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关于App Inventor 2颜色积木，社区里追问最多的8个问题 - App应用开发 - 清...
...找到"合成颜色"块，拖出来，往里面塞一个包含RGB或RGBA值的列表就行。比如列表[255, 0, 0]就是纯红，[0, 255, 0]是纯绿。
方法二：知道颜色数字直接填。 App Inventor 2内部把颜色存成一个整数——比如红色是-65536。如果你在...
How to replace multiple substrings of a string?
...atest versions
pattern = re.compile("|".join(rep.keys()))
text = pattern.sub(lambda m: rep[re.escape(m.group(0))], text)
For example:
>>> pattern.sub(lambda m: rep[re.escape(m.group(0))], "(condition1) and --condition2--")
'() and --text--'
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Defining private module functions in python
...cores (w/o trailing underscores) carry the message even more forcefully... but, in the end, it still depends on social convention and consensus: Python's introspection is forceful enough that you can't handcuff every other programmer in the world to respect your wishes.
((Btw, though it's a closely...
Entity Framework: There is already an open DataReader associated with this Command
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It is not about closing connection. EF manages connection correctly. My understanding of this problem is that there are multiple data retrieval commands executed on single connection (or single command with multiple selects) while next ...
What port is a given program using? [closed]
I want to be able to figure out what port a particular program is using. Are there any programs available online or that come with windows that will tell me which processes are using which ports on my computer?
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Rails formatting date
...n strftime method:
Date (Year, Month, Day):
%Y - Year with century (can be negative, 4 digits at least)
-0001, 0000, 1995, 2009, 14292, etc.
%C - year / 100 (round down. 20 in 2009)
%y - year % 100 (00..99)
%m - Month of the year, zero-padded (01..12)
%_m blank-padded...
Batch files - number of command line arguments
Just converting some shell scripts into batch files and there is one thing I can't seem to find...and that is a simple count of the number of command line arguments.
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How to use a variable for a key in a JavaScript object literal?
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{ thetop : 10 } is a valid object literal. The code will create an object with a property named thetop that has a value of 10. Both the following are the same:
obj = { thetop : 10 };
obj = { "thetop" : 10 };
In ES5 and earlier, you cannot use a var...
Why use Ruby's attr_accessor, attr_reader and attr_writer?
Ruby has this handy and convenient way to share instance variables by using keys like
5 Answers
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Can't start Eclipse - Java was started but returned exit code=13
...et my first taste of Android development using Eclipse. I ran into this problem when trying to run Eclipse, having installed version 4.2 only minutes ago.
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