On Tue, Apr 26, 2016 at 2:07 PM, Adam Davis <peakgraph...@gmail.com> wrote:
> On Tuesday, 26 April 2016 20:52:54 UTC+1, Ian wrote:
>> On Tue, Apr 26, 2016 at 1:05 PM, Joaquin Alzola
>> <joaquin.alz...@lebara.com> wrote:
>> > Just an example. Didn't use the csv but just hope that it helps.
>> >
>> > name=[]
>> > name_exist="Dop"
>> >
>> > with open("dop.csv") as f:
>> > for line in f:
>> > line_split=line.split(',')
>> > name.append(line_strip[0])
>> > if name_exist in name:
>> > print "found name " + name_exist + " Can not append"
>> > else:
>> > file = open("dop.csv",'a')
>> > print "No name found"
>> > file.write(name_exist)
>> > file.close()
>>
>> Except that as noted elsewhere in the thread a set would be a better
>> choice than a list, since checking membership is much faster on a set.
>
> Thanks for your help Ian. I'm a beginner right now, could you instruct me as
> to how I would create a set?
Create a new set:
my_set = set()
Add a value to the set:
my_set.add(value)
Check for membership:
value in my_set
See also the Python tutorial at
https://docs.python.org/3/tutorial/datastructures.html#sets
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