Modifying global variable with same name as local variable
Suppose I have a global variable a. And within a function definition, we also have a local variable named a. Is there any way to assign the value of the global variable to that of the local variable?
a = 'foo'
def my_func(a = 'bar'):
# how to set global a to value of the local a?
python global-variables
asked Apr 19 '12 at 20:10
tskuzzytskuzzy
28.5k1256123
|
show 1 more comment
Suppose I have a global variable a. And within a function definition, we also have a local variable named a. Is there any way to assign the value of the global variable to that of the local variable?
a = 'foo'
def my_func(a = 'bar'):
# how to set global a to value of the local a?
python global-variables
asked Apr 19 '12 at 20:10
tskuzzytskuzzy
28.5k1256123
use 'global a' statement within the function definition?
– newtover
Apr 19 '12 at 20:13
@newtover: But then I can't access the value of the localain order to assign it to the global one.
– tskuzzy
Apr 19 '12 at 20:15
3
WHY???!!1!11one|11!1ELEVE||1!?. To start, using globals is a bad practice, add a parameter to your func or make a class. Second, why would you want to use the same variable name in different contexts and relate their content. Can you try harder in making your code more ugly and confusing?
– KurzedMetal
Apr 19 '12 at 20:19
3
This is exactly why using global variables is discouraged. Even if there is a way to do this, you shouldn't do it. Change the local variable name, or -- better yet -- don't use a global variable.
– senderle
Apr 19 '12 at 20:20
1
A bit late to the party, but whenever I hit the local/global collision issue, I use an empty class as a namespace container (class Container(): pass,settings = Container(),settings.a = 'foo') and store my global variables in there. It's both mutable and distinguishable:if var1 is None: var1 = settings.var1,else: settings.var1 = var1and so on.
– Nisan.H
May 9 '12 at 20:34
|
show 1 more comment
Suppose I have a global variable a. And within a function definition, we also have a local variable named a. Is there any way to assign the value of the global variable to that of the local variable?
a = 'foo'
def my_func(a = 'bar'):
# how to set global a to value of the local a?
python global-variables
asked Apr 19 '12 at 20:10
tskuzzytskuzzy
28.5k1256123
Suppose I have a global variable a. And within a function definition, we also have a local variable named a. Is there any way to assign the value of the global variable to that of the local variable?
a = 'foo'
def my_func(a = 'bar'):
# how to set global a to value of the local a?
python global-variables
python global-variables
asked Apr 19 '12 at 20:10
tskuzzytskuzzy
28.5k1256123
asked Apr 19 '12 at 20:10
tskuzzytskuzzy
28.5k1256123
edited Apr 19 '12 at 20:16
tskuzzy
asked Apr 19 '12 at 20:10
tskuzzytskuzzy
28.5k1256123
asked Apr 19 '12 at 20:10
tskuzzytskuzzy
28.5k1256123
asked Apr 19 '12 at 20:10
tskuzzytskuzzy
28.5k1256123
28.5k1256123
use 'global a' statement within the function definition?
– newtover
Apr 19 '12 at 20:13
@newtover: But then I can't access the value of the localain order to assign it to the global one.
– tskuzzy
Apr 19 '12 at 20:15
3
WHY???!!1!11one|11!1ELEVE||1!?. To start, using globals is a bad practice, add a parameter to your func or make a class. Second, why would you want to use the same variable name in different contexts and relate their content. Can you try harder in making your code more ugly and confusing?
– KurzedMetal
Apr 19 '12 at 20:19
3
This is exactly why using global variables is discouraged. Even if there is a way to do this, you shouldn't do it. Change the local variable name, or -- better yet -- don't use a global variable.
– senderle
Apr 19 '12 at 20:20
1
A bit late to the party, but whenever I hit the local/global collision issue, I use an empty class as a namespace container (class Container(): pass,settings = Container(),settings.a = 'foo') and store my global variables in there. It's both mutable and distinguishable:if var1 is None: var1 = settings.var1,else: settings.var1 = var1and so on.
– Nisan.H
May 9 '12 at 20:34
|
show 1 more comment
use 'global a' statement within the function definition?
– newtover
Apr 19 '12 at 20:13
@newtover: But then I can't access the value of the localain order to assign it to the global one.
– tskuzzy
Apr 19 '12 at 20:15
3
WHY???!!1!11one|11!1ELEVE||1!?. To start, using globals is a bad practice, add a parameter to your func or make a class. Second, why would you want to use the same variable name in different contexts and relate their content. Can you try harder in making your code more ugly and confusing?
