Regarding import statement in pox controller
0
I am reading the source code of pox controller. There is an import statement in one module called l3_editing.py which is modified based l3_learning.py.
The import statement is:
from pox.lib.recoco import Timer
Because I do not know Timer, I just along with the source tree to find this struct. But I cannot find this struct Timer, which really make me confused. It should be in pox/lib/recoco.py, but there is no module named recoco.py under lib package.
Items below pox/lib:
Items below pox/lib/recoco:
python import controller sdn pox
edited Nov 15 '18 at 10:06
martineau
68.5k1090183
asked Nov 15 '18 at 9:37
MelvinMelvin
287
add a comment |
0
I am reading the source code of pox controller. There is an import statement in one module called l3_editing.py which is modified based l3_learning.py.
The import statement is:
from pox.lib.recoco import Timer
Because I do not know Timer, I just along with the source tree to find this struct. But I cannot find this struct Timer, which really make me confused. It should be in pox/lib/recoco.py, but there is no module named recoco.py under lib package.
Items below pox/lib:
Items below pox/lib/recoco:
python import controller sdn pox
edited Nov 15 '18 at 10:06
martineau
68.5k1090183
asked Nov 15 '18 at 9:37
MelvinMelvin
287
Look at the contents of thepox/lib/recoco/__init__.pyfile.
– martineau
Nov 15 '18 at 10:11
add a comment |
0
0
0
I am reading the source code of pox controller. There is an import statement in one module called l3_editing.py which is modified based l3_learning.py.
The import statement is:
from pox.lib.recoco import Timer
Because I do not know Timer, I just along with the source tree to find this struct. But I cannot find this struct Timer, which really make me confused. It should be in pox/lib/recoco.py, but there is no module named recoco.py under lib package.
Items below pox/lib:
Items below pox/lib/recoco:
python import controller sdn pox
edited Nov 15 '18 at 10:06
martineau
68.5k1090183
asked Nov 15 '18 at 9:37
MelvinMelvin
287
I am reading the source code of pox controller. There is an import statement in one module called l3_editing.py which is modified based l3_learning.py.
The import statement is:
from pox.lib.recoco import Timer
Because I do not know Timer, I just along with the source tree to find this struct. But I cannot find this struct Timer, which really make me confused. It should be in pox/lib/recoco.py, but there is no module named recoco.py under lib package.
Items below pox/lib:
Items below pox/lib/recoco:
python import controller sdn pox
python import controller sdn pox
edited Nov 15 '18 at 10:06
martineau
68.5k1090183
asked Nov 15 '18 at 9:37
MelvinMelvin
287
edited Nov 15 '18 at 10:06
martineau
68.5k1090183
asked Nov 15 '18 at 9:37
MelvinMelvin
287
edited Nov 15 '18 at 10:06
martineau
68.5k1090183
edited Nov 15 '18 at 10:06
martineau
68.5k1090183
edited Nov 15 '18 at 10:06
martineau
68.5k1090183
68.5k1090183
asked Nov 15 '18 at 9:37
MelvinMelvin
287
asked Nov 15 '18 at 9:37
MelvinMelvin
287
asked Nov 15 '18 at 9:37
MelvinMelvin
287
287
Look at the contents of thepox/lib/recoco/__init__.pyfile.
– martineau
Nov 15 '18 at 10:11
add a comment |
Look at the contents of thepox/lib/recoco/__init__.pyfile.
– martineau
Nov 15 '18 at 10:11
Look at the contents of the
pox/lib/recoco/__init__.py file.– martineau
Nov 15 '18 at 10:11
Look at the contents of the
pox/lib/recoco/__init__.py file.– martineau
Nov 15 '18 at 10:11
add a comment |
1 Answer
1
active
oldest
votes
2
The lib directory is a python package. It contains an __init__.py file. When you import a package this will cause any __init__.py file to be executed. So what's in there?
Just one line:
from recoco import *
Great we are getting closer! Lets look in recoco.py:
...
class Timer (Task):
"""
A simple timer.
...
There you have it!
answered Nov 15 '18 at 9:56
Rob BrichenoRob Bricheno
2,375318
1
thanks, I did not realize that the init.py will be executed. I thought that just is a tag to present that directory is a package.
