human
Complete the below
def countedArray(expr, intExpr=None):

    ''''Helper to define a counted list of expressions.
    This helper defines a pattern of the form::
    integer expr expr expr...
    where the leading integer tells how many expr expressions follow.
    The matched tokens returns the array of expr tokens as a list - the leading count token is suppressed.'
    '''
assistant
#Here is the Python code you requested.
    arrayExpr = Forward()
    def countFieldParseAction(s, l, t):
        n = t[0]
        (arrayExpr << ((n and Group(And(([expr] * n)))) or Group(empty)))
        return []
    if (intExpr is None):
        intExpr = Word(nums).setParseAction((lambda t: int(t[0])))
    else:
        intExpr = intExpr.copy()
    intExpr.setName('arrayLen')
    intExpr.addParseAction(countFieldParseAction, callDuringTry=True)
    return (intExpr + arrayExpr).setName((('(len)    ' + _ustr(expr)) + '...'))