– KurzedMetal
Apr 19 '12 at 20:19
3
This is exactly why using global variables is discouraged. Even if there is a way to do this, you shouldn't do it. Change the local variable name, or -- better yet -- don't use a global variable.
– senderle
Apr 19 '12 at 20:20
1
A bit late to the party, but whenever I hit the local/global collision issue, I use an empty class as a namespace container (class Container(): pass,settings = Container(),settings.a = 'foo') and store my global variables in there. It's both mutable and distinguishable:if var1 is None: var1 = settings.var1,else: settings.var1 = var1and so on.
– Nisan.H
May 9 '12 at 20:34
use 'global a' statement within the function definition?
– newtover
Apr 19 '12 at 20:13
use 'global a' statement within the function definition?
– newtover
Apr 19 '12 at 20:13
@newtover: But then I can't access the value of the local
a in order to assign it to the global one.– tskuzzy
Apr 19 '12 at 20:15
@newtover: But then I can't access the value of the local
a in order to assign it to the global one.– tskuzzy
Apr 19 '12 at 20:15
3
3
WHY???!!1!11one|11!1ELEVE||1!?. To start, using globals is a bad practice, add a parameter to your func or make a class. Second, why would you want to use the same variable name in different contexts and relate their content. Can you try harder in making your code more ugly and confusing?– KurzedMetal
Apr 19 '12 at 20:19
WHY???!!1!11one|11!1ELEVE||1!?. To start, using globals is a bad practice, add a parameter to your func or make a class. Second, why would you want to use the same variable name in different contexts and relate their content. Can you try harder in making your code more ugly and confusing?– KurzedMetal
Apr 19 '12 at 20:19
3
3
This is exactly why using global variables is discouraged. Even if there is a way to do this, you shouldn't do it. Change the local variable name, or -- better yet -- don't use a global variable.
– senderle
Apr 19 '12 at 20:20
This is exactly why using global variables is discouraged. Even if there is a way to do this, you shouldn't do it. Change the local variable name, or -- better yet -- don't use a global variable.
– senderle
Apr 19 '12 at 20:20
1
1
A bit late to the party, but whenever I hit the local/global collision issue, I use an empty class as a namespace container (
class Container(): pass, settings = Container(), settings.a = 'foo') and store my global variables in there. It's both mutable and distinguishable: if var1 is None: var1 = settings.var1, else: settings.var1 = var1 and so on.– Nisan.H
May 9 '12 at 20:34
A bit late to the party, but whenever I hit the local/global collision issue, I use an empty class as a namespace container (
class Container(): pass, settings = Container(), settings.a = 'foo') and store my global variables in there. It's both mutable and distinguishable: if var1 is None: var1 = settings.var1, else: settings.var1 = var1 and so on.– Nisan.H
May 9 '12 at 20:34
|
show 1 more comment
4 Answers
4
active
oldest
votes
Use built-in function globals().
globals()
Return a dictionary representing the current global symbol
table. This is always the dictionary of the current module (inside a
function or method, this is the module where it is defined, not the
module from which it is called).
a = 'foo'
def my_func(a = 'bar'):
globals()['a'] = a
BTW, it's worth mentioning that a global is only "global" within the scope of a module.
edited Jan 18 at 18:45
Rob Stewart
72
answered Apr 19 '12 at 20:21
vartecvartec
95.5k26177219
Works perfectly! Thank you!
– tskuzzy
Apr 19 '12 at 20:24
add a comment |
Let python know that you want the global version;
def my_func():
global a
a = 'bar'
answered Apr 19 '12 at 20:13
AlGAlG
10.4k43447
Sorry, rephrased the question. I want to set the globalato the value of the locala.
– tskuzzy
Apr 19 '12 at 20:14
add a comment |
>>> a = 'foo'
>>> def my_func(a='bar'):
... return globals()['a']
...
>>> my_func()
'foo'
answered Apr 19 '12 at 20:23
KurzedMetalKurzedMetal
9,21932952
add a comment |
Don't muddle global and local namespaces to begin with. Always try and use a local variable versus a global one when possible. If you must share variables between scopes you can still pass the variables without need for a global placeholder. Local variables are also referenced much more efficiently accessed than globals.
