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global vars across modules
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mambo...@gmail.com
Apr 22, 2012, 3:39:38 PM4/22/12
to
I need to use global var across files/modules:
# file_1.py
a = 0
def funct_1() :
a = 1 # a is global
print(a)
# file_2.py
from file_1 import *
def main() :
funct_1()
a = 2 # a is local, it's not imported
print(a)
Here above 'a' is not imported from file_1, it's local.
The only way I was able to access the global 'a' is the following:
# file_2.py
from file_1 import *
import file_1
def main() :
funct_1()
file_1.a = 2 # a is the global from file_1
print(file_1.a)
Question:
How can I access to the global 'a' in file_2 without resorting to the whole name 'file_1.a' ?
Thanks!
# file_1.py
a = 0
def funct_1() :
a = 1 # a is global
print(a)
# file_2.py
from file_1 import *
def main() :
funct_1()
a = 2 # a is local, it's not imported
print(a)
Here above 'a' is not imported from file_1, it's local.
The only way I was able to access the global 'a' is the following:
# file_2.py
from file_1 import *
import file_1
def main() :
funct_1()
file_1.a = 2 # a is the global from file_1
print(file_1.a)
Question:
How can I access to the global 'a' in file_2 without resorting to the whole name 'file_1.a' ?
Thanks!
Roy Smith
Apr 22, 2012, 3:48:23 PM4/22/12
to
In article
<2652842.660.1335123578432.JavaMail.geo-discussion-forums@pbckz3>,
[...]
Answer 2: You might want to look at thread local storage
(http://docs.python.org/library/threading.html#threading.local).
Answer 3: Are you sure you really want to do this?
<2652842.660.1335123578432.JavaMail.geo-discussion-forums@pbckz3>,
[...]
> Question:
> How can I access to the global 'a' in file_2 without resorting to the whole
> name 'file_1.a' ?
Answer 1: You can't.
> How can I access to the global 'a' in file_2 without resorting to the whole
> name 'file_1.a' ?
Answer 2: You might want to look at thread local storage
(http://docs.python.org/library/threading.html#threading.local).
Answer 3: Are you sure you really want to do this?
mambo...@gmail.com
Apr 22, 2012, 4:08:05 PM4/22/12
to
On Sunday, April 22, 2012 12:48:23 PM UTC-7, Roy Smith wrote:
....
A generic module, used across different independent programs, puts its computing results in a var fairly big, ~50KB.
I need the functions in these programs to access that var. No assignment will be made to that var, it will just be accessed to parse its content.
How can I do? I cannot think of making that var local and 'returning' ~50KB all the times the module is called.
Any hint...?
....
> Answer 1: You can't.
>
> Answer 2: You might want to look at thread local storage
> (http://docs.python.org/library/threading.html#threading.local).
>
> Answer 3: Are you sure you really want to do this?
Thanks! Here is what I need to do, perhaps you can give me some hints.
>
> Answer 2: You might want to look at thread local storage
> (http://docs.python.org/library/threading.html#threading.local).
>
> Answer 3: Are you sure you really want to do this?
A generic module, used across different independent programs, puts its computing results in a var fairly big, ~50KB.
I need the functions in these programs to access that var. No assignment will be made to that var, it will just be accessed to parse its content.
How can I do? I cannot think of making that var local and 'returning' ~50KB all the times the module is called.
Any hint...?
Roy Smith
Apr 22, 2012, 4:53:18 PM4/22/12
to
In article
<11146533.5.1335125285850.JavaMail.geo-discussion-forums@pboo1>,
> How can I do? I cannot think of making that var local and 'returning' ~50KB
> all the times the module is called.
Why not? If you return a 50 kb string or some other data structure,
you're not actually copying 50 kb of data, you're just returning a
handle to the data object.
<11146533.5.1335125285850.JavaMail.geo-discussion-forums@pboo1>,
mambo...@gmail.com wrote:
> On Sunday, April 22, 2012 12:48:23 PM UTC-7, Roy Smith wrote:
> ....
