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Django ModelForm: What is save(commit=False) used for?
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As a "real example", consider a user model where the email address and the username are always the same, and then you could overwrite your ModelForm's save method like:
class UserForm(forms.ModelForm):
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def save(self):
# Sets username to email before saving
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MQTT报文多个数据的提取 - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
...怎么把MQTT发来的消息保存成JOSN的文本 让我下面可以索引JOSN的文本，实在不好意思 ，我是小白，有点不好理解
dou454 发表于 2026-03-11 08:40
现在问题不在提取数据了，是订阅MQTT消息，怎么把MQTT发来的消息保存成JOSN的文...
Determining 32 vs 64 bit in C++
..., but was curious to know if people could think of cases where this might fail or if there is a better way to do this. Please note we are trying to do this in a cross-platform, multiple compiler environment.
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Regular expression to match DNS hostname or IP Address?
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Here: stackoverflow.com/questions/4645126/… - I explain that names that start with a digit are considered as valid as well. Also, only one dot is questionable issue. Would be great to have more feedback on that.
– BreakPhreak
Jan 10 '11 a...
苦逼的年轻人和年薪百万的区别到底在哪里？ - 杂谈 - 清泛网 - 专注C/C++及内核技术
...汽水啤酒，应有尽有，全是昂贵的品牌。
开放式厨房里可以磨咖啡，水果放在精致小篮子里。一切摆设都费了心思，不突兀，处处是美感。
最重要的是，一切都免费，随便拿。
这是茶水间。
办公区全是苹果电脑，忽然穿插...
What is the best way to do a substring in a batch file?
... - expands %I to a file extension only
%~sI - expanded path contains short names only
%~aI - expands %I to file attributes of file
%~tI - expands %I to date/time of file
%~zI - expands %I to size of file
%~$PATH:I - searches the directories listed in the PATH
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Regular expression for first and last name
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Your regex fail on 2 characters string. I think this fixed it ^[\w'\-,.]*[^_!¡?÷?¿\/\\+=@#$%ˆ&*(){}|~<>;:[\]]*$
– TKA
Aug 8 '19 at 19:23
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Data structure for loaded dice?
..., r and s, between 0 and 1. Let i = floor(r*N)+1. If qi < s then return ai else return bi. The work in the alias method is in figuring out how to produce qk, ak and bk.
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全食超市（Whole Foods Market）——精品超市的运营之道 - 资讯 - 清泛网 -...
...要求来自于生态良好的有机农业生产体系生产和加工，不使用化学农药、化肥、化学防腐剂等合成物质。有机动物产品则表示其在饲养过程中采用100%有机饲料，没有被使用过促生长激素或抗生素，并且有充足的户外活动空间。...
Can a Windows batch file determine its own file name?
... - expands %I to a file extension only
%~sI - expanded path contains short names only
%~aI - expands %I to file attributes of file
%~tI - expands %I to date/time of file
%~zI - expands %I to size of file
%~$PATH:I - searches the directories listed in the PATH
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