关于import的问题

JoyDamn

#1 Created at ... [Delete] [Delete and Lock User]

我记得之前说的要尽量少用from import 多用import 所以我这次试用如下代码

import urllib
with urllib.request.urlopen('https://api.douban.com/v2/book/2129650') as f:
    data=f.read()
    print('Status',f.status,f.reason)
    for k,v in f.getheaders():
        print('{0}:{1}'.format(k,v))
    print('Data',data.decode('utf-8'))

结果报错

Traceback (most recent call last):
  File "C:\Users\focus\Desktop\python demos\urllibtest.py", line 2, in <module>
    with urllib.request.urlopen('https://api.douban.com/v2/book/2129650') as f:
AttributeError: module 'urllib' has no attribute 'request'
>>>

使用

import urllib.request
with urllib.request.urlopen('https://api.douban.com/v2/book/2129650') as f:
    data=f.read()
    print('Status',f.status,f.reason)
    for k,v in f.getheaders():
        print('{0}:{1}'.format(k,v))
    print('Data',data.decode('utf-8'))

或者

from urllib import request
with request.urlopen('https://api.douban.com/v2/book/2129650') as f:
    data=f.read()
    print('Status',f.status,f.reason)
    for k,v in f.getheaders():
        print('{0}:{1}'.format(k,v))
    print('Data',data.decode('utf-8'))

都没问题，想问问老师为什么会这样。。。