A few links:
Sharing Variables in Python
Variable performance
answered Apr 19 '12 at 20:25
PenguinCoderPenguinCoder
3,6612036
add a comment |
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4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
Use built-in function globals().
globals()
Return a dictionary representing the current global symbol
table. This is always the dictionary of the current module (inside a
function or method, this is the module where it is defined, not the
module from which it is called).
a = 'foo'
def my_func(a = 'bar'):
globals()['a'] = a
BTW, it's worth mentioning that a global is only "global" within the scope of a module.
edited Jan 18 at 18:45
Rob Stewart
72
answered Apr 19 '12 at 20:21
vartecvartec
95.5k26177219
Works perfectly! Thank you!
– tskuzzy
Apr 19 '12 at 20:24
add a comment |
Use built-in function globals().
globals()
Return a dictionary representing the current global symbol
table. This is always the dictionary of the current module (inside a
function or method, this is the module where it is defined, not the
module from which it is called).
a = 'foo'
def my_func(a = 'bar'):
globals()['a'] = a
BTW, it's worth mentioning that a global is only "global" within the scope of a module.
edited Jan 18 at 18:45
Rob Stewart
72
answered Apr 19 '12 at 20:21
vartecvartec
95.5k26177219
Works perfectly! Thank you!
– tskuzzy
Apr 19 '12 at 20:24
add a comment |
Use built-in function globals().
globals()
Return a dictionary representing the current global symbol
table. This is always the dictionary of the current module (inside a
function or method, this is the module where it is defined, not the
module from which it is called).
a = 'foo'
def my_func(a = 'bar'):
globals()['a'] = a
BTW, it's worth mentioning that a global is only "global" within the scope of a module.
edited Jan 18 at 18:45
Rob Stewart
72
answered Apr 19 '12 at 20:21
vartecvartec
95.5k26177219
Use built-in function globals().
globals()
Return a dictionary representing the current global symbol
table. This is always the dictionary of the current module (inside a
function or method, this is the module where it is defined, not the
module from which it is called).
a = 'foo'
def my_func(a = 'bar'):
globals()['a'] = a
BTW, it's worth mentioning that a global is only "global" within the scope of a module.
edited Jan 18 at 18:45
Rob Stewart
72
answered Apr 19 '12 at 20:21
vartecvartec
95.5k26177219
edited Jan 18 at 18:45
Rob Stewart
72
edited Jan 18 at 18:45
Rob Stewart
72
edited Jan 18 at 18:45
Rob Stewart
72
72
answered Apr 19 '12 at 20:21
vartecvartec
95.5k26177219
answered Apr 19 '12 at 20:21
vartecvartec
95.5k26177219
answered Apr 19 '12 at 20:21
vartecvartec
95.5k26177219
95.5k26177219
Works perfectly! Thank you!
– tskuzzy
Apr 19 '12 at 20:24
add a comment |
Works perfectly! Thank you!
– tskuzzy
Apr 19 '12 at 20:24
Works perfectly! Thank you!
– tskuzzy
Apr 19 '12 at 20:24
Works perfectly! Thank you!
– tskuzzy
Apr 19 '12 at 20:24
add a comment |
Let python know that you want the global version;
def my_func():
global a
a = 'bar'
answered Apr 19 '12 at 20:13
AlGAlG
10.4k43447
Sorry, rephrased the question. I want to set the globalato the value of the locala.
– tskuzzy
Apr 19 '12 at 20:14
add a comment |
Let python know that you want the global version;
def my_func():
global a
a = 'bar'
answered Apr 19 '12 at 20:13
AlGAlG
10.4k43447
Sorry, rephrased the question. I want to set the globalato the value of the locala.
– tskuzzy
Apr 19 '12 at 20:14
add a comment |
Let python know that you want the global version;
def my_func():
global a
a = 'bar'
answered Apr 19 '12 at 20:13
AlGAlG
10.4k43447
Let python know that you want the global version;
def my_func():
global a
a = 'bar'
answered Apr 19 '12 at 20:13
AlGAlG
10.4k43447
answered Apr 19 '12 at 20:13
AlGAlG
10.4k43447
answered Apr 19 '12 at 20:13
AlGAlG
10.4k43447
answered Apr 19 '12 at 20:13
AlGAlG
10.4k43447
10.4k43447
Sorry, rephrased the question. I want to set the globalato the value of the locala.
– tskuzzy
Apr 19 '12 at 20:14
add a comment |
Sorry, rephrased the question. I want to set the globalato the value of the locala.
