convert a string in float but not a list of string in list of float
This is a very weird behaviour.
Suppose I have a list such
A=['1.2', '2.565', '3.45']If I I create the command A[1]=float(A[1]) the result is
A=[1.2, '2.565', '3.45']Now if I ask
for i in range(len(A)):
A[i]=float(A[i])the result is ValueError: could not convert string to float:
Do I do something forbiden ?
Please write the complete error message. What comes next is quite crucial. Probably your actual
Acontains strings with quotes or other extra characters (unlike theAyou wrote here, which is fine and does not cause any error). Or if that is really the complete error message, then yourAcontains the empty string or a string consisting only of whitespace.rburing ok I have verified there are null string on my data base. Do you know how eliminate them ?
What does this question have to do with Sage? Isn't is just a plain Python question?
Perhaps you are true, but it happens in a Sage session. From the user point of view it is often difficult to know if it is a Sage problem or a Python one. I am an economist not a computer scientist. And, more than that, rburing was true, it was not a code problem but a data problem. I want use data but I also want that the link between data and theory be the most explicit. It's the reason why I have chosen Sage.