Merge list items based on condition within the list

Question

I have a list of items : eg:

a = [\'IP 123 84\', \'apple\', \'mercury\', \'IP 543 65\', \'killer\', \'parser\', \'goat\',
     \'IP 549 54 pineapple\', \'dja         


        

Answer 1

Using a generator.

def merge(x, key='IP'):
    tmp = []
    for i in x:
        if (i[0:len(key)] == key) and len(tmp):
            yield ' '.join(tmp)
            tmp = []
        tmp.append(i)
    if len(tmp):
        yield ' '.join(tmp)

a = ['IP 123 84','apple','mercury','IP 543 65','killer','parser','goat','IP 549 54 pineapple','django','python']
print list(merge(a))

['IP 123 84 apple mercury', 'IP 543 65 killer parser goat', 'IP 549 54 pineapple django python']