Explanation about for loop
can any one help me explaining for loop and its execution and its syntax with a simple example. -- http://mail.python.org/mailman/listinfo/python-list
Re: How can i eval subindex on list[ ][ ] ?
its working for me i think its better to mention the value of i and j for both lists or you might have done mistake while formatting strings it should be %s for strings and %d for numbers if any subelement in lists does not formatted properly it may lead to error -- http://mail.python.org/mailman/listinfo/python-list
Standard streams
what is standard streams in case of python? -- http://mail.python.org/mailman/listinfo/python-list
Diff between opening files in 'r' and 'r+' mode
i want to know the difference between 'r' mode and 'r+' mode
1.i = open('c:\python25\integer.txt','w')>for writiing
i.write('hai')->written some content in text file
i = open('c:\python25\integer.txt','r')>for reading
print i.read()>for printing the contents in that text file
i = open('c:\python25\integer.txt','w')-->for writing
i.write('how')---?Rewrite the contents
print i.read()
[MY QUESTION]:i want to read the text file contents cant it be done by
giving (print i.read())?
Before going to next question [I deleted all the contents in the text
file]
2.i = open('c:\python25\integer.txt','r+')-For reading and writing
i.write('hai')->written some content to text file
print i.read()->{Ø †('c:\python25\integer.txt','w')
i write('')
print i.read()how')
i = open('c:\python25\integer.txt','r')
print i.read()
i = open('c:\python25\integer.txt','w')
i.write()
i = open('c:\python25\integer.txt','r')
print i.read() } --->Thats what i saw on
interpreter(In curly braces) when i ran the script
[MY QUESTION]:1.from where the above in curly braces is printed?and i
have written only 'hai' to the text file
2.Should i recall again the opening of the
file in 'r' mode to read the file?
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Explanation about pickle module
can any one explain about pickle i read in the book but they have not provided any example for that so please explain with a simple example -- http://mail.python.org/mailman/listinfo/python-list
Reference Counts
Hi All, I am a new user of Python and am having a bit of problem understanding the Reference counting and memory leakage issues. Requesting help from experienced users I wrote the following simple program. #!/usr/bin/python import sys global a print "Total Reference count at the start =",sys.gettotalrefcount() a=1 print "a ref count =",sys.getrefcount(a) b=a print "a ref count =",sys.getrefcount(a) del a del b print "Total Reference count at the end =",sys.gettotalrefcount() I executed it. I am seeing the following. Total Reference count at the start = 16538 a ref count = 49 a ref count = 50 Total Reference count at the end = 16540 [6416 refs] There are a few questions that I am having on this. (1) Why should 'a' reference count be 49 before I even made an assignment ? (2) The Total Reference count at the end has increased by 2 . Why ? Am I leaking memory ? (3) I have read somewhere that an increase in sys.gettotalrefcount() is indicative of a memory leak ? Aint that correct ? Thanks for the help. Bye, raghavan V -- http://mail.python.org/mailman/listinfo/python-list
Re: Reference Counts
Heiko, Thanks for the explanation. I understood the idea of 1 being interned. Also I understood the globals vars having a reference in the internal dict. I ran the "leaky" version of the program and yes...it showed a progressively increasing totalrefcount as below. Before 0 : 16579 After 0 : 16581 Before 1 : 16581 After 1 : 16583 Before 2 : 16583 After 2 : 16585 Before 3 : 16585 After 3 : 16587 Before 4 : 16587 After 4 : 16589 Before 5 : 16589 After 5 : 16591 Before 6 : 16591 After 6 : 16593 Before 7 : 16593 After 7 : 16595 Before 8 : 16595 After 8 : 16597 Before 9 : 16597 After 9 : 16599 Before 10 : 16599 After 10 : 16601 Before 11 : 16601 After 11 : 16603 Before 12 : 16603 After 12 : 16605 Before 13 : 16605 After 13 : 16607 Before 14 : 16607 After 14 : 16609 Before 15 : 16609 However, the 'non-leaky' one showed a funny trend ...it kept increasing the totalrefcount for five iterations (see 1 thru 5) and then dropped down by 5 ( See Before 5 : 16584 After 5 : 16580 ) suddenly and again increase as shown below. However, at the time when the script finsished execution, we were not too far from the starting totalrefcount (16584 from 16579), Before 0 : 16579 After 0 : 16580 Before 1 : 16580 After 1 : 16581 Before 2 : 16581 After 2 : 16582 Before 3 : 16582 After 3 : 16583 Before 4 : 16583 After 4 : 16584 Before 5 : 16584 After 5 : 16580 Before 6 : 16580 After 6 : 16581 Before 7 : 16581 After 7 : 16582 Before 8 : 16582 After 8 : 16583 Before 9 : 16583 After 9 : 16584 Before 10 : 16584 After 10 : 16580 Before 11 : 16580 After 11 : 16581 Before 12 : 16581 After 12 : 16582 Before 13 : 16582 After 13 : 16583 Before 14 : 16583 After 14 : 16584 Before 15 : 16584 What is the Mystery behind the increase and the subsequent drop ? Thanks. Raghavan V -- http://mail.python.org/mailman/listinfo/python-list
