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How to use 'merge multiple csv files into one python' in Python

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11def merge(columns, files):
12    #first read all csv files to an 3-dim array raw-csv[file][line][column]
13    raw_csv = []
14    for f in files:
15        csv_arr=[]
16        for line in file(f).readlines():
17            csv_arr.append([elem.strip() for elem in line.split(",")])
18        raw_csv.append(csv_arr)
19
20    #now create new file
21    result = []
22    for bench_index in xrange(len(raw_csv[0])):
23        for f in xrange(len(files)):
24            result.append(", ".join(raw_csv[f][bench_index]))
25        result.extend(["",""])
26
27    return "\n".join(result)

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