line[:-1]和split(',')

x = '111,222,333,444\n'
print(x)
users = [ ]

print(x[:-1])
print('-----------------------------------------------')
print(x[:-1].split(','))
print('-----------------------------------------------')

for line in x[:-1].split(','):
    print(line)
    users.append(line)

print('-----------------------------------------------')
print(type(users))
print(users)
print(len(users))
print(users[0])

 

执行结果：

111,222,333,444

111,222,333,444
-----------------------------------------------
['111', '222', '333', '444']
-----------------------------------------------
111
222
333
444
-----------------------------------------------
<class 'list'>
['111', '222', '333', '444']
4
111