IPython not recognizing updated module

Question

I have a function in a script problem1.py:

def normal_method(target):
    a = np.array(np.arange(1,target))
    divisible_numbers = a[(a%3==0)|(a%5==0)]
    sum_value = np.sum(divisible_numbers)
    print sum_value

While calling this function in an IPython window using ,

import numpy as np
from problem1 import normal_method
%timeit normal_method(100)

It gives me TypeError saying normal_method takes no arguments. But when I paste the function into IPython and then call it using the same statement it works. Any ideas why this occurs?

As a side note: repesenting `natural_numbers` as `a` you are better off writing `divisible_numbers = a[(a%3==0) | (a%5==0)]` to avoid the for loop. — Daniel, Aug 09 '13 at 01:08
It could be the fact that `problem1.py` does not have `import numpy as np`, could be something strange with `IPython` error reporting. It would be an issue without `IPython`. — Daniel, Aug 09 '13 at 01:14
@Ophion The script has the import statement and runs fine when called from the IPython console. It is only when I import the function that it gives the error. — Nitin, Aug 09 '13 at 01:17
I cannot reproduce the issue on OSX, do you have other issues importing functions? — Daniel, Aug 09 '13 at 01:25
So I ran into another issue..if I declare a function as `def ihn(): print np.arange(5)` and I try to do `from problem1 import ihn`, it does not even acknowledge ihn. But if I do `import problem1`, then I can use ihn. Strange! — Nitin, Aug 09 '13 at 01:35

score 1 · Accepted Answer · edited May 23 '17 at 11:50

1

Your problem is that the interactive Python is not reloading the module.

Take a look here. You can try:

import problem1
problem1 = reload(problem1)
%timeit problem1.normal_method(10)

Or just run from a command prompt shell:

python test.py

With test.py containing:

import numpy as np
from problem1 import normal_method
%timeit normal_method(100)

This is more robust and should be the prefered method if you are doing multiple imports from different new modules.

edited May 23 '17 at 11:50

Community

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answered Aug 09 '13 at 10:40

Saullo G. P. Castro

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The first method works. I think you meant `%timeit problem1.normal_method(10)`. Can we use %timeit in a script? – Nitin Aug 09 '13 at 11:35
yes you are right... you can use timeit in a script, [check here for instance...](http://stackoverflow.com/q/8220801/832621) – Saullo G. P. Castro Aug 09 '13 at 12:18

score 0 · Answer 2 · answered Aug 09 '13 at 10:53

0

You do not have "import numpy as np" in the problem1.py file, so at the scope of the function definition, the ref to np is invalid, and that error may be making the definition unavailable in the caller.

Once you put the "import numpy as np" in the module file, things so=hould be all right.

answered Aug 09 '13 at 10:53

nom-mon-ir

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I have `import numpy as np` in my script. I have only posted the function in the post. It seems that there is a delay/load problem in IPython. If you restart IPython and reload the module, it works. – Nitin Aug 09 '13 at 11:37

IPython not recognizing updated module

2 Answers2