字符串被解释为bool？

Question

我正在尝试在继续我的程序之前找到密码的长度，但是python一直在告诉我，我正在尝试计算一个bool的长度：

$ perl -E'
   my $class = "".[];
   say $class;
   my $o = bless({}, $class);
   say ref($o);
'
ARRAY(0x115e360)
ARRAY(0x115e360)

回溯：

input_name = input('\nWe need you name: ')

if input_name in members:

    while True:
        input_pass = input('Input your password: ')
        if len(input_pass == 0):
            print("Can't be null!")
            continue
        else: break 

else:

    print('Sorry, your not part of the League.')
    bin_1 = input('Would you like to join?')