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 Tuesday, January 16, 2007

Python - Merge a Sequence of Lists Into a Single List

the function:

def merge(seq):
    merged = []
    for s in seq:
        for x in s:
            merged.append(x)
    return merged


sample usage:

foo = [['a', 'b'],['c'],['d', 'e', 'f']]
print merge(foo)

>>>['a', 'b', 'c', 'd', 'e', 'f']

Update:
Here is another implementation that uses a Python dictionary. This version merges the lists and only keeps unique entries. 

def merge(seq):
    d = {}
    for s in seq:
        for x in s:
            d[x] = 1
    return d.keys()
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