On 08/06/2015 03:21 AM, Rustom Mody wrote:
On Thursday, August 6, 2015 at 6:36:56 AM UTC+5:30, Terry Reedy wrote:
There have been discussions, such as today on Idle-sig , about who uses
Idle and who we should design it for. If you use Idle in any way, or
know of or teach classes using Idle, please answer as many of the
questions below as you are willing, and as are appropriate
Private answers are welcome. They will be deleted as soon as they are
tallied (without names).
I realized that this list is a biased sample of the universe of people
who have studied Python at least, say, a month. But biased data should
be better than my current vague impressions.
0. Classes where Idle is used:
Where?
Level?
Idle users:
1. Are you
grade school (1=12)?
undergraduate (Freshman-Senior)?
post-graduate (from whatever)?
2. Are you
beginner (1st class, maybe 2nd depending on intensity of first)?
post-beginner?
3. With respect to programming, are you
amateur (unpaid)
professional (paid for programming)
--
Terry Jan Reedy, Idle maintainer
I used idle to teach a 2nd year engineering course last sem
It was a more pleasant experience than I expected
One feature that would help teachers:
It would be nice to (have setting to) auto-save the interaction window
[Yeah I tried to see if I could do it by hand but could not find where]
Useful for giving as handouts of the class
So students rest easy and dont need to take 'literal' notes of the session
I will now be teaching more advanced students and switching back to emacs
-- python, C, and others -- so really no option to emacs.
Not ideal at all but nothing else remotely comparable
I've been using Idle full time to simultaneously manage my financial
holdings, develop the management system and manually fix errors. While
the ultimate goal is a push-button system, I have not reached that stage
and am compelled to work trial-and-error style. For this way of working
I found Idle well-suited, since the majority of jobs I do are hacks and
quick fixes, not production runs running reliably.
I recently came up with a data transformation framework that greatly
expedites interactive development. It is based on transformer objects
that wrap a transformation function. The base class Transformer handles
the flow of the data in a manner that allows linking the transformer
modules together in chains. With a toolbox of often used standards, a
great variety of transformation tasks can be accomplished by simply
lining up a bunch of toolbox transformers in chains. Bridging a gap now
and then is a relatively simple matter of writing a transformation
function that converts the output format upstream of the gap to the
required input format downstream of the gap.
The system works very well. It saves me a lot of time. I am currently
writing a manual with the intention to upload it for comment and also to
upload the system, if the comments are not too discouraging. If I may
show a few examples below . . .
Frederic (moderately knowledgeable non-professional)
------------------------------------------------------
>>> import TYX
>>> FR = TYX.File_Reader ()
>>> CSVP = TYX.CSV_Parser ()
>>> TAB = TYX.Tabulator ()
>>> print TAB (CSVP (FR ('Downloads/xyz.csv'))) # Calls nest
-------------------------------------------
Date,Open,Close,High,Low,Volume
07/18/2014,34.36,34.25,34.36,34.25,485
07/17/2014,34.55,34.50,34.55,34.47,"2,415"
07/16/2014,34.65,34.63,34.68,34.52,"83,477"
-------------------------------------------
>>> CSVP.get () # display all parameters
CSV_Parser
dialect > None
delimiter > '\t'
quote > '"'
has_header > False
strip_fields > True
headers > []
>>> CSVP.set (delimiter = ',')
>>> TAB.set (table_format = 'pipe')
>>> print TAB (CSVP ()) # Transformers retain their input
|:-----------|:------|:------|:------|:------|:-------|
| Date | Open | Close | High | Low | Volume |
| 07/18/2014 | 34.36 | 34.25 | 34.36 | 34.25 | 485 |
| 07/17/2014 | 34.55 | 34.50 | 34.55 | 34.47 | 2,415 |
| 07/16/2014 | 34.65 | 34.63 | 34.68 | 34.52 | 83,477 |
>>> class formatter (TYX.Transformer):
def __init__ (self):
TYX.Transformer.__init__ (self, symbol = None) # declare
parameter
def transform (self, records):
symbol = self.get ('symbol')
if symbol:
out = []
for d, o, c, h, l, v in records [1:]: # Clip headers
month, day, year = d.split ('/')
d = '%s-%s-%s' % (year, month, day)
v = v.replace (',', '')
out.append ((d, symbol, o, c, h, l, v))
return out
>>> fo = formatter ()
>>> fo.set (symbol = 'XYZ')
>>> TAB.set (float_format = 'f')
>>> print TAB (fo (CSVP())) # Transformers also retain their output
|:-----------|:----|----------:|----------:|----------:|----------:|------:|
| 2014-07-18 | XYZ | 34.360000 | 34.250000 | 34.360000 | 34.250000
| 485 |
| 2014-07-17 | XYZ | 34.550000 | 34.500000 | 34.550000 | 34.470000
| 2415 |
| 2014-07-16 | XYZ | 34.650000 | 34.630000 | 34.680000 | 34.520000 |
83477 |
>>> DBW = TYX.MySQL_Writer (DB, USER, PASSWORD, table_name = 'quotes')
>>> DBW (fo ())
0
0 means it worked
>>> Q2DB = Chain (FR, CSVP, fo, DBW)
>>> TL = TYX.Text_To_Lines ()
>>> SR = TYX.System_Read ()
>>> for file_name in TL (SR ('ls -1 ~/Downloads/*.csv')):
symbol = file_name.rsplit ('/', 1)[1].split ('.')[0].upper ()
print symbol
Q2DB.set (symbol = symbol, file_name = file_name)
Q2DB ()
ABC
0
DEF
0
. . .
End of hacking. The production Transformer is next.
>>> class Quotes_CSV_To_DB (TYX.Chain):
def __init__ (self):
TYX.Chain.__init__ (
self,
TYX.File_Reader (),
TYX.CSV_Parser (delimiter = ','),
formatter (),
TYX.MySQL_Writer (DB, USER, PASSWORD, table_name =
'quotes')
)
>>> Q2DB = Quotes_CSV_To_DB ()
>>> for file_name in TL (SR ('ls -1 ~/Downloads/*.csv')):
. . .
>>> Q2DB.get () # display all parameters
==============================================
Q2DB
symbol = 'QQQ'
file_name = '/home/fr/Downloads/qqq.csv'
==============================================
File_Reader
file_name > '/home/fr/Downloads/qqq.csv'
----------------------------------------------
CSV_Parser
dialect > None
delimiter > ','
headers > []
quote > '"'
strip_fields > True
has_header > False
----------------------------------------------
formatter
symbol > QQQ
----------------------------------------------
MySQL_Writer
db_name > 'fr'
table_name > 'quotes'
user > 'fr'
permit > 2
password > None
----------------------------------------------
==============================================
--
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