Re: Reference Counts
Hmm... I tried the gc.collect(). It aint helping. The reference count still keeps growing till 5 after it which it drops. As you said, it is not gonna hurt right away. The only downside in that mysterious up and down thingie is that , we could get to a wrong conclusion about a leak, if we ran the algo for say 3 times. Right ? Thanks Heiko for all the help. And in case, you get to decode the mystery behind the increase before the decrease ..kindly let me know. Bye, Raghavan V -- http://mail.python.org/mailman/listinfo/python-list
referrers
Hi All, The sys.getrefcount() is very useful to get the number of references on a particular object. Is there any companion function to get "who" the referrers are ? for e.g. global x global y global z x0=24012 y=x0 z=x0 print "ref count ",sys.getrefcount(x0) This prints a ref count of 5. Basically, I need to know which are the 5 entities who are referring to x0 ? Is there any way of doing it ? Thanks. Bye, raghavan V -- http://mail.python.org/mailman/listinfo/python-list
Re: referrers
Diez,
I did look into gc, specifically gc.get_referrers(), but it seemed to
give me something that I cant decipher.
I added the following line.
print "referrers ",gc.get_referrers(x0)
This is what I got.
referrers [{'__builtins__': ,
'__file__': './tst1.py', 'pdb': , 'sys':
, 'y': 24012, 'gc': ,
'myfuncs': ,
'__name__': '__main__', 'x0': 24012, 'z': 24012, 'os': ,
'__doc__': None, 'types': },
(None, '/home/Raghavan/tst', 'my pid is ', 24012, 'ref count ',
'referrers ')]
Also the len of this is 2, while I got refcount=5. So I dont know
whether this can be used in the same way.
Thanks.
Bye,
Raghavan V
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Accepting a SAML 2 Assertion
Hello, I am working on providing a SSO solution to a customer who acts as an identity provider. He already has IDP on his side to generate SAML 2 assertions with user first name , last name and time stamp as parameters. Our task is to accept this assertion which is signed, decrypt it and send it to the authenticator we already have. The authenticator validates the info and gives access to our application which is written using Python. Here we act as the *service provider.* I am new to SAML and have no idea how to integrate SAML to our current Python application. Can you help me on how to accept these assertion requests from the Idp and decrypt it at Service Provider end using Python. Thanks -- http://mail.python.org/mailman/listinfo/python-list
Windows SSH (remote execution of commands) - Python Automation
Hi experts, I am looking for some information on how to automate remote login to a UNIX machine using ssh from a windows XP box. Possible way: 1. Use putty (or any other ssh client from windows XP). -- Can be automated with command line parameters. The problem is that I am able to login - Putty window opens up as well. But obviously I am unable to run any commands in that. I need to find something like a handle to that Putty window so that I can execute commands there. Can anyone provide me some help in achieving this ? Thanks, -- Raghu -- http://mail.python.org/mailman/listinfo/python-list
RE: string in files
Simple solution: us result=yourString.split(" ") and you get a list with
all the words.
-Original Message-
From: [email protected]
[mailto:[email protected]] On Behalf Of
[email protected]
Sent: Tuesday, December 30, 2008 3:43 PM
To: [email protected]
Subject: string in files
guys i need info on how to call up different words in a line of a file
using python example : file = 'this is a python coding group'
i want to assign a xter to this, is, a, python , coding and group
thanks
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Re: mod_python and PHP sharing same session
Scott wrote: > I am trying to get a mod_python application to read an existing PHP > session. I need some data that was set in the session by the PHP > application. I am using the mod_python Session class but even when I > specify the session id that PHP uses the Session(req, sid) call > returns a new session id. The session file exists in /tmp as > mp_sess.dbm and I have verified that PHP is reading/writing it and from > what I have read mod_python will use the same file. I have used the > PythonOption session DbmSession in the Apache configuration to force > this and specified the filename as well but to no avail. PHP and Python stores the session data differently. One way to fix this problem without the issues of managing file locks is to use override file based session handler of PHP with database based one. You can use MySQL to store this data. Then you need to write a parser in Python to parse the session data of PHP. Since this data is plain text, you don't have to do any reverse engineering to understand its format. Once both these things are ready, you can access the values stored by PHP application from the Python one. By the way, won't it be easy to use cookies to shared data between these two applications? Raghu -- http://mail.python.org/mailman/listinfo/python-list