– Melvin
Nov 15 '18 at 10:23
sorry, I can not agree with you after I have try a simple demo. You are right on some aspects. But could you explain what have still confused me: the statement "from pox.lib.recoco import Timer", it present that I want to import Timer, and Timer is in /pox/lib/recoco, so recoco must be a module which has a suffix .py and Timer must be in recoco.py. The recoco is the end of from keyword, so it won't be a package, because I have try it by a simple demo. And this truth is understandable, because the origin which we want to import from must be a module in the end or it will not be right.
– Melvin
Nov 15 '18 at 10:45
@Melvin Therecocoin yourimportstatement is a package not a module. When we importpox.lib.recocowe are importing the directorypox/lib/recoconot the filepob/lib/recoco/recoco.py. Because a file called__init__.pyis present in the package directory, when we import the package then that file is executed. You might enjoy this question stackoverflow.com/questions/7948494/…
– Rob Bricheno
Nov 15 '18 at 11:48
@Melvin I will not accept your edit because the errors that you have in the example you gave me are caused by running under the Python 3 interpreter. Try your example using the Python 2.7 interpreter (whichpoxrequires) and you will find it works. This behaviour changed from Python 2 to Python 3.
– Rob Bricheno
Nov 15 '18 at 11:50
thanks, I have retry it under python2.7, and it works fine. But I still think that the changes on import in python3 are more understandable. Thanks for your instruction, I have learn a lot from it, good bless to you.
– Melvin
Nov 15 '18 at 12:01
|
show 1 more comment
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
2
The lib directory is a python package. It contains an __init__.py file. When you import a package this will cause any __init__.py file to be executed. So what's in there?
Just one line:
from recoco import *
Great we are getting closer! Lets look in recoco.py:
...
class Timer (Task):
"""
A simple timer.
...
There you have it!
answered Nov 15 '18 at 9:56
Rob BrichenoRob Bricheno
2,375318
1
thanks, I did not realize that the init.py will be executed. I thought that just is a tag to present that directory is a package.
– Melvin
Nov 15 '18 at 10:23
sorry, I can not agree with you after I have try a simple demo. You are right on some aspects. But could you explain what have still confused me: the statement "from pox.lib.recoco import Timer", it present that I want to import Timer, and Timer is in /pox/lib/recoco, so recoco must be a module which has a suffix .py and Timer must be in recoco.py. The recoco is the end of from keyword, so it won't be a package, because I have try it by a simple demo. And this truth is understandable, because the origin which we want to import from must be a module in the end or it will not be right.
– Melvin
Nov 15 '18 at 10:45
@Melvin Therecocoin yourimportstatement is a package not a module. When we importpox.lib.recocowe are importing the directorypox/lib/recoconot the filepob/lib/recoco/recoco.py. Because a file called__init__.pyis present in the package directory, when we import the package then that file is executed. You might enjoy this question stackoverflow.com/questions/7948494/…
– Rob Bricheno
Nov 15 '18 at 11:48
@Melvin I will not accept your edit because the errors that you have in the example you gave me are caused by running under the Python 3 interpreter. Try your example using the Python 2.7 interpreter (whichpoxrequires) and you will find it works. This behaviour changed from Python 2 to Python 3.
– Rob Bricheno
Nov 15 '18 at 11:50
thanks, I have retry it under python2.7, and it works fine. But I still think that the changes on import in python3 are more understandable. Thanks for your instruction, I have learn a lot from it, good bless to you.
– Melvin
Nov 15 '18 at 12:01
|
show 1 more comment
2
The lib directory is a python package. It contains an __init__.py file. When you import a package this will cause any __init__.py file to be executed. So what's in there?
Just one line:
from recoco import *
Great we are getting closer! Lets look in recoco.py:
...
class Timer (Task):
"""
A simple timer.
...
There you have it!
answered Nov 15 '18 at 9:56
Rob BrichenoRob Bricheno
2,375318
1
thanks, I did not realize that the init.py will be executed. I thought that just is a tag to present that directory is a package.
– Melvin
Nov 15 '18 at 10:23
sorry, I can not agree with you after I have try a simple demo. You are right on some aspects. But could you explain what have still confused me: the statement "from pox.lib.recoco import Timer", it present that I want to import Timer, and Timer is in /pox/lib/recoco, so recoco must be a module which has a suffix .py and Timer must be in recoco.py. The recoco is the end of from keyword, so it won't be a package, because I have try it by a simple demo. And this truth is understandable, because the origin which we want to import from must be a module in the end or it will not be right.
