I am trying to write a WLST script.
As I found that I always repeat doing similar setup, I tried to make some util functions to ease my script writing.
Later when I tried to pull those functions to an external .py as a module, I failed to do so:
assume I have a main script (domain_config.py), and the util function script (wlst_util.py)
Here is what I put in domain_config.py:
import wlst_util import *
loadProperties('domain.properties')
....
create_jms_conn_factory(....);
First it complains for my delcaration in the wlst_util.py for the method:
create_jms_conn_factory(...., is_xa=False)
it complains "NameError: False".
ok, then I remove the default param, then it complains for those cd() function (provided by WLST).
Then I tried to do "from wl import *" in wlst_util.py, the script failed at loadProperties line (NullPointerException).
I tried to put the import after loadProperties, then the cmo variable in my main script become None...
What is the right way I should do just for pulling those util function to a separate file?..
Thanks
Related
I'm trying to use multiple files in my programing and I ran into a problem.
I have two files: main.py, nu.py
The main file is:
import numpy
import nu
def numarray():
numpy.array(some code goes here)
nu.createarray()
The nu file is:
def createarray():
numpy.array(some code goes here)
When I run main I get an error:
File "D:\python\nu.py", line 2, in createarray
numpy.array(some code goes here)
NameError: name 'numpy' is not defined
numpy is just an exaple, I'm using about six imports.
As far as I see it, I have to import all moduls on all files, but it creating a problem where certain modules can't be loaded twice, it just hang.
What I'm doing wrong and how can I properly import functions from another file while using imported modules from the main file?
I hope i explain it well.
thanks for helping!
I have years in python and importing from other files is still a headache..
The problmen here is that you are not importing numpy in "nu.py".
But as you say sometimes it's a little annoying have to import al libraries in all files.
The last thing is, How do you get the error a module cannot be imported twice? can you give me an example?
In each separate python script if you are using a module within you need to import it to access. So you will need to 'import numpy' in your nu.py script like below
If possible try keeping the use of a module within a script so you dont have import the same multiple times, although this wont always be appropriate
I have a Python program where a function imports another script and runs it. But the script gets run only the first time the function is called.
def Open_Generator(event):
import PasswordGenerator
Any tips?
*The function is called using a button in a tkinter window
This is by design. You should only import a module once. Trying to import a module more than once will cause Python to re-fetch the module object from the cache, but this won't cause the module's code to execute a second time.
Most well-designed modules won't do anything right away when you import them, or at least won't do anything obviously visible. Generally, if you want a module to do work, you need to call one of its functions.
I'm guessing your PasswordGenerator module has some code at the file-level scope. In other words, it has code that isn't inside a function. Try to move that code into a function. Then you can call that function from Open_Generator.
import PasswordGenerator
def Open_Generator(event):
my_password = PasswordGenerator.generate_password()
I want to execute a function once a module is imported. I know I can just call the function directly at the end of the module to achieve this.
For eg..
# Inside File Test.py
import something
from test import sayhi
# Lots of functions and classes are defined here
# End of the module
sayhi()
But, Since there will be several people changing the file continuously, I do not want to put sayhi() at the end of the file but want sayhi() to be called once the loading finishes. is there a hook in python that executes once the import module statement finishes? I am looking for something like sys.settrace with the difference being it should be called only after the import finishes.
I want to make my own programming language based on python which will provide additional features that python wasn't provide, for example to make multiline anonymous function with custom syntax. I want my programming language is so simple to be used, just import my script, then I read the script file which is imported my script, then process it's code and stop anymore execution of the script which called my script to prevent error on syntax...
Let say there are 2 py file, main.py and MyLanguage.py
The main.py imported MyLanguage.py
Then how to get the main.py file from MyLanguage.py if main.py can be another name(Dynamic Name)?
Additional information:
I using python 3.4.4 on Windows 7
Like Colonder, I believe the project you have in mind is far more difficult than you imagine.
But, to get you started, here is how to get the main.py file from inside MyLanguage.py. If your importing module looks like this
# main.py
import MyLanguage
if __name__ == "__main__":
print("Hello world from main.py")
and the module it is importing looks like this, in Python 3:
#MyLanguage.py
import inspect
def caller_discoverer():
print('Importing file is', inspect.stack()[-1].filename)
caller_discoverer()
or (edit) like this, in Python 2:
#MyLanguage.py
import inspect
def caller_discoverer():
print 'Importing file is', inspect.stack()[-1][1]
caller_discoverer()
then the output you will get when you run main.py is
Importing file is E:/..blahblahblah../StackOverflow-3.6/48034902/main.py
Hello world from main.py
I believe this answers the question you asked, though I don't think it goes very far towards achieving what you want. The reason for my scepticism is simple: the import statement expects a file containing valid Python, and if you want to import a file with your own non-Python syntax, then you are going to have to do some very clever stuff with import hooks. Without that, your program will simply fail at the import statement with a syntax error.
Best of luck.
I imported a module as below:
filename = "email"
mymodule = __import__('actions.'+filename)
the problem I have with this is, that the file is immediatly executing, and I would much rather execute a specific function from the file (that way I can send variables through it).
I am basically working with plugins, so it works.
Edit:
for the time being, I am not concerned with whether or not the script executes when I add the line below:
mymodule = __import__('actions.'+filename)
but what I would like to work is when I add the line below, I would like the function to execute. But instead I get an error that the module dosn't have that function even though it exisits in the script.
mymodule.dosomething(n)
Edit:
I personally don't think that the function has anything to do with it but here is one python files that I am trying to open.
import webbrowser
def OpenEmail():
handle = webbrowser.get()
handle.open('http://gmail.google.com')
OpenEmail()
print "Your email has been opened"
The functions don't exist unless the module executes. You can't have it both ways. Perhaps you need to add a main stanza to the module.
The problem is, that you get the actions module returned. Try this:
mymodule = __import__('actions.'+filename)
for submodule in filename.split('.'):
mymodule = getattr(mymodule, submodule)
This happens when you try importing a submodule, i.e. module.something.somethingelse, you get module returned.