an ast transformation into %run, to
turn print statements into calls to a function you've defined.

The good news is that a lot of scientific python packages now support python
3.

Thanks,
Thomas

On Nov 10, 2012 1:10 AM, "Gökhan Sever" wrote:

Thanks for the reply Thomas.

I still use Python 2.7, along with all of the scientific Python stack.

Do you think is there a simple way to modify IPython's "run" command so
that output's pretty printed just like IPython shell?

On Fri, Nov 9, 2012 at 2:28 AM, Thomas Kluyver wrote:

In python 3, you can replace the builtin print function. I don't know of
any way to modify the behaviour of print statements in python 2.

Thomas

On Nov 9, 2012 6:59 AM, "Gökhan Sever" wrote:

Hello,

I would like to be able print NumPy arrays matching the IDL's array
print outout. For instance:

IDL> print, findgen(5)
0.00000 1.00000 2.00000 3.00000 4.00000
IDL> print, dindgen(5)
0.0000000 1.0000000 2.0000000 3.0000000
4.0000000
0.0000000 1.0000000 2.0000000 3.0000000
4.0000000

I1 np.arange(5, dtype='float64')
O1 0.0000000 1.0000000 2.0000000 3.0000000
4.0000000

I2 np.arange(5, dtype='float32')
O2 0.00000 1.00000 2.00000 3.00000 4.00000

Ignoring O1 and O2 lines, outputs (formatting) are matching. I achieved
this by defining some custom pprint formatters in the IPy config file.

However, this is only valid within IPython while just typing array
names. For instance, running these lines revert the printing settings back
to normal.

Is there a way to make this type of customized printing default for
executing a file via Python? ie., can we replace python's print statement
with pprint?

If not, should I edit numpy/core/arrayprint.py and use a pythonrc file
to achieve the effect?

I am also interested in custom printing other data types than nd.arrays.

Thanks.

--
Gökhan

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

--
Gökhan

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

reply | permalink

Gökhan Sever

at Nov 16, 2012 at 3:25 am

⇧

Hi Carl,

Can you provide a simple working example here?

Thanks.

On Sat, Nov 10, 2012 at 1:34 AM, Carl Smith wrote:

Can you not redirect stdout to a method with something like...

class StandardOut(object):

def __init__(self): pass

def write(self, string):
do_stuff()

I'm not sure if that'll work. Just thinking out loud really.

On 10 November 2012 08:17, Thomas Kluyver wrote:
The only thing I can think of is to hack an ast transformation into %run, to
turn print statements into calls to a function you've defined.

The good news is that a lot of scientific python packages now support python
3.

Thanks,
Thomas

On Nov 10, 2012 1:10 AM, "Gökhan Sever" wrote:

Thanks for the reply Thomas.

I still use Python 2.7, along with all of the scientific Python stack.

Do you think is there a simple way to modify IPython's "run" command so
that output's pretty printed just like IPython shell?

On Fri, Nov 9, 2012 at 2:28 AM, Thomas Kluyver wrote:

In python 3, you can replace the builtin print function. I don't know

of

any way to modify the behaviour of print statements in python 2.

Thomas

On Nov 9, 2012 6:59 AM, "Gökhan Sever" wrote:

Hello,

I would like to be able print NumPy arrays matching the IDL's array
print outout. For instance:

IDL> print, findgen(5)
0.00000 1.00000 2.00000 3.00000 4.00000
IDL> print, dindgen(5)
0.0000000 1.0000000 2.0000000 3.0000000
4.0000000
0.0000000 1.0000000 2.0000000 3.0000000
4.0000000

I1 np.arange(5, dtype='float64')
O1 0.0000000 1.0000000 2.0000000 3.0000000
4.0000000

I2 np.arange(5, dtype='float32')
O2 0.00000 1.00000 2.00000 3.00000 4.00000

Ignoring O1 and O2 lines, outputs (formatting) are matching. I

achieved

this by defining some custom pprint formatters in the IPy config file.

