On Thu, Mar 10, 2016 at 4:05 PM, BartC <b...@freeuk.com> wrote:
> Here's a rather un-Pythonic and clunky version. But it gives the expected
> results. (I've dispensed with file input, but that can easily be added
> back.)
>
> def last(a):
> return a[-1]
>
> def init(a): # all except last element
> return a[0:len(a)-1]
>
> data =["BANANA FRIES 12", # 1+ items/line, last must be numeric
> "POTATO CHIPS 30",
> "APPLE JUICE 10",
> "CANDY 5",
> "APPLE JUICE 10",
> "CANDY 5",
> "CANDY 5",
> "CANDY 5",
> "POTATO CHIPS 30"]
>
> names = [] # serve as key/value sets
> totals = []
>
> for line in data: # banana fries 12
> parts = line.split(" ") # ['banana','fries','12']
> value = int(last(parts)) # 12
> name = " ".join(init(parts)) # 'banana fries'
>
This could be written as (untested):
name, value = line.rsplit(' ', 1) # line.rsplit(maxsplit=1) should also work
value = int(value)
No need to rejoin the string this way.
See also: https://docs.python.org/3.5/library/stdtypes.html#str.rsplit
> try:
> n = names.index(name) # update existing entry
> totals[n] += value
> except:
> names.append(name) # new entry
> totals.append(value)
>
> for i in range(len(names)):
> print (names[i],totals[i])
>
Chris
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