如何从列表字典中选择唯一元素

Question

I had a dictionary of lists and I need to select unique elements out of all lists by dropping elements in lists if it repeats for the 2nd,3rd and so on.. times and preserving only for the first time it comes. my data:

dicti={'a':['video@vermont.org'.,'nr@context'],
'b':['vermont@vermont.org','nr@id'],
'c':['nr@context''vermont@vermont.org']}

my code which I tried

checker=list()
for key in emails:
    for emailid in emails[key]:
        if emailid in checker:
            del(emailid)
        else:
            checker.append(emailid)

Answer 1

Keeping the spirit of the original code:

checker=set()
for key in emails:
    value = list()
    for emailid in emails[key]:
       if emailid not in checker:
           checker.add(emailid)
           value.append(emailid)
    emails[key] = value

Answer 2

Instead of deleting why don't you fetch what you need from data ?

dicti={'a':['video@vermont.org','nr@context'],
'b':['vermont@vermont.org','nr@id'],
'c':['nr@context','vermont@vermont.org']}

track=[]
for key,value in dicti.items():
    for item in value:
        if item not in track:
            track.append(item)
print(track)

output:

['vermont@vermont.org', 'nr@id', 'nr@context', 'video@vermont.org']