– Melvin
Nov 15 '18 at 10:45
@Melvin Therecocoin yourimportstatement is a package not a module. When we importpox.lib.recocowe are importing the directorypox/lib/recoconot the filepob/lib/recoco/recoco.py. Because a file called__init__.pyis present in the package directory, when we import the package then that file is executed. You might enjoy this question stackoverflow.com/questions/7948494/…
– Rob Bricheno
Nov 15 '18 at 11:48
@Melvin I will not accept your edit because the errors that you have in the example you gave me are caused by running under the Python 3 interpreter. Try your example using the Python 2.7 interpreter (whichpoxrequires) and you will find it works. This behaviour changed from Python 2 to Python 3.
– Rob Bricheno
Nov 15 '18 at 11:50
thanks, I have retry it under python2.7, and it works fine. But I still think that the changes on import in python3 are more understandable. Thanks for your instruction, I have learn a lot from it, good bless to you.
– Melvin
Nov 15 '18 at 12:01
|
show 1 more comment
2
2
2
The lib directory is a python package. It contains an __init__.py file. When you import a package this will cause any __init__.py file to be executed. So what's in there?
Just one line:
from recoco import *
Great we are getting closer! Lets look in recoco.py:
...
class Timer (Task):
"""
A simple timer.
...
There you have it!
answered Nov 15 '18 at 9:56
Rob BrichenoRob Bricheno
2,375318
The lib directory is a python package. It contains an __init__.py file. When you import a package this will cause any __init__.py file to be executed. So what's in there?
Just one line:
from recoco import *
Great we are getting closer! Lets look in recoco.py:
...
class Timer (Task):
"""
A simple timer.
...
There you have it!
answered Nov 15 '18 at 9:56
Rob BrichenoRob Bricheno
2,375318
edited Nov 15 '18 at 11:51
answered Nov 15 '18 at 9:56
Rob BrichenoRob Bricheno
2,375318
answered Nov 15 '18 at 9:56
Rob BrichenoRob Bricheno
2,375318
answered Nov 15 '18 at 9:56
Rob BrichenoRob Bricheno
2,375318
2,375318
1
thanks, I did not realize that the init.py will be executed. I thought that just is a tag to present that directory is a package.
– Melvin
Nov 15 '18 at 10:23
sorry, I can not agree with you after I have try a simple demo. You are right on some aspects. But could you explain what have still confused me: the statement "from pox.lib.recoco import Timer", it present that I want to import Timer, and Timer is in /pox/lib/recoco, so recoco must be a module which has a suffix .py and Timer must be in recoco.py. The recoco is the end of from keyword, so it won't be a package, because I have try it by a simple demo. And this truth is understandable, because the origin which we want to import from must be a module in the end or it will not be right.
– Melvin
Nov 15 '18 at 10:45
@Melvin Therecocoin yourimportstatement is a package not a module. When we importpox.lib.recocowe are importing the directorypox/lib/recoconot the filepob/lib/recoco/recoco.py. Because a file called__init__.pyis present in the package directory, when we import the package then that file is executed. You might enjoy this question stackoverflow.com/questions/7948494/…
– Rob Bricheno
Nov 15 '18 at 11:48
@Melvin I will not accept your edit because the errors that you have in the example you gave me are caused by running under the Python 3 interpreter. Try your example using the Python 2.7 interpreter (whichpoxrequires) and you will find it works. This behaviour changed from Python 2 to Python 3.
– Rob Bricheno
Nov 15 '18 at 11:50
thanks, I have retry it under python2.7, and it works fine. But I still think that the changes on import in python3 are more understandable. Thanks for your instruction, I have learn a lot from it, good bless to you.
– Melvin
Nov 15 '18 at 12:01
|
show 1 more comment
1
thanks, I did not realize that the init.py will be executed. I thought that just is a tag to present that directory is a package.
– Melvin
Nov 15 '18 at 10:23
sorry, I can not agree with you after I have try a simple demo. You are right on some aspects. But could you explain what have still confused me: the statement "from pox.lib.recoco import Timer", it present that I want to import Timer, and Timer is in /pox/lib/recoco, so recoco must be a module which has a suffix .py and Timer must be in recoco.py. The recoco is the end of from keyword, so it won't be a package, because I have try it by a simple demo. And this truth is understandable, because the origin which we want to import from must be a module in the end or it will not be right.
