reader.py 文件源码

def _make_unctrl_map():
    uc_map = {}
    for c in map(unichr, range(256)):
        if unicodedata.category(c)[0] != 'C':
            uc_map[c] = c
    for i in range(32):
        c = unichr(i)
        uc_map[c] = '^' + unichr(ord('A') + i - 1)
    uc_map[b'\t'] = '    '  # display TABs as 4 characters
    uc_map[b'\177'] = unicode('^?')
    for i in range(256):
        c = unichr(i)
        if c not in uc_map:
            uc_map[c] = unicode('\\%03o') % i
    return uc_map