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Python: Get the first character of the first string in a list?
...rap your head around the two conflicting worlds of Python's "list slicing, indexing, subsetting" and then Numpy's "masking, slicing, subsetting, indexing, then numpy's enhanced fancy indexing".
These two videos cleared things up for me:
"Losing your Loops, Fast Numerical Computing with NumPy" by P...
What is a NullPointerException, and how do I fix it?
...ng usually happens when using . to access a method or field, or using [ to index an array.
If you attempt to dereference num BEFORE creating the object you get a NullPointerException. In the most trivial cases, the compiler will catch the problem and let you know that "num may not have been initiali...
Check if list contains element that contains a string and get that element
...t[i].Contains(myString)) // (you use the word "contains". either equals or indexof might be appropriate)
{
return i;
}
}
Old fashion loops are almost always the fastest.
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How to grep (search) committed code in the Git history
...d, or changed.
Take this commit as an example:
diff --git a/test b/test
index dddc242..60a8ba6 100644
--- a/test
+++ b/test
@@ -1 +1 @@
-hello hello
+hello goodbye hello
Because the number of times "hello" appears in the file is the same before and after this commit, it will not match using -Sh...
INSERT with SELECT
...s have different character sets on the same table column (which can potentially lead to data loss if not handled properly).
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Get url parameters from a string in .NET
...energy+edge&rls=com.microsoft:en-au&ie=UTF-8&oe=UTF-8&startIndex=&startPage=1%22",
new Dictionary<string, string>
{
{ "q", "energy+edge" },
{ "rls", "com.microsoft:en-au" },
{ "ie", "UTF-8" },
...
How can I set NODE_ENV=production on Windows?
...=production&&npm start
or
set NODE_ENV=production&&node index.js
The trick for it to work on Windows is you need to remove the whitespace before and after the "&&". Configured your package.json file with start_windows (see below) below. Then Run "npm run start_windows" at...
Create array of regex matches
...));
}
(if you have more capturing groups, you can refer to them by their index as an argument of the group method. If you need an array, then use list.toArray())
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How to use Session attributes in Spring-mvc
...
@Autowired
private User user
5.Pass HttpSession to method:
String index(HttpSession session) {
session.setAttribute("mySessionAttribute", "someValue");
return "index";
}
6.Make ModelAttribute in session By @SessionAttributes("ShoppingCart"):
public Strin...
How do I prevent Eclipse from hanging on startup?
...SPACE_DIR/.metadata/.plugins/org.eclipse.core.resources/.projects \
-name .indexes -exec rm -fr {} \;
That did the trick.
Initially I thought it was a problem with Mylyn (I experienced these freezes after I started using its generic web connector), but the problem appeared even after uninstalling...