Function _common_prefix

Lib/unittest/util.py:23–31

(m)

    return s

def _common_prefix(m):
    if not m:
        return ""
    s1 = min(m)
    s2 = max(m)
    for i, c in enumerate(s1):
        if c != s2[i]:
            return s1[:i]
    return s1

def _common_shorten_repr(*args):
    args = tuple(map(safe_repr, args))