def METHOD_NAME(self, s):
    """
    Load the next string (i.e. text in quotation marks) from
    the given line 's'.
    """
    n = len(s)
    # Locate beginning quotation mark
    i = 0
    while i < n and s[i] != '"': i += 1
    if i == n:
        return None, None
    # Load string
    i += 1
    j = 0
    while i+j < n and s[i+j] != '"' and s[i+j-1] != '\\':
        j += 1
    S = s[i:(i+j)]
    return S, i+j+1