Das deutsche Python-Forum

Code: Alles auswählen

def get_basename(filelist, basename=""):
    """
    Liefert die gemeinsame Basis aller Dateinamen zurück

    >>> get_basename(["abc1.txt", "abc2.txt", "abc3.txt"])
    'abc'
    >>> get_basename(["1.txt", "2.txt", "3.txt"])
    ''
    """
    first_fn = filelist[0]
    pos = len(basename)

    # nächsten Buchstaben einfügen
    new_basename = basename + first_fn[pos]

    for fn in filelist:
        if not fn.startswith(new_basename):
            # Eine Datei fängt nicht so an -> Basis gefunden
            return basename

    return get_basename(filelist, new_basename)

Code: Alles auswählen

>>> l = [ i for i in os.listdir(".") if i.endswith(".txt") ]
>>> l
['test.txt', 'test1.txt', 'test2.txt', 'test3.txt', 'test4.txt', 'test_neu.txt']
>>> os.path.commonprefix(l)
'test'
>>>

Code: Alles auswählen

def common_prefix(names):
    sorted_names = sorted(names)
    first = sorted_names[0]
    last = sorted_names[-1]
    i = 0
    try:
        while first[i] == last[i]:
            i += 1
    except IndexError:
        pass
    return first[:i]

Code: Alles auswählen

def commonprefix(m):
    "Given a list of pathnames, returns the longest common leading component"
    if not m: return ''
    s1 = min(m)
    s2 = max(m)
    n = min(len(s1), len(s2))
    for i in xrange(n):
        if s1[i] != s2[i]:
            return s1[:i]
    return s1[:n]