Preload/Globally certain classes in Python
I Have got some models (mapped on database tables), in a python project. I want to make them preload when the project bootup so i don't need to do like this in every file
from db.models.user import User
I tried to load them in init.py file, but they are not available.
python-3.x
asked Nov 16 '18 at 2:02
GullGull
1,34721223
add a comment |
I Have got some models (mapped on database tables), in a python project. I want to make them preload when the project bootup so i don't need to do like this in every file
from db.models.user import User
I tried to load them in init.py file, but they are not available.
python-3.x
asked Nov 16 '18 at 2:02
GullGull
1,34721223
add a comment |
I Have got some models (mapped on database tables), in a python project. I want to make them preload when the project bootup so i don't need to do like this in every file
from db.models.user import User
I tried to load them in init.py file, but they are not available.
python-3.x
asked Nov 16 '18 at 2:02
GullGull
1,34721223
I Have got some models (mapped on database tables), in a python project. I want to make them preload when the project bootup so i don't need to do like this in every file
from db.models.user import User
I tried to load them in init.py file, but they are not available.
python-3.x
python-3.x
asked Nov 16 '18 at 2:02
GullGull
1,34721223
asked Nov 16 '18 at 2:02
GullGull
1,34721223
asked Nov 16 '18 at 2:02
GullGull
1,34721223
asked Nov 16 '18 at 2:02
GullGull
1,34721223
asked Nov 16 '18 at 2:02
GullGull
1,34721223
1,34721223
add a comment |
add a comment |
1 Answer
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TL;DR: You need to import your models in every file.
In Python, every module (*.py file) has its own namespace (set of global variables). There is no way to have a truly global variable (or class, function, etc.), because every name is local to the module in which it is defined. This is a deliberate feature of Python; it would be very bad if (for example) you could redefine the range() function in some random module and break everyone else's code.
You can place the import from db.models.user import User in db/models/__init__.py, but that won't make User globally accessible. Instead, it will create an alias db.models.User for the original class (db.models.user.User), which you still have to import as normal. This may save you a small amount of typing when importing the model in other places, and is a great way to flatten deep hierarchies of packages, but it does not make anything truly global, because you cannot make things global.
answered Nov 16 '18 at 2:49
KevinKevin
18.6k53559
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
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active
oldest
votes
TL;DR: You need to import your models in every file.
In Python, every module (*.py file) has its own namespace (set of global variables). There is no way to have a truly global variable (or class, function, etc.), because every name is local to the module in which it is defined. This is a deliberate feature of Python; it would be very bad if (for example) you could redefine the range() function in some random module and break everyone else's code.
You can place the import from db.models.user import User in db/models/__init__.py, but that won't make User globally accessible. Instead, it will create an alias db.models.User for the original class (db.models.user.User), which you still have to import as normal. This may save you a small amount of typing when importing the model in other places, and is a great way to flatten deep hierarchies of packages, but it does not make anything truly global, because you cannot make things global.
answered Nov 16 '18 at 2:49
KevinKevin
18.6k53559
add a comment |
TL;DR: You need to import your models in every file.
In Python, every module (*.py file) has its own namespace (set of global variables). There is no way to have a truly global variable (or class, function, etc.), because every name is local to the module in which it is defined. This is a deliberate feature of Python; it would be very bad if (for example) you could redefine the range() function in some random module and break everyone else's code.
You can place the import from db.models.user import User in db/models/__init__.py, but that won't make User globally accessible. Instead, it will create an alias db.models.User for the original class (db.models.user.User), which you still have to import as normal. This may save you a small amount of typing when importing the model in other places, and is a great way to flatten deep hierarchies of packages, but it does not make anything truly global, because you cannot make things global.
answered Nov 16 '18 at 2:49
KevinKevin
18.6k53559
add a comment |
TL;DR: You need to import your models in every file.
In Python, every module (*.py file) has its own namespace (set of global variables). There is no way to have a truly global variable (or class, function, etc.), because every name is local to the module in which it is defined. This is a deliberate feature of Python; it would be very bad if (for example) you could redefine the range() function in some random module and break everyone else's code.
You can place the import from db.models.user import User in db/models/__init__.py, but that won't make User globally accessible. Instead, it will create an alias db.models.User for the original class (db.models.user.User), which you still have to import as normal. This may save you a small amount of typing when importing the model in other places, and is a great way to flatten deep hierarchies of packages, but it does not make anything truly global, because you cannot make things global.
answered Nov 16 '18 at 2:49
KevinKevin
18.6k53559
TL;DR: You need to import your models in every file.
In Python, every module (*.py file) has its own namespace (set of global variables). There is no way to have a truly global variable (or class, function, etc.), because every name is local to the module in which it is defined. This is a deliberate feature of Python; it would be very bad if (for example) you could redefine the range() function in some random module and break everyone else's code.
You can place the import from db.models.user import User in db/models/__init__.py, but that won't make User globally accessible. Instead, it will create an alias db.models.User for the original class (db.models.user.User), which you still have to import as normal. This may save you a small amount of typing when importing the model in other places, and is a great way to flatten deep hierarchies of packages, but it does not make anything truly global, because you cannot make things global.
answered Nov 16 '18 at 2:49
KevinKevin
18.6k53559
answered Nov 16 '18 at 2:49
KevinKevin
18.6k53559
answered Nov 16 '18 at 2:49
KevinKevin
18.6k53559
answered Nov 16 '18 at 2:49
KevinKevin
18.6k53559
18.6k53559
add a comment |
add a comment |
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