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import file without .py into another module

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  import file without .py into another module kevinbercaw@gmail.com - 2014-01-21 06:44 -0800
    Re: import file without .py into another module MRAB <python@mrabarnett.plus.com> - 2014-01-21 15:06 +0000
      Re: import file without .py into another module kevinbercaw@gmail.com - 2014-01-21 07:13 -0800
        Re: import file without .py into another module Tim Chase <python.list@tim.thechases.com> - 2014-01-21 09:36 -0600
        Re: import file without .py into another module Peter Otten <__peter__@web.de> - 2014-01-21 16:40 +0100
          Re: import file without .py into another module kevinbercaw@gmail.com - 2014-01-21 07:50 -0800
            Re: import file without .py into another module Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-01-21 18:10 +0000
    Re: import file without .py into another module kevinbercaw@gmail.com - 2014-01-21 07:27 -0800

#64415 — import file without .py into another module

I have a python script that accepts two arguments:
sys.argv[1] is the full directory path to a config script.  The script is python but does not have a .py extension!
sys.argv[2] is the file name of the config script

For example:
mainScript.py ./ a15800


The config script sets variables that I want to be able to use in the main script.

*** contents of "a15800": ***
myVar = "hello"

*** contents of "mainScript.py": ***
def printVars(configModuleName):
    myVarName = ("%s.myVar" % configModuleName)
    print "myVarName = %s" % myVarName
    myVarValue = eval(myVarName)
    print "myVarValue = %s" % myVarValue


if __name__ == '__main__':
    import sys
    import imp
    filePath = sys.argv[1]
    fileName = sys.argv[2]
    configModuleObject = imp.load_source(fileName, filePath)
    configModuleName = configModuleObject.__name__
    print "configModuleName = %s" % configModuleName
    printVars(configModuleName)

*** Output: ***
>mainScript.py ./ a15800
configModuleName = a15800
myVarName = a15800.myVar
Traceback (most recent call last):
  File "mainScript.py", line 27, in <module>
    printVars(configModuleName)
  File "mainScript.py", line 15, in printVars
    myVarValue = eval(myVarName)
  File "<string>", line 1, in <module>
NameError: name 'a15800' is not defined

*** Question: ***
How do I get the value of the config file variable "myVar"??  It seems it's interpreting the variable name as a string rather than a variable name.  I don't see any python function stringToVariable.

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#64416

On 2014-01-21 14:44, kevinbercaw@gmail.com wrote:
> I have a python script that accepts two arguments:
> sys.argv[1] is the full directory path to a config script.  The script is python but does not have a .py extension!
> sys.argv[2] is the file name of the config script
>
> For example:
> mainScript.py ./ a15800
>
>
> The config script sets variables that I want to be able to use in the main script.
>
> *** contents of "a15800": ***
> myVar = "hello"
>
> *** contents of "mainScript.py": ***
> def printVars(configModuleName):
>      myVarName = ("%s.myVar" % configModuleName)
>      print "myVarName = %s" % myVarName
>      myVarValue = eval(myVarName)
>      print "myVarValue = %s" % myVarValue
>
>
> if __name__ == '__main__':
>      import sys
>      import imp
>      filePath = sys.argv[1]
>      fileName = sys.argv[2]
>      configModuleObject = imp.load_source(fileName, filePath)
>      configModuleName = configModuleObject.__name__
>      print "configModuleName = %s" % configModuleName
>      printVars(configModuleName)
>
> *** Output: ***
>>mainScript.py ./ a15800
> configModuleName = a15800
> myVarName = a15800.myVar
> Traceback (most recent call last):
>    File "mainScript.py", line 27, in <module>
>      printVars(configModuleName)
>    File "mainScript.py", line 15, in printVars
>      myVarValue = eval(myVarName)
>    File "<string>", line 1, in <module>
> NameError: name 'a15800' is not defined
>
> *** Question: ***
> How do I get the value of the config file variable "myVar"??  It seems it's interpreting the variable name as a string rather than a variable name.  I don't see any python function stringToVariable.
>
The line:

     configModuleObject = imp.load_source(fileName, filePath)

imports the module and then binds it to the name configModuleObject,
therefore:

     print configModuleObject.myVar

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#64417

On Tuesday, January 21, 2014 10:06:16 AM UTC-5, MRAB wrote:
> On 2014-01-21 14:44,  wrote:
> 
> > I have a python script that accepts two arguments:
> 
> > sys.argv[1] is the full directory path to a config script.  The script is python but does not have a .py extension!
> 
> > sys.argv[2] is the file name of the config script
> 
> >
> 
> > For example:
> 
> > mainScript.py ./ a15800
> 
> >
> 
> >
> 
> > The config script sets variables that I want to be able to use in the main script.
> 
> >
> 
> > *** contents of "a15800": ***
> 
> > myVar = "hello"
> 
> >
> 
> > *** contents of "mainScript.py": ***
> 
> > def printVars(configModuleName):
> 
> >      myVarName = ("%s.myVar" % configModuleName)
> 
> >      print "myVarName = %s" % myVarName
> 
> >      myVarValue = eval(myVarName)
> 
> >      print "myVarValue = %s" % myVarValue
> 
> >
> 
> >
> 
> > if __name__ == '__main__':
> 
> >      import sys
> 
> >      import imp
> 
> >      filePath = sys.argv[1]
> 
> >      fileName = sys.argv[2]
> 
> >      configModuleObject = imp.load_source(fileName, filePath)
> 
> >      configModuleName = configModuleObject.__name__
> 
> >      print "configModuleName = %s" % configModuleName
> 
> >      printVars(configModuleName)
> 
> >
> 
> > *** Output: ***
> 
> >>mainScript.py ./ a15800
> 
> > configModuleName = a15800
> 
> > myVarName = a15800.myVar
> 
> > Traceback (most recent call last):
> 
> >    File "mainScript.py", line 27, in <module>
> 
> >      printVars(configModuleName)
> 
> >    File "mainScript.py", line 15, in printVars
> 
> >      myVarValue = eval(myVarName)
> 
> >    File "<string>", line 1, in <module>
> 
> > NameError: name 'a15800' is not defined
> 
> >
> 
> > *** Question: ***
> 
> > How do I get the value of the config file variable "myVar"??  It seems it's interpreting the variable name as a string rather than a variable name.  I don't see any python function stringToVariable.
> 
> >
> 
> The line:
> 
> 
> 
>      configModuleObject = imp.load_source(fileName, filePath)
> 
> 
> 
> imports the module and then binds it to the name configModuleObject,
> 
> therefore:
> 
> 
> 
>      print configModuleObject.myVar

Yep, I tried that right off as that's how I thought it would work, but it doesn't work.
Traceback (most recent call last):
  File "mainScript.py", line 31, in <module>
    print configModuleObject.myVar
AttributeError: 'module' object has no attribute 'myVar'

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#64422

On 2014-01-21 07:13, kevinbercaw@gmail.com wrote:
>On Tuesday, January 21, 2014 10:06:16 AM UTC-5, MRAB wrote:
>>      configModuleObject = imp.load_source(fileName, filePath)
>> 
>> imports the module and then binds it to the name
>> configModuleObject,
>> 
>> therefore:
>>
>>      print configModuleObject.myVar
> 
> Yep, I tried that right off as that's how I thought it would work,
> but it doesn't work. Traceback (most recent call last):
>   File "mainScript.py", line 31, in <module>
>     print configModuleObject.myVar
> AttributeError: 'module' object has no attribute 'myVar'

Check what you're passing for fileName/FilePath:

 >>> import imp
 >>> with open('demo.txt', 'wb') as f:
 ...     f.write('x = 42\ny = "hello"\n')
 ... 
 >>> d = imp.load_source('SomeName', 'demo.txt')
 >>> dir(d)
 ['__builtins__', '__doc__', '__file__', '__name__', '__package__',
 'x', 'y']
 >>> d.x
 42
 >>> d.y
 'hello'
 >>> d.__name__
 'SomeName'

-tkc

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#64424

kevinbercaw@gmail.com wrote:

>> > How do I get the value of the config file variable "myVar"??  It seems
>> > it's interpreting the variable name as a string rather than a variable
>> > name.  I don't see any python function stringToVariable.

>> The line:
>> 
>>      configModuleObject = imp.load_source(fileName, filePath)

>> imports the module and then binds it to the name configModuleObject,
>> 
>> therefore:
>> 
>>      print configModuleObject.myVar
> 
> Yep, I tried that right off as that's how I thought it would work, but it
> doesn't work. Traceback (most recent call last):
>   File "mainScript.py", line 31, in <module>
>     print configModuleObject.myVar
> AttributeError: 'module' object has no attribute 'myVar'

Try again with

module = imp.load_source("made_up_name", "a15800")
print module.myVar

If the file "a15800" is not in the current working directory, give the 
complete path, e. g:

module = imp.load_source("made_up_name", "/path/to/a15800")
print module.myVar

The first arg serves as the module's name which is used for caching to speed 
up repeated imports:

>>> import imp
>>> import sys
>>> "made_up_name" in sys.modules
False
>>> module = imp.load_source("made_up_name", "a15800")
>>> module.myVar
'hello'
>>> "made_up_name" in sys.modules
True
>>> module
<module 'made_up_name' from 'a15800c'>