However, this is only valid within IPython while just typing array
names. For instance, running these lines revert the printing settings

back

to normal.

Is there a way to make this type of customized printing default for
executing a file via Python? ie., can we replace python's print

statement

with pprint?

If not, should I edit numpy/core/arrayprint.py and use a pythonrc file
to achieve the effect?

I am also interested in custom printing other data types than

nd.arrays.

Thanks.

--
Gökhan

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

--
Gökhan

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

--
Gökhan

reply | permalink

Gökhan Sever

at Nov 16, 2012 at 3:28 am

⇧

Hi,

This works fine for a single array printing, but I want to be able to
execute a script and have arrays printed in this form.

I think, its best to wait for Python 3 adaption, or adapt my scripts to Py3
in order to achieve this with the least amount of extra coding :)

On Sat, Nov 10, 2012 at 1:42 AM, Aaron Meurer wrote:

Why not just use the regular IPython display hook, and not use print,
i.e., just call the object like

In [1]: findgen(5)
Out[1]: 0.00000 1.00000 2.00000 3.00000 4.00000

If you insist on using print, one option would be to just monkey-patch
array.__str__.

Aaron Meurer

On Sat, Nov 10, 2012 at 1:34 AM, Carl Smith wrote:

Can you not redirect stdout to a method with something like...

class StandardOut(object):

def __init__(self): pass

def write(self, string):
do_stuff()

I'm not sure if that'll work. Just thinking out loud really.

On 10 November 2012 08:17, Thomas Kluyver wrote:
The only thing I can think of is to hack an ast transformation into %run, to
turn print statements into calls to a function you've defined.

The good news is that a lot of scientific python packages now support python
3.

Thanks,
Thomas

On Nov 10, 2012 1:10 AM, "Gökhan Sever" wrote:

Thanks for the reply Thomas.

I still use Python 2.7, along with all of the scientific Python stack.

Do you think is there a simple way to modify IPython's "run" command so
that output's pretty printed just like IPython shell?

On Fri, Nov 9, 2012 at 2:28 AM, Thomas Kluyver <tak...@...com>

wrote:

In python 3, you can replace the builtin print function. I don't know

of

any way to modify the behaviour of print statements in python 2.

Thomas

On Nov 9, 2012 6:59 AM, "Gökhan Sever" wrote:

Hello,

I would like to be able print NumPy arrays matching the IDL's array
print outout. For instance:

IDL> print, findgen(5)
0.00000 1.00000 2.00000 3.00000 4.00000
IDL> print, dindgen(5)
0.0000000 1.0000000 2.0000000 3.0000000
4.0000000
0.0000000 1.0000000 2.0000000 3.0000000
4.0000000

I1 np.arange(5, dtype='float64')
O1 0.0000000 1.0000000 2.0000000 3.0000000
4.0000000

I2 np.arange(5, dtype='float32')
O2 0.00000 1.00000 2.00000 3.00000 4.00000

Ignoring O1 and O2 lines, outputs (formatting) are matching. I

achieved

this by defining some custom pprint formatters in the IPy config

file.

However, this is only valid within IPython while just typing array
names. For instance, running these lines revert the printing

settings back

to normal.

Is there a way to make this type of customized printing default for
executing a file via Python? ie., can we replace python's print

statement

with pprint?

If not, should I edit numpy/core/arrayprint.py and use a pythonrc

file

to achieve the effect?

I am also interested in custom printing other data types than

nd.arrays.

Thanks.

--
Gökhan

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

--
Gökhan

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

--
Gökhan

reply | permalink

Aaron Meurer

at Nov 17, 2012 at 7:56 am

⇧

So just write a custom pprint() function (or call it whatever you want),
and call it instead of print.

Aaron Meurer

On Thu, Nov 15, 2012 at 8:28 PM, Gökhan Sever wrote:

Hi,

This works fine for a single array printing, but I want to be able to
execute a script and have arrays printed in this form.

