How to search for vector in list of input arguments

[UnOrThOdOx]

Hi guys,

I am trying to write a module transfering from MATLAB. In order to avoid unnecessary errors, I do some input arguments checkings before processing. The user is allowed to put in only 3 arguments, that's why the last argument is a list instead of a fixed variable. Nevertheless, user has only 2 possibilities either he gives 3 or 4 inputs.

The point is I'd like to check if there is any vector in the list (last argument). How could I do this? Before when it was the fixed argument, I used "isvector(d )" but it is not possible to use this with a list then I get this error.

AttributeError: 'tuple' object has no attribute 'shape'

def check(a, b, c, *arg): 

if len(arg) > 1:
            raise TypeError ("Incorrect number of input arguments.")

if not isvector(b) or not isvector(arg):
            raise TypeError ("Transfer function must be specified by two vectors.")

Could someone please provide me an advice how I could go around this problem?


Thank you very much in advance
Regards

[bvdet]

You could write a separate function to check the contents of the list. Using isinstance instead of isvector and checking for a str:

>>> def isstrin(seq):
... 	for item in seq:
... 		if isinstance(item, str):
... 			return True
... 	return False
... 
>>> seq = [1,2,3,4,['a', 'b', 'c']]
>>> isstrin(seq)
False
>>> seq = [1,2,"this is a str",4,['a', 'b', 'c']]
>>> isstrin(seq)
True
>>>