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使用App Inventor扩展实现多点触控：Scale Detector · App Inventor 2 中文网
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使用App Inventor扩展实现多点触控：Scale Detector
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草稿（9 月 13 日）：构建扩展需要 App Inventor Extensions 功能，该功能尚未合并到 App Inventor 版本中。 但是你可以使用...
What to do about Eclipse's “No repository found containing: …” error messages?
...be OK.
At least this trick resolved my problems similar like this:
An error occurred while collecting items to be installed session
context was:(profile=epp.package.jee,
phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=,
action=). No repository found containing:
osgi...
Catching an exception while using a Python 'with' statement
... with open( "a.txt" ) as f :
print f.readlines()
except EnvironmentError: # parent of IOError, OSError *and* WindowsError where available
print 'oops'
If you want different handling for errors from the open call vs the working code you could do:
try:
f = open('foo.txt')
except IOE...
How to get the position of a character in Python?
...the search string isn't found. find() returns -1 and index() raises ValueError.
Using find()
>>> myString = 'Position of a character'
>>> myString.find('s')
2
>>> myString.find('x')
-1
Using index()
>>> myString = 'Position of a character'
>>> my...
How do I use grep to search the current directory for all files having the a string “hello” yet disp
...
grep -l hello **/*.{h,cc}
You might want to shopt -s nullglob to avoid error messages if there are no .h or no .cc files.
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error LNK2019: unresolved external symbol _WinMain@16 referenced in function ___tmainCRTStartup
While I am running the simple code as below I have two errors as following:
13 Answers
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Catching multiple exception types in one catch block
I'd like a cleaner way to obtain the following functionality, to catch AError and BError in one block:
11 Answers
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Twitter bootstrap float div right
What is the proper way in bootstrap to float a div to the right? I thought pull-right was the recommend way, but it is not working.
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Is it possible to break a long line to multiple lines in Python [duplicate]
...ltiple short lines. But in Python , if I do this, there will be an indent error... Is it possible?
7 Answers
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Efficient method to generate UUID String in JAVA (UUID.randomUUID().toString() without the dashes)
...ither that it's 10-20x faster (cowtowncoder.com/blog/archives/2010/10/entry_429.html); or that they don't trust randomness to produce unique ids (which is kinda funny)
– StaxMan
Oct 24 '10 at 3:30
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