> > Answer 1: You can't.
> >
> > Answer 2: You might want to look at thread local storage
> > (http://docs.python.org/library/threading.html#threading.local).
> >
> > Answer 3: Are you sure you really want to do this?
>
> Thanks! Here is what I need to do, perhaps you can give me some hints.
>
> A generic module, used across different independent programs, puts its
> computing results in a var fairly big, ~50KB.
Why do they do that? Why don't they just return the result?
> On Sunday, April 22, 2012 12:48:23 PM UTC-7, Roy Smith wrote:
> ....
> > Answer 1: You can't.
> >
> > Answer 2: You might want to look at thread local storage
> > (http://docs.python.org/library/threading.html#threading.local).
> >
> > Answer 3: Are you sure you really want to do this?
>
> Thanks! Here is what I need to do, perhaps you can give me some hints.
>
> A generic module, used across different independent programs, puts its
> computing results in a var fairly big, ~50KB.
> How can I do? I cannot think of making that var local and 'returning' ~50KB
> all the times the module is called.
you're not actually copying 50 kb of data, you're just returning a
handle to the data object.
Kiuhnm
Apr 22, 2012, 5:08:29 PM4/22/12
to
On 4/22/2012 21:39, mambo...@gmail.com wrote:
> I need to use global var across files/modules:
>
> # file_1.py
> a = 0
> def funct_1() :
> a = 1 # a is global
> print(a)
>
>
> # file_2.py
> from file_1 import *
> def main() :
> funct_1()
> a = 2 # a is local, it's not imported
> print(a)
You just forgot to declare 'a' as global inside your functions.
> I need to use global var across files/modules:
>
> # file_1.py
> a = 0
> def funct_1() :
> a = 1 # a is global
> print(a)
>
>
> # file_2.py
> from file_1 import *
> def main() :
> funct_1()
> a = 2 # a is local, it's not imported
> print(a)
# file_1.py
a = 0
def funct_1() :
a = 1 # a is global
print(a)
# file_2.py
from file_1 import *
def main() :
global a
print(a)
# file_2.py
from file_1 import *
def main() :
funct_1()
a = 2 # a is global
print(a)
When you write 'a = 1' and 'a = 2' you create local variables named 'a'
local to your functions, unless you specify that you're referring to a
global variable by declaring 'a' as 'global'.
Kiuhnm
John Nagle
Apr 22, 2012, 5:38:28 PM4/22/12
to
On 4/22/2012 12:39 PM, mambo...@gmail.com wrote:
>
> Question:
> How can I access to the global 'a' in file_2 without resorting to the whole name 'file_1.a' ?
Actually, it's better to use the fully qualified name "file_1.a".
>
> Question:
> How can I access to the global 'a' in file_2 without resorting to the whole name 'file_1.a' ?
Using "import *" brings in everything in the other module, which often
results in a name clash.
Just do
import file_1
and, if desired
localnamefora = file_1.a
John Nagle
Kiuhnm
Apr 22, 2012, 6:13:19 PM4/22/12
to
and I thought "from file_1 import *" worked differently. What a
surprise. It makes sense though.
"Import" imports values, not variables.
Anyway, you don't need all this.
Kiuhnm
mambo...@gmail.com
Apr 22, 2012, 6:46:02 PM4/22/12
to
Thanks a lot to everyone! This stuff is clear now.
All the best.
All the best.
Thomas 'PointedEars' Lahn
Apr 25, 2012, 4:13:49 AM4/25/12
to
from file_1 import a as localnamefora
instead, unless `localnamefora' should be the identifier of a
(function-)local variable.
<http://docs.python.org/release/2.7.3/reference/simple_stmts.html#the-
import-statement>
<http://docs.python.org/py3k/reference/simple_stmts.html#the-import-
statement>
--
PointedEars
Please do not Cc: me. / Bitte keine Kopien per E-Mail.
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