I think, its best to wait for Python 3 adaption, or adapt my scripts to
Py3 in order to achieve this with the least amount of extra coding :)

On Sat, Nov 10, 2012 at 1:42 AM, Aaron Meurer wrote:

Why not just use the regular IPython display hook, and not use print,
i.e., just call the object like

In [1]: findgen(5)
Out[1]: 0.00000 1.00000 2.00000 3.00000 4.00000

If you insist on using print, one option would be to just monkey-patch
array.__str__.

Aaron Meurer

On Sat, Nov 10, 2012 at 1:34 AM, Carl Smith wrote:

Can you not redirect stdout to a method with something like...

class StandardOut(object):

def __init__(self): pass

def write(self, string):
do_stuff()

I'm not sure if that'll work. Just thinking out loud really.

On 10 November 2012 08:17, Thomas Kluyver wrote:
The only thing I can think of is to hack an ast transformation into %run, to
turn print statements into calls to a function you've defined.

The good news is that a lot of scientific python packages now support python
3.

Thanks,
Thomas

On Nov 10, 2012 1:10 AM, "Gökhan Sever" wrote:

Thanks for the reply Thomas.

I still use Python 2.7, along with all of the scientific Python stack.

Do you think is there a simple way to modify IPython's "run" command

so

that output's pretty printed just like IPython shell?

On Fri, Nov 9, 2012 at 2:28 AM, Thomas Kluyver <tak...@...com>

wrote:

In python 3, you can replace the builtin print function. I don't

know of

any way to modify the behaviour of print statements in python 2.

Thomas

On Nov 9, 2012 6:59 AM, "Gökhan Sever" <gok...@...com>

wrote:

Hello,

I would like to be able print NumPy arrays matching the IDL's array
print outout. For instance:

IDL> print, findgen(5)
0.00000 1.00000 2.00000 3.00000 4.00000
IDL> print, dindgen(5)
0.0000000 1.0000000 2.0000000 3.0000000
4.0000000
0.0000000 1.0000000 2.0000000 3.0000000
4.0000000

I1 np.arange(5, dtype='float64')
O1 0.0000000 1.0000000 2.0000000 3.0000000
4.0000000

I2 np.arange(5, dtype='float32')
O2 0.00000 1.00000 2.00000 3.00000 4.00000

Ignoring O1 and O2 lines, outputs (formatting) are matching. I

achieved

this by defining some custom pprint formatters in the IPy config

file.

However, this is only valid within IPython while just typing array
names. For instance, running these lines revert the printing

settings back

to normal.

Is there a way to make this type of customized printing default for
executing a file via Python? ie., can we replace python's print

statement

with pprint?

If not, should I edit numpy/core/arrayprint.py and use a pythonrc

file

to achieve the effect?

I am also interested in custom printing other data types than

nd.arrays.

Thanks.

--
Gökhan

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

--
Gökhan

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

--
Gökhan

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

reply | permalink

Gökhan Sever

at Nov 17, 2012 at 7:52 pm

⇧

Yes, this is the solution that I will follow as long as I continue with
Python 2.x series.

Thanks.

On Sat, Nov 17, 2012 at 12:55 AM, Aaron Meurer wrote:

So just write a custom pprint() function (or call it whatever you want),
and call it instead of print.

Aaron Meurer

On Thu, Nov 15, 2012 at 8:28 PM, Gökhan Sever wrote:

Hi,

This works fine for a single array printing, but I want to be able to
execute a script and have arrays printed in this form.

I think, its best to wait for Python 3 adaption, or adapt my scripts to
Py3 in order to achieve this with the least amount of extra coding :)

On Sat, Nov 10, 2012 at 1:42 AM, Aaron Meurer wrote:

Why not just use the regular IPython display hook, and not use print,
i.e., just call the object like

In [1]: findgen(5)
Out[1]: 0.00000 1.00000 2.00000 3.00000 4.00000

If you insist on using print, one option would be to just monkey-patch
array.__str__.

Aaron Meurer

On Sat, Nov 10, 2012 at 1:34 AM, Carl Smith wrote:

Can you not redirect stdout to a method with something like...

class StandardOut(object):

def __init__(self): pass

def write(self, string):
do_stuff()

I'm not sure if that'll work. Just thinking out loud really.

