Turning A List Of Strings Into Float

I printed some data from an external file and split the data into a string: string = data splitstring = string.split(',') print(splitstring) which gave me: ['500', '500', '0.5', '

Solution 1:

Use a list comprehension:

splitstring = [float(s) for s in splitstring]

or, on Python 2, for speed, use map():

splitstring = map(float, splitstring)

When you loop over a list in Python, you don't get indexes, you get the values themselves, so c is not an integer but a string value ('500' in the first iteration).

You'd have to use enumerate() to generate indices for you, together with the actual values:

for i, value in enumerate(splitstring):
    splitstring[i] = float(value)

or use for c in range(len(splitstring)): to only produce indices. But the list comprehension and map() options are better anyway.