global name 'sqrt' is not defined

Nick Matzke matzke at berkeley.edu
Fri Feb 6 01:48:09 CET 2009


OK, so the problem was that I had to exit ipython, re-enter it, and then 
import my module to get the errors to disappear.  Thanks for the help!

(PS: Is there a way to force a complete reload of a module, without 
exiting ipython?  Just doing the import command again doesn't seem to do 
it.)

Thanks!
Nick


Diez B. Roggisch wrote:
> Nick Matzke schrieb:
>>
>>
>> Scott David Daniels wrote:
>>> M.-A. Lemburg wrote:
>>>> On 2009-02-05 10:08, Nick Matzke wrote:
>>>>> ..., I can run this in the ipython shell just fine:
>>>>> a = ["12", "15", "16", "38.2"]
>>>>> dim = int(sqrt(size(a)))
>>>>> ...But if I move these commands to a function in another file, it 
>>>>> freaks out:
>>>> You need to add:
>>>>
>>>> from math import sqrt
>>> or:
>>>     from cmath import sqrt
>>> or:
>>>     from numpy import sqrt
>>
>>
>>
>>
>>
>> The weird thing is, when I do this, I still get the error:
>>
>> ============
>> nick at mws2[phylocom]|27> a = ["12", "15", "16", "38.2"]
>> nick at mws2[phylocom]|28> from LR_run_functions_v2 import 
>> make_half_square_array
>> nick at mws2[phylocom]|24> d = make_half_square_array(a)
>> --------------------------------------------------------------------------- 
>>
>> NameError                                 Traceback (most recent call 
>> last)
>>
>> /bioinformatics/phylocom/<ipython console> in <module>()
>>
>> /bioinformatics/phylocom/_scripts/LR_run_functions_v2.py in 
>> make_half_square_array(linear_version_of_square_array)
>>    1548         from numpy import sqrt
>>    1549         a = linear_version_of_square_array
>> -> 1550         dim = int(sqrt(size(a)))
>>    1551
>>    1552
>>
>> NameError: global name 'sqrt' is not defined
>> nick at mws2[phylocom]|25>
>> ============
>>
>> Is there some other place I should put the import command?  I.e.:
>> 1. In the main script/ipython command line
>>
>> 2. In the called function, i.e. make_half_square_array() in 
>> LR_run_functions_v2.py
>>
>> 3. At the top of LR_run_functions_v2.py, outside of the individual 
>> functions?
> 
> The latter. Python's imports are always local to the module/file they 
> are in, not globally effective.
> 
> 
> Diez
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 

-- 
====================================================
Nicholas J. Matzke
Ph.D. student, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

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"[W]hen people thought the earth was flat, they were wrong. When people 
thought the earth was spherical, they were wrong. But if you think that 
thinking the earth is spherical is just as wrong as thinking the earth 
is flat, then your view is wronger than both of them put together."

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14(1), 35-44. Fall 1989.
http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
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