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|  | IDE for Python | | |
| | | server |  |
|  Posted: Fri May 16, 2008 6:08 pm Post subject: IDE for Python |  |
| |
| | | Joshua Kugler | |
| | Posted: Fri May 16, 2008 6:08 pm Post subject: Re: IDE for Python | |
Jonathan Barbero wrote:
| Quote: | I´m newbie with Python and to learn it better I want to use a good IDE to
concentrate on Python power. There is any IDE like Eclipse for Java for
Python? If not, what is the best Python´s IDE for you?
|
This is an EFAQ (extremely frequently asked question).
LINK
j |
| |
| | | Arnaud Delobelle | |
| | Posted: Fri May 16, 2008 7:02 pm Post subject: Re: namespaces and eval | |
| |  | |
dave.g1234@gmail.com writes:
| Quote: | Sorry for the repost, didnt' quite finish
Suppose I have a function in module X that calls eval e.g,
X.py
_______
Def foo(bar):
Eval(bar)
_______
Now eval will be called using the default eval(bar,globals(),locals())
and globals will pull in anything in module X.
Now I have module Y that calls bar like so
Y.py
________
from x import *
def biz():
print "Im a silly example!"
Foo("biz()")
_______
Python will complain that it cannot find biz because it's not the X
module.
My question - is there any way to a) get a listing of active namespaes
search ALL active namespaces for a particular variable
|
sys.modules gives you all the live modules.
| Quote: | b) get the namespace of the caller withing passing it in (here, Y)
|
sys._getframe(1).f_globals (resp. sys._getframe(1).f_locals) gives you
the caller's globals (resp. locals).
| Quote: | c) do anything else to get biz without passing
foo("biz()",locals(),globals()) or hacking biz into the __builtin__
namespace(don't know if it's even possible, but it defeats the
purpose of what I'm trying to do) ?
|
Functions in Python are objects like any other, and can be passed as
parameters. I.e:
x.py
----------
def foo(bar):
bar()
| Quote: | from x import foo
def biz(): print "Boo!"
foo(biz)
Boo!
|
| Quote: | I realize this is here for a reason, but I'm working on something
that's kind of a hack already
Thanks
dave
More gratuitous context. Long story I'm trying to write a hack for a
concise way of adding arbitrary methods to objects for JPA/JQuery like
chaning eg.
def foo(self):
print "foo"
return self;
wrap(x).foo().foo().foo().foo() etc....
|
What about a composition function instead? I.e.
compose(foo, foo, foo, foo)(x)
Here's one that I made earlier:
LINK
[snip]
--
Arnaud |
| |
| | | Hans Nowak | |
| | Posted: Fri May 16, 2008 7:28 pm Post subject: Re: can't delete from a dictionary in a loop | |
Dan Upton wrote:
| Quote: | for pid in procs_dict:
if procs_dict[pid].poll() != None
# do the counter updates
del procs_dict[pid]
The problem:
RuntimeError: dictionary changed size during iteration
|
I don't know if the setup with the pids in a dictionary is the best way to
manage a pool of processes... I'll leave it others, presumably more
knowledgable, to comment on that.  But I can tell you how to solve the
immediate problem:
for pid in procs_dict.keys():
...
Hope this helps!
--Hans |
| |
| | | Jan Claeys | |
| | Posted: Fri May 16, 2008 8:03 pm Post subject: Re: downloading a link with javascript in it.. | |
Op Mon, 12 May 2008 22:06:28 +0200, schreef Diez B. Roggisch:
| Quote: | There is no way to interpret the JS in Python,
|
There is at least one way:
<http://wwwsearch.sourceforge.net/python-spidermonkey/>
--
JanC |
| |
| | | Eduardo O. Padoan | |
| | Posted: Fri May 16, 2008 8:38 pm Post subject: Re: can't delete from a dictionary in a loop | |
| | | |
On Fri, May 16, 2008 at 6:40 PM, Gary Herron <gherron@islandtraining.com> wrote:
| Quote: | bruno.desthuilliers@gmail.com wrote:
On 16 mai, 23:28, Hans Nowak <zephyrfalcon!NO_SP...@gmail.com> wrote:
Dan Upton wrote:
for pid in procs_dict:
if procs_dict[pid].poll() != None
# do the counter updates
del procs_dict[pid]
The problem:
RuntimeError: dictionary changed size during iteration
I don't know if the setup with the pids in a dictionary is the best way
to
manage a pool of processes... I'll leave it others, presumably more
knowledgable, to comment on that. But I can tell you how to solve
the
immediate problem:
for pid in procs_dict.keys():
No, keys() produces a list (which is what is wanted here).
It's iterkeys() that produces an iterator which would reproduce the OP's
problem.
And then, in Python3, keys() produces something else altogether (call a view
of the dictionary) which would provoke the same problem, so yet another
solution would have to be found then.
|
In Python 3.0, list(procs_dict.keys()) would have the same effect.
| Quote: | Gary Herron
I'm afraid this will do the same exact thing. A for loop on a dict
iterates over the dict keys, so both statements are strictly
equivalent from a practical POV.
