bernie

你太亲密了:

usernames = []
for k,v in users.items():
    for i in v:
        for k,v in i.items():
            #       ^^^^^^^^ you were just missing one more `.items()` call
            if k == 'Username':
                usernames.append(v)

你可以这样做:

>>> logging.getLevelName(logging.getLogger().getEffectiveLevel())
'INFO'

对…的呼唤 .getEffectiveLevel() 返回级别的数字代码,然后通过相应的 .getLevelName() .