[Tutor] reading strings and calculating totals

[ALAN GAULD]

total = 0
>with open('/Users/richarddillon/Desktop/numbers.txt', 'r') as infile:
>   for line in infile:
>       total += float(line)
>print(total)
>
>
>Python returned         "ValueError: could not convert string to float: "
>
>That means some of your lines are not floats - are there any blanks?
You can find out by inserting a print line:

with open('/Users/richarddillon/Desktop/numbers.txt', 'r') as infile:
   for line in infile:
       print('Line = ', line)
       total += float(line)

And see what the offending line looks like.
Once you know what the error is caused by you can add a line 
or two to avoid (or handle) the problematic cases.

Alan G.
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