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Shared module variable doesn't update?

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1

I'm trying to share (set/get) a variable between packages and modules, but the value isn't changing.

What am I doing wrong?

shared.py

my_shared_value = 'init'

mod_write.py

import mylib.shared
mylib.shared.my_shared_value = 'changed'

mod_read.py

import mylib.shared

while True:
 # outputs always 'init' but should output 'changed' 
 # after mod_set.py was executed.
 print(mylib.shared.my_shared_value)

Execution (same virtual environment)

# Terminal 1
python ./mod_read.py # outputs 'init', runs forever

# Terminal 2
python ./mod_write.py # doesn't affect the output of Terminal 1

python python-3.x module

share|improve this question

edited Mar 28 at 8:47

Mr. B.

asked Mar 28 at 8:35

Mr. B.Mr. B.

3,06655 gold badges3636 silver badges6767 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  minimal reproducible example, please. Show us how you import and execute all of this code. Because there's nothing wrong with it.
  
  – Aran-Fey
  Mar 28 at 8:37
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Aran-Fey Thanks, I'll add more information.
  
  – Mr. B.
  Mar 28 at 8:38
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Aran-Fey I updated my answer. Does it help?
  
  – Mr. B.
  Mar 28 at 8:44
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  It does, yes. Thanks.
  
  – Aran-Fey
  Mar 28 at 8:44
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Dupe: How to share variables across scripts in python?
  
  – Aran-Fey
  Mar 28 at 8:47
  

  
  
  
  

 | 
show 1 more comment

1

I'm trying to share (set/get) a variable between packages and modules, but the value isn't changing.

What am I doing wrong?

shared.py

my_shared_value = 'init'

mod_write.py

import mylib.shared
mylib.shared.my_shared_value = 'changed'

mod_read.py

import mylib.shared

while True:
 # outputs always 'init' but should output 'changed' 
 # after mod_set.py was executed.
 print(mylib.shared.my_shared_value)

Execution (same virtual environment)

# Terminal 1
python ./mod_read.py # outputs 'init', runs forever

# Terminal 2
python ./mod_write.py # doesn't affect the output of Terminal 1

python python-3.x module

share|improve this question

edited Mar 28 at 8:47

Mr. B.

asked Mar 28 at 8:35

Mr. B.Mr. B.

3,06655 gold badges3636 silver badges6767 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  minimal reproducible example, please. Show us how you import and execute all of this code. Because there's nothing wrong with it.
  
  – Aran-Fey
  Mar 28 at 8:37
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Aran-Fey Thanks, I'll add more information.
  
  – Mr. B.
  Mar 28 at 8:38
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Aran-Fey I updated my answer. Does it help?
  
  – Mr. B.
  Mar 28 at 8:44
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  It does, yes. Thanks.
  
  – Aran-Fey
  Mar 28 at 8:44
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Dupe: How to share variables across scripts in python?
  
  – Aran-Fey
  Mar 28 at 8:47
  

  
  
  
  

 | 
show 1 more comment

I'm trying to share (set/get) a variable between packages and modules, but the value isn't changing.

What am I doing wrong?

shared.py

my_shared_value = 'init'

mod_write.py

import mylib.shared
mylib.shared.my_shared_value = 'changed'

mod_read.py

import mylib.shared

while True:
 # outputs always 'init' but should output 'changed' 
 # after mod_set.py was executed.
 print(mylib.shared.my_shared_value)

Execution (same virtual environment)

# Terminal 1
python ./mod_read.py # outputs 'init', runs forever

# Terminal 2
python ./mod_write.py # doesn't affect the output of Terminal 1

python python-3.x module

share|improve this question

edited Mar 28 at 8:47

Mr. B.

asked Mar 28 at 8:35

Mr. B.Mr. B.

3,06655 gold badges3636 silver badges6767 bronze badges

my_shared_value = 'init'

import mylib.shared
mylib.shared.my_shared_value = 'changed'

import mylib.shared

while True:
 # outputs always 'init' but should output 'changed' 
 # after mod_set.py was executed.
 print(mylib.shared.my_shared_value)

# Terminal 1
python ./mod_read.py # outputs 'init', runs forever

# Terminal 2
python ./mod_write.py # doesn't affect the output of Terminal 1

share|improve this question

edited Mar 28 at 8:47

Mr. B.

asked Mar 28 at 8:35

Mr. B.Mr. B.

3,06655 gold badges3636 silver badges6767 bronze badges

share|improve this question

edited Mar 28 at 8:47

Mr. B.

asked Mar 28 at 8:35

Mr. B.Mr. B.

3,06655 gold badges3636 silver badges6767 bronze badges

asked Mar 28 at 8:35

Mr. B.Mr. B.

3,06655 gold badges3636 silver badges6767 bronze badges

asked Mar 28 at 8:35

Mr. B.Mr. B.

3,06655 gold badges3636 silver badges6767 bronze badges

1 Answer
1

active

oldest

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0

To see the result of the mod_write.py file you need to import that file as well(but after your first import).

In your case, you execute files separately, so you don't see the expected result.

Try this way:

import mylib.shared
import mylib.mod_write

while True:
 # outputs always 'init' but should output 'changed' 
 # after mod_set.py was executed.
 print(mylib.shared.my_shared_value)

share|improve this answer

answered Mar 28 at 8:56

Lusine MikayelyanLusine Mikayelyan

1622 bronze badges

add a comment | 

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0

To see the result of the mod_write.py file you need to import that file as well(but after your first import).

In your case, you execute files separately, so you don't see the expected result.

Try this way:

import mylib.shared
import mylib.mod_write

while True:
 # outputs always 'init' but should output 'changed' 
 # after mod_set.py was executed.
 print(mylib.shared.my_shared_value)

share|improve this answer

answered Mar 28 at 8:56

Lusine MikayelyanLusine Mikayelyan

1622 bronze badges

add a comment | 

0

To see the result of the mod_write.py file you need to import that file as well(but after your first import).

In your case, you execute files separately, so you don't see the expected result.

Try this way:

import mylib.shared
import mylib.mod_write

while True:
 # outputs always 'init' but should output 'changed' 
 # after mod_set.py was executed.
 print(mylib.shared.my_shared_value)

share|improve this answer

answered Mar 28 at 8:56

Lusine MikayelyanLusine Mikayelyan

1622 bronze badges

add a comment | 

To see the result of the mod_write.py file you need to import that file as well(but after your first import).

In your case, you execute files separately, so you don't see the expected result.

Try this way:

import mylib.shared
import mylib.mod_write

while True:
 # outputs always 'init' but should output 'changed' 
 # after mod_set.py was executed.
 print(mylib.shared.my_shared_value)

share|improve this answer

answered Mar 28 at 8:56

Lusine MikayelyanLusine Mikayelyan

1622 bronze badges

import mylib.shared
import mylib.mod_write

while True:
 # outputs always 'init' but should output 'changed' 
 # after mod_set.py was executed.
 print(mylib.shared.my_shared_value)

share|improve this answer

answered Mar 28 at 8:56

Lusine MikayelyanLusine Mikayelyan

1622 bronze badges

answered Mar 28 at 8:56

Lusine MikayelyanLusine Mikayelyan

1622 bronze badges

answered Mar 28 at 8:56

Lusine MikayelyanLusine Mikayelyan

1622 bronze badges