On 10 November 2012 08:17, Thomas Kluyver wrote:
The only thing I can think of is to hack an ast transformation into %run, to
turn print statements into calls to a function you've defined.

The good news is that a lot of scientific python packages now support python
3.

Thanks,
Thomas

On Nov 10, 2012 1:10 AM, "Gökhan Sever" <gok...@...com>

wrote:

Thanks for the reply Thomas.

I still use Python 2.7, along with all of the scientific Python

stack.

Do you think is there a simple way to modify IPython's "run" command

so

that output's pretty printed just like IPython shell?

On Fri, Nov 9, 2012 at 2:28 AM, Thomas Kluyver <tak...@...com>

wrote:

In python 3, you can replace the builtin print function. I don't

know of

any way to modify the behaviour of print statements in python 2.

Thomas

On Nov 9, 2012 6:59 AM, "Gökhan Sever" <gok...@...com>

wrote:

Hello,

I would like to be able print NumPy arrays matching the IDL's array
print outout. For instance:

IDL> print, findgen(5)
0.00000 1.00000 2.00000 3.00000 4.00000
IDL> print, dindgen(5)
0.0000000 1.0000000 2.0000000 3.0000000
4.0000000
0.0000000 1.0000000 2.0000000 3.0000000
4.0000000

I1 np.arange(5, dtype='float64')
O1 0.0000000 1.0000000 2.0000000 3.0000000
4.0000000

I2 np.arange(5, dtype='float32')
O2 0.00000 1.00000 2.00000 3.00000

4.00000

Ignoring O1 and O2 lines, outputs (formatting) are matching. I

achieved

this by defining some custom pprint formatters in the IPy config

file.

However, this is only valid within IPython while just typing array
names. For instance, running these lines revert the printing

settings back

to normal.

Is there a way to make this type of customized printing default for
executing a file via Python? ie., can we replace python's print

statement

with pprint?

If not, should I edit numpy/core/arrayprint.py and use a pythonrc

file

to achieve the effect?

I am also interested in custom printing other data types than

nd.arrays.

Thanks.

--
Gökhan

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

--
Gökhan

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

--
Gökhan

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

--
Gökhan

reply | permalink

Robert Kern

at Nov 16, 2012 at 11:27 am

⇧

On 2012-11-16 10:53 AM, Thomas Kluyver wrote:
On 10 November 2012 08:34, Carl Smith wrote:

Can you not redirect stdout to a method with something like...

class StandardOut(object):

def __init__(self): pass

def write(self, string):
do_stuff()

I'm not sure if that'll work. Just thinking out loud really.

I don't think this (overriding sys.stdout) will work for what Gökhan is trying
to do. Unlike displayhook(), which gets an object, sys.stdout.write() only gets
the string form, so you can't easily produce a different representation.

For a Python class, you could monkeypatch __str__() to produce your preferred
representation, but ndarray is defined in compiled code, so that's not an option.

The array formatting code is pure Python and monkeypatchable:

https://github.com/numpy/numpy/blob/master/numpy/core/arrayprint.py

--
Robert Kern

_______________________________________________
IPython-User mailing list
ipy...@...org
http://mail.scipy.org/mailman/listinfo/ipython-user

reply | permalink

Carl Smith

at Nov 16, 2012 at 11:29 am

⇧

I think Thomas is right.

I'm not sure what option remains, beyond preprocessing scripts and swapping
out print statements, which sounds like a world of pain. Or migrating to
Python3.

reply | permalink

group	ipython-user
posted	Nov 9, '12 at 6:59a
active	Nov 17, '12 at 7:52p
posts	10
users	5

responses	expanded	Hotkey: s
font	variable	Hotkey: f
user style	avatars	Hotkey: a

[IPython-User] Pretty print as default print function

Search Discussions

9 responses

Related Discussions

5 users in discussion

Content

People

Support

Translate