ccdrea's recent timeline updates ccdrea's recent timeline updates | ccdreaV2EX member #248402, joined on 2017-08-13 16:21:33 +08:00 |
| 有没有数据采集，数据分析，接口开发， OA/ERP， web 开发需求的。接单了。 问与答 ccdrea Apr 26, 2019 |
ccdrea's recent replies
Apr 30, 2019 Replied to a topic by old18 Python selenium 点击的问题.请各位大佬指教一下. |
self.broswer.execute_script("arguments[0].click();",checkbox )
Apr 30, 2019 Replied to a topic by phoolean Python Python 的 list 中的元素是像 C 的数组那样在内存里顺序存放的吗？ |
>>> a = 1
>>> id(a)
1598830848
>>> b = [a]
>>> id(b)
9390640
>>> id(b[0])
1598830848
>>>
看懂了吗
>>> id(a)
1598830848
>>> b = [a]
>>> id(b)
9390640
>>> id(b[0])
1598830848
>>>
看懂了吗
Apr 30, 2019 Replied to a topic by daiqiangbudainiu Python 求教怎么能比较优雅的实现这个功能 |
补充:
from collections import OrderedDict
c = list(map(lambda x:OrderedDict(x),a))[-1]
# OrderedDict 实现一个 FIFO 得 dict
from collections import OrderedDict
c = list(map(lambda x:OrderedDict(x),a))[-1]
# OrderedDict 实现一个 FIFO 得 dict
Apr 30, 2019 Replied to a topic by daiqiangbudainiu Python 求教怎么能比较优雅的实现这个功能 |
1.
max(data, key=lambda x: int(x['label'].replace('p','')))
2.
data.sort(key=lambda x:int(x['label'].replace('p','')))
data[-1]
max(data, key=lambda x: int(x['label'].replace('p','')))
2.
data.sort(key=lambda x:int(x['label'].replace('p','')))
data[-1]
Apr 26, 2019 Replied to a topic by daiqiangbudainiu Python Scrapy 怎么能主动关闭呢？ |
去看官方文档，Extensions 这部分。https://scrapy-chs.readthedocs.io/zh_CN/0.24/topics/extensions.html
简单来说，setting 设置接收数据的信号收发标记，一段时间数据为空，自动关闭 scrapy
简单来说，setting 设置接收数据的信号收发标记，一段时间数据为空，自动关闭 scrapy
Apr 26, 2019 Replied to a topic by zhangslob669 Python 写了一个脚本，使用 pyppeteer 淘宝登录，获取 cookies |
time sleep 是同步阻塞，pypp 是异步。
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