– tskuzzy
Apr 19 '12 at 20:14
Sorry, rephrased the question. I want to set the global
a to the value of the local a.– tskuzzy
Apr 19 '12 at 20:14
Sorry, rephrased the question. I want to set the global
a to the value of the local a.– tskuzzy
Apr 19 '12 at 20:14
add a comment |
>>> a = 'foo'
>>> def my_func(a='bar'):
... return globals()['a']
...
>>> my_func()
'foo'
answered Apr 19 '12 at 20:23
KurzedMetalKurzedMetal
9,21932952
add a comment |
>>> a = 'foo'
>>> def my_func(a='bar'):
... return globals()['a']
...
>>> my_func()
'foo'
answered Apr 19 '12 at 20:23
KurzedMetalKurzedMetal
9,21932952
add a comment |
>>> a = 'foo'
>>> def my_func(a='bar'):
... return globals()['a']
...
>>> my_func()
'foo'
answered Apr 19 '12 at 20:23
KurzedMetalKurzedMetal
9,21932952
>>> a = 'foo'
>>> def my_func(a='bar'):
... return globals()['a']
...
>>> my_func()
'foo'
answered Apr 19 '12 at 20:23
KurzedMetalKurzedMetal
9,21932952
answered Apr 19 '12 at 20:23
KurzedMetalKurzedMetal
9,21932952
answered Apr 19 '12 at 20:23
KurzedMetalKurzedMetal
9,21932952
answered Apr 19 '12 at 20:23
KurzedMetalKurzedMetal
9,21932952
9,21932952
add a comment |
add a comment |
Don't muddle global and local namespaces to begin with. Always try and use a local variable versus a global one when possible. If you must share variables between scopes you can still pass the variables without need for a global placeholder. Local variables are also referenced much more efficiently accessed than globals.
A few links:
Sharing Variables in Python
Variable performance
answered Apr 19 '12 at 20:25
PenguinCoderPenguinCoder
3,6612036
add a comment |
Don't muddle global and local namespaces to begin with. Always try and use a local variable versus a global one when possible. If you must share variables between scopes you can still pass the variables without need for a global placeholder. Local variables are also referenced much more efficiently accessed than globals.
A few links:
Sharing Variables in Python
Variable performance
answered Apr 19 '12 at 20:25
PenguinCoderPenguinCoder
3,6612036
add a comment |
Don't muddle global and local namespaces to begin with. Always try and use a local variable versus a global one when possible. If you must share variables between scopes you can still pass the variables without need for a global placeholder. Local variables are also referenced much more efficiently accessed than globals.
A few links:
Sharing Variables in Python
Variable performance
answered Apr 19 '12 at 20:25
PenguinCoderPenguinCoder
3,6612036
Don't muddle global and local namespaces to begin with. Always try and use a local variable versus a global one when possible. If you must share variables between scopes you can still pass the variables without need for a global placeholder. Local variables are also referenced much more efficiently accessed than globals.
A few links:
Sharing Variables in Python
Variable performance
answered Apr 19 '12 at 20:25
PenguinCoderPenguinCoder
3,6612036
edited Apr 23 '12 at 13:48
answered Apr 19 '12 at 20:25
PenguinCoderPenguinCoder
3,6612036
answered Apr 19 '12 at 20:25
PenguinCoderPenguinCoder
3,6612036
answered Apr 19 '12 at 20:25
PenguinCoderPenguinCoder
3,6612036
3,6612036
add a comment |
add a comment |
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use 'global a' statement within the function definition?
– newtover
Apr 19 '12 at 20:13
@newtover: But then I can't access the value of the local
ain order to assign it to the global one.– tskuzzy
Apr 19 '12 at 20:15
3
WHY???!!1!11one|11!1ELEVE||1!?. To start, using globals is a bad practice, add a parameter to your func or make a class. Second, why would you want to use the same variable name in different contexts and relate their content. Can you try harder in making your code more ugly and confusing?– KurzedMetal
Apr 19 '12 at 20:19
3
This is exactly why using global variables is discouraged. Even if there is a way to do this, you shouldn't do it. Change the local variable name, or -- better yet -- don't use a global variable.
– senderle
Apr 19 '12 at 20:20
1
A bit late to the party, but whenever I hit the local/global collision issue, I use an empty class as a namespace container (
class Container(): pass,settings = Container(),settings.a = 'foo') and store my global variables in there. It's both mutable and distinguishable:if var1 is None: var1 = settings.var1,else: settings.var1 = var1and so on.– Nisan.H
May 9 '12 at 20:34