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#64426

On Tuesday, January 21, 2014 10:40:09 AM UTC-5, Peter Otten wrote:
> kevin...@gmail.com wrote:
> 
> 
> 
> >> > How do I get the value of the config file variable "myVar"??  It seems
> 
> >> > it's interpreting the variable name as a string rather than a variable
> 
> >> > name.  I don't see any python function stringToVariable.
> 
> 
> 
> >> The line:
> 
> >> 
> 
> >>      configModuleObject = imp.load_source(fileName, filePath)
> 
> 
> 
> >> imports the module and then binds it to the name configModuleObject,
> 
> >> 
> 
> >> therefore:
> 
> >> 
> 
> >>      print configModuleObject.myVar
> 
> > 
> 
> > Yep, I tried that right off as that's how I thought it would work, but it
> 
> > doesn't work. Traceback (most recent call last):
> 
> >   File "mainScript.py", line 31, in <module>
> 
> >     print configModuleObject.myVar
> 
> > AttributeError: 'module' object has no attribute 'myVar'
> 
> 
> 
> Try again with
> 
> 
> 
> module = imp.load_source("made_up_name", "a15800")
> 
> print module.myVar
> 
> 
> 
> If the file "a15800" is not in the current working directory, give the 
> 
> complete path, e. g:
> 
> 
> 
> module = imp.load_source("made_up_name", "/path/to/a15800")
> 
> print module.myVar
> 
> 
> 
> The first arg serves as the module's name which is used for caching to speed 
> 
> up repeated imports:
> 
> 
> 
> >>> import imp
> 
> >>> import sys
> 
> >>> "made_up_name" in sys.modules
> 
> False
> 
> >>> module = imp.load_source("made_up_name", "a15800")
> 
> >>> module.myVar
> 
> 'hello'
> 
> >>> "made_up_name" in sys.modules
> 
> True
> 
> >>> module
> 
> <module 'made_up_name' from 'a15800c'>

Thanks Peter Otten, that worked.  I was not able to understand the documentation for imp.load_source correctly.  Thanks so much!

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#64435

On 21/01/2014 15:50, kevinbercaw@gmail.com wrote:

[snipped the double line spaced stuff courtesy of google]

Would you please read and action this 
https://wiki.python.org/moin/GoogleGroupsPython to prevent us seeing the 
double line spacing that google inserts, thanks.

-- 
My fellow Pythonistas, ask not what our language can do for you, ask 
what you can do for our language.

Mark Lawrence

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#64420

On Tuesday, January 21, 2014 9:44:13 AM UTC-5, kevin...@gmail.com wrote:
> I have a python script that accepts two arguments:
> 
> sys.argv[1] is the full directory path to a config script.  The script is python but does not have a .py extension!
> 
> sys.argv[2] is the file name of the config script
> 
> 
> 
> For example:
> 
> mainScript.py ./ a15800
> 
> 
> 
> 
> 
> The config script sets variables that I want to be able to use in the main script.
> 
> 
> 
> *** contents of "a15800": ***
> 
> myVar = "hello"
> 
> 
> 
> *** contents of "mainScript.py": ***
> 
> def printVars(configModuleName):
> 
>     myVarName = ("%s.myVar" % configModuleName)
> 
>     print "myVarName = %s" % myVarName
> 
>     myVarValue = eval(myVarName)
> 
>     print "myVarValue = %s" % myVarValue
> 
> 
> 
> 
> 
> if __name__ == '__main__':
> 
>     import sys
> 
>     import imp
> 
>     filePath = sys.argv[1]
> 
>     fileName = sys.argv[2]
> 
>     configModuleObject = imp.load_source(fileName, filePath)
> 
>     configModuleName = configModuleObject.__name__
> 
>     print "configModuleName = %s" % configModuleName
> 
>     printVars(configModuleName)
> 
> 
> 
> *** Output: ***
> 
> >mainScript.py ./ a15800
> 
> configModuleName = a15800
> 
> myVarName = a15800.myVar
> 
> Traceback (most recent call last):
> 
>   File "mainScript.py", line 27, in <module>
> 
>     printVars(configModuleName)
> 
>   File "mainScript.py", line 15, in printVars
> 
>     myVarValue = eval(myVarName)
> 
>   File "<string>", line 1, in <module>
> 
> NameError: name 'a15800' is not defined
> 
> 
> 
> *** Question: ***
> 
> How do I get the value of the config file variable "myVar"??  It seems it's interpreting the variable name as a string rather than a variable name.  I don't see any python function stringToVariable.

FYI - more info from interactive session, query configModuleObject and configModuleName using imp.find_module:
>>> imp.find_module("configModuleObject")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named configModuleObject
>>> imp.find_module("a15800")
(<open file 'a15800.pyc', mode 'rb' at 0x2b503b72d288>, 'a15800.pyc', ('.pyc', 'rb', 2))
>>> imp.find_module(configModuleName)
(<open file 'a15800.pyc', mode 'rb' at 0x2b503b72d300>, 'a15800.pyc', ('.pyc', 'rb', 2))

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