– Melvin
Nov 15 '18 at 10:45
@Melvin Therecocoin yourimportstatement is a package not a module. When we importpox.lib.recocowe are importing the directorypox/lib/recoconot the filepob/lib/recoco/recoco.py. Because a file called__init__.pyis present in the package directory, when we import the package then that file is executed. You might enjoy this question stackoverflow.com/questions/7948494/…
– Rob Bricheno
Nov 15 '18 at 11:48
@Melvin I will not accept your edit because the errors that you have in the example you gave me are caused by running under the Python 3 interpreter. Try your example using the Python 2.7 interpreter (whichpoxrequires) and you will find it works. This behaviour changed from Python 2 to Python 3.
– Rob Bricheno
Nov 15 '18 at 11:50
thanks, I have retry it under python2.7, and it works fine. But I still think that the changes on import in python3 are more understandable. Thanks for your instruction, I have learn a lot from it, good bless to you.
– Melvin
Nov 15 '18 at 12:01
1
1
thanks, I did not realize that the init.py will be executed. I thought that just is a tag to present that directory is a package.
– Melvin
Nov 15 '18 at 10:23
thanks, I did not realize that the init.py will be executed. I thought that just is a tag to present that directory is a package.
– Melvin
Nov 15 '18 at 10:23
sorry, I can not agree with you after I have try a simple demo. You are right on some aspects. But could you explain what have still confused me: the statement "from pox.lib.recoco import Timer", it present that I want to import Timer, and Timer is in /pox/lib/recoco, so recoco must be a module which has a suffix .py and Timer must be in recoco.py. The recoco is the end of from keyword, so it won't be a package, because I have try it by a simple demo. And this truth is understandable, because the origin which we want to import from must be a module in the end or it will not be right.
– Melvin
Nov 15 '18 at 10:45
sorry, I can not agree with you after I have try a simple demo. You are right on some aspects. But could you explain what have still confused me: the statement "from pox.lib.recoco import Timer", it present that I want to import Timer, and Timer is in /pox/lib/recoco, so recoco must be a module which has a suffix .py and Timer must be in recoco.py. The recoco is the end of from keyword, so it won't be a package, because I have try it by a simple demo. And this truth is understandable, because the origin which we want to import from must be a module in the end or it will not be right.
– Melvin
Nov 15 '18 at 10:45
@Melvin The
recoco in your import statement is a package not a module. When we import pox.lib.recoco we are importing the directory pox/lib/recoco not the file pob/lib/recoco/recoco.py. Because a file called __init__.py is present in the package directory, when we import the package then that file is executed. You might enjoy this question stackoverflow.com/questions/7948494/…– Rob Bricheno
Nov 15 '18 at 11:48
@Melvin The
recoco in your import statement is a package not a module. When we import pox.lib.recoco we are importing the directory pox/lib/recoco not the file pob/lib/recoco/recoco.py. Because a file called __init__.py is present in the package directory, when we import the package then that file is executed. You might enjoy this question stackoverflow.com/questions/7948494/…– Rob Bricheno
Nov 15 '18 at 11:48
@Melvin I will not accept your edit because the errors that you have in the example you gave me are caused by running under the Python 3 interpreter. Try your example using the Python 2.7 interpreter (which
pox requires) and you will find it works. This behaviour changed from Python 2 to Python 3.– Rob Bricheno
Nov 15 '18 at 11:50
@Melvin I will not accept your edit because the errors that you have in the example you gave me are caused by running under the Python 3 interpreter. Try your example using the Python 2.7 interpreter (which
pox requires) and you will find it works. This behaviour changed from Python 2 to Python 3.– Rob Bricheno
Nov 15 '18 at 11:50
thanks, I have retry it under python2.7, and it works fine. But I still think that the changes on import in python3 are more understandable. Thanks for your instruction, I have learn a lot from it, good bless to you.
– Melvin
Nov 15 '18 at 12:01
thanks, I have retry it under python2.7, and it works fine. But I still think that the changes on import in python3 are more understandable. Thanks for your instruction, I have learn a lot from it, good bless to you.
– Melvin
Nov 15 '18 at 12:01
|
show 1 more comment
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Look at the contents of the
pox/lib/recoco/__init__.pyfile.– martineau
Nov 15 '18 at 10:11