--
LINK
--
LINK
|
--
Eduardo de Oliveira Padoan
LINK
LINK
Bookmarks: LINK |
| |
| | | Lie | |
| | Posted: Fri May 16, 2008 8:56 pm Post subject: Re: Scanning through Windows registry... | |
| | | |
On May 17, 2:06 am, Lie <Lie.1...@gmail.com> wrote:
| Quote: | On May 9, 7:36 pm, Unknown Hero <unknown_hero...@hotmail.com> wrote:> Ah, never mind, got it to work. Here's the code now. I hope I won't
run into another problems later :D
code snippet
#Goes through all keys and subkeys in the selected hive (defined as
root) and replaces the value 'old' with the value 'new'
#
#IMPORTANT! You should always back up the registry before attempting
to modify it.
#The author of this script CANNOT BE HELD RESPONSIVE for any damage
caused by running this script.
(snip)
One thing though, the disclaimer should not said the author cannot be
held responsive, or you would be Windows that is not responsive all
the times. I think it should say "responsible".
I'm quite confused though, the code could be made simpler by dozens
using Python's high-level functionalities. Particularly the lengthy
code that checked whether the string contained a substring and replace
the substring with new could be done easily (and faster) using
python's in and replace function. I'll post the code later when I
finished checking places where the codes could be simplified, and I'll
also polish the entry code and a few other things (and pythonify the
code according to the PEP 8's guide lines).
|
The tidied code ++
'''
Goes through all keys and subkeys in the selected hive (defined
as root) and replaces the value 'old' with the value 'new'
IMPORTANT! You should always back up the registry before
attempting to modify it. The author of this script CANNOT BE
HELD RESPONSIBLE for any damage caused by running this script.
You can call the script from a command line and pass two or
three values: HIVE, OLD, and NEW.
OLD and NEW can be any string value
HIVE has to be one of the following:
HKEY_LOCAL_MACHINE / HKLM
HKEY_CURRENT_USER / HKCU
HKEY_CLASSES_ROOT / HKCR
HKEY_USERS / HKU
HKEY_CURRENT_CONFIG / HKCC
If NEW is not specified, values that matches OLD will be replaced
with empty string (i.e. deleted)
'''
import _winreg
import sys
HIVES = {
"HKEY_LOCAL_MACHINE" : _winreg.HKEY_LOCAL_MACHINE,
"HKEY_CURRENT_USER" : _winreg.HKEY_CURRENT_USER,
"HKEY_CLASSES_ROOT" : _winreg.HKEY_CLASSES_ROOT,
"HKEY_USERS" : _winreg.HKEY_USERS,
"HKEY_CURRENT_CONFIG" : _winreg.HKEY_CURRENT_CONFIG,
}
AccessError = False
class RegKey(object):
def __init__ (self, name, key):
self.name = name
self.key = key
def __str__ (self):
return self.name
def walk(top):
""" Walk through each key, subkey, and values
Walk the registry starting from the key top
in the form HIVE\\key\\subkey\\..\\subkey and generating
key, subkey_names, values at each level.
key is a lightly wrapped registry key, including the name
and the HKEY object.
subkey_names are simply names of the subkeys of that key
values are 3-tuples containing (name, data, data-type).
See the documentation for _winreg.EnumValue for more details.
"""
try:
if "\\" not in top:
top += "\\"
root, subkey = top.split ("\\", 1)
key = _winreg.OpenKey(HIVES[root],
subkey,
0,
_winreg.KEY_READ |
_winreg.KEY_SET_VALUE)
subkeys = []
i = 0
while True:
try:
subkeys.append(_winreg.EnumKey(key, i))
i += 1
except EnvironmentError:
break
values = []
i = 0
while True:
try:
values.append(_winreg.EnumValue(key, i))
i += 1
except EnvironmentError:
break
yield RegKey(top, key), subkeys, values
for subkey in subkeys:
for result in walk(top + "\\" + subkey):
yield result
except WindowsError:
global AccessError
AccessError = True
def main(start, startHandle, old, new):
basickeys = []
i = 0
while True:
try:
basickeys.append(_winreg.EnumKey(startHandle, i))
i += 1
except EnvironmentError:
break
for x in basickeys:
for key, subkey_names, values in walk(start + "\\" + x):
for (name, data, type) in values:
if type == _winreg.REG_SZ:
if old in data:
winreg.SetValueEx(key.key,
name,
0,
type,
data.replace(old, new))
print key.key, name, 0, type,
data.replace(old, new)
def help():
#Show help
print '''
USAGE: Registry.py HIVE OLD [NEW]
HIVE: The root key in registry you want to go through.
HKEY_CLASSES_ROOT / HKCR
HKEY_CURRENT_USER / HKCU
HKEY_LOCAL_MACHINE / HKLM
HKEY_USERS / HKU
HKEY_CURRENT_CONFIG / HKCC
OLD: The value to search for.
Wrap multiword strings with "".
NEW: The value which will replace OLD.
Wrap multiword strings with "".
