I`ve been trying to convert a string numbers list into float and get the max of this list but I keep getting this error:
ValueError: could not convert string to float: '.'
My attempt was to get a list like ls = ['1','2','3','0.5'] and convert using this function
def convert_to_int(ls: list):
values = [float(a) for a in ls]
return (len(values), values)
print(max(ls, key=convert_to_int))
Why I'm having this error? Can someone help me?
I think, what you're looking for is:
max(ls, key=float)
output: '3'
This will get the max value of your string list, using a temporary float conversion within max
There is a more straight way to do this.
ls = ['1','2','3','0.5']
res = max(map(float, ls))
print(res)
Output:
3.0
Using convert_to_int and ls from the question:
def convert_to_int(ls: list):
values = [float(a) for a in ls]
return (len(values), values)
ls = ['1','2','3','0.5']
print(max(*convert_to_int(ls)[1]))
3.0
keyshould be a function which applies to individual elements, not to lists of elements. Also -- why are you calling a function designed to covert to floatsconvert_to_int?max(convert_to_int(ls)[1])?