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How to delete duplicates on a MySQL table?
...ice: this would keep the oldest duplicate record and would erase the newer ones. If you want to keep the newest you cannot do this with ALTER IGNORE.
– Haralan Dobrev
Oct 1 '12 at 10:26
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Check list of words in another string [duplicate]
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if any(word in 'some one long two phrase three' for word in list_):
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Switch statement fallthrough in C#?
Switch statement fallthrough is one of my personal major reasons for loving switch vs. if/else if constructs. An example is in order here:
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How can I initialize a C# List in the same line I declare it. (IEnumerable string Collection Example
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var list = new List<string> { "One", "Two", "Three" };
Essentially the syntax is:
new List<Type> { Instance1, Instance2, Instance3 };
Which is translated by the compiler as
List<string> list = new List<string>();
list.Add("One");
li...
What does the [Flags] Enum Attribute mean in C#?
...s powers of two. If you omit the numeric values, the enum will not work as one might expect in bitwise operations, because by default the values start with 0 and increment.
Incorrect declaration:
[Flags]
public enum MyColors
{
Yellow, // 0
Green, // 1
Red, // 2
Blue // ...
how to concatenate two dictionaries to create a new one in Python? [duplicate]
....93 usec per loop
Fastest: exploit the dict constructor to the hilt, then one update:
$ python -mtimeit -s'd1={1:2,3:4}; d2={5:6,7:9}; d3={10:8,13:22}' \
'd4 = dict(d1, **d2); d4.update(d3)'
1000000 loops, best of 3: 1.88 usec per loop
Middling: a loop of update calls on an initially-empty dict:...
Locking pattern for proper use of .NET MemoryCache
...chedString;
}
lock (cacheLock)
{
//Check to see if anyone wrote to the cache while we where waiting our turn to write the new value.
cachedString = MemoryCache.Default.Get(CacheKey, null) as string;
if (cachedString != null)
{
return cachedSt...
Accessing inactive union member and undefined behavior?
...s under the impression that accessing a union member other than the last one set is UB, but I can't seem to find a solid reference (other than answers claiming it's UB but without any support from the standard).
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Regular expression to check if password is “8 characters including 1 uppercase letter, 1 special cha
...xpressions.
I think it would be easier to break your regex down and do it one bit at a time. It might take a bit more to do, but I am pretty sure that maintaining it and debugging it would be easier. This would also allow you to provide more directed error messages to your users (other than just In...
What does if __name__ == “__main__”: do?
...variables are set up, the interpreter executes all the code in the module, one statement at a time. You may want to open another window on the side with the code sample so you can follow along with this explanation.
Always
It prints the string "before import" (without quotes).
It loads the math mo...