If not supplied, it default to empty string
which means delete all occurence of OLD
in the registry.
'''
if __name__ == '__main__':
if len(sys.argv) < 3 or len(sys.argv) > 4:
print 'Invalid Number of Arguments'
help()
exit()
## Root Hive
try:
start = {
'HKCU' : 'HKEY_CURRENT_USER',
'HKLM' : 'HKEY_LOCAL_MACHINE',
'HKCR' : 'HKEY_CLASSES_ROOT',
'HKU' : 'HKEY_USERS',
'HKCC' : 'HKEY_CURRENT_CONFIG',
}[sys.argv[1].upper()]
except KeyError:
start = sys.argv[1].upper()
try:
startHandle = {
'HKEY_CURRENT_USER' : _winreg.HKEY_CURRENT_USER,
'HKEY_LOCAL_MACHINE' : _winreg.HKEY_LOCAL_MACHINE,
'HKEY_CLASSES_ROOT' : _winreg.HKEY_CLASSES_ROOT,
'HKEY_USERS' : _winreg.HKEY_USERS,
'HKEY_CURRENT_CONFIG' : _winreg.HKEY_CURRENT_CONFIG,
}[start]
except KeyError:
print >> sys.stderr, 'Invalid Hive'
help()
exit()
## The substring to be replaced
old = sys.argv[2]
## The replacement string
try:
new = sys.argv[3]
except:
new = ''
main(start, startHandle, old, new)
if AccessError:
print '''
Some keys cannot be changed because you don't have the appropriate
permission to modify those keys, please try again with a suitable
user account.
''' |
| |
| | | bruno.desthuilliers@gmail | |
| | Posted: Fri May 16, 2008 9:08 pm Post subject: Re: namespaces and eval | |
| | | |
On 16 mai, 20:44, dave.g1...@gmail.com wrote:
| Quote: | Suppose I have a function in module X that calls eval e.g,
X.py
_______
Def foo(bar):
Eval(bar)
_______
Now eval will be called using the default eval(bar,globals(),locals())
and globals will pull in anything in module X.
Now I have module Y that calls bar like so
Y.py
________
from x import *
def biz():
print "Im a silly example!"
Foo("biz()")
_______
Python will complain that it cannot find biz because it's not the X
module.
|
I'm afraid you're using the wrong tool here. Just try this:
# module x
def foo(bar):
bar()
# module y
from x import foo
def baaz():
print "in y.baaz"
foo(baaz)
Remember that in Python, everything (at least, everything you can bind
to a nme) is an object, including functions, classes and modules. And
that every name lives in a namespace, that can be inspected somehow
(using globals() and locals(), but also using getattr() or some
function from the inspect module). IOW, when you think that eval() (or
exec()) is what you need, odds are there's a way better solution.
FWIW, I must have used exec twice and eval thrice in 7+ years of
Python programming - and believe me, I'm not afraid of wizardry and
black magic. |
| |
| | | jay graves | |
| | Posted: Fri May 16, 2008 9:21 pm Post subject: Re: save dictionary for later use? | |
| | | |
On May 16, 3:24 pm, globalrev <skanem...@yahoo.se> wrote:
| Quote: | On 16 Maj, 21:22, jay graves <jaywgra...@gmail.com> wrote:
On May 16, 2:17 pm, globalrev <skanem...@yahoo.se> wrote:
i extract info from one file and put it into a dictionary.
i want to save that dictionary for later use, how do i do that?
might save a list of dictionaries or a list of classobjects too if
there is any difference.
use the 'pickle' module.http://docs.python.org/lib/module-pickle.html
pickle.dumps(mg)
pickle.load(mg)
'dict' object has no attribute 'readline'
dumps load(well i dont know but i get no complaint but running load
generates that error)
|
It's best to post a minimal set of code that exhibits your error.
You aren't saving the output of pickle.dumps and you are using
pickle.load instead of pickle.loads.
Sample loading to and from a string which you can tuck away in a file.
| Quote: | import pickle
test = {'a':1,'b':2}
picklestr = pickle.dumps(test)
test2 = pickle.loads(picklestr)
test == test2
True
|
Sample using an open file.
| Quote: | import pickle
test = {'a':1,'b':2}
pfile = open('pickletest','wb')
pickle.dump(test,pfile)
pfile.close()
pfile = open('pickletest','rb')
test2 = pickle.load(pfile)
pfile.close()
test == test2
True
|
....
Jay Graves |
| |
| | | Guest | |
| | Posted: Fri May 16, 2008 9:23 pm Post subject: Re: namespaces and eval | |
Thanks for the responses. I'm well aware that the function can be
passed in the parameters, passing in the functino as an arg defeats
the purpose of what I'm going after.
@ Arnaud - Nice. I'm not sure what the performance of mine vs. yours,
but a perfunctory glance looks like we're doing the close to the same
thing. Maybe one advanage to doing it wrap(x).foo().... is that you
can pass in other parameters to foo. Of course, getting the callers
locals/globals is bad in of itself.
best,
dave |
| |
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