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How exactly does a generator comprehension work?
...>>> [x**2 for x in range(1,11)]
[1, 4, 9, 16, 25, 36, 49, 64, 81, 100]
here, range(1,11) generates the list [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], but the range function is not a generator before Python 3.0, and therefore the construct I've used is a list comprehension.
If I wanted to create a...
“Large data” work flows using pandas
..., dc = ['field_10']),
.....
REPORTING_ONLY = dict(fields = ['field_1000','field_1001',...], dc = []),
)
group_map_inverted = dict()
for g, v in group_map.items():
group_map_inverted.update(dict([ (f,g) for f in v['fields'] ]))
Reading in the files and creating the storage (essentiall...
How do the Proxy, Decorator, Adapter, and Bridge Patterns differ?
...er in intent. (strategy vs. state)
My understanding of patterns increased 100 fold after reading Head First Design Patterns.
I highly recommend it!
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Node.js - use of module.exports as a constructor
...s.area(); // 25
// or you can skip it!
var s2 = Square(10);
s2.area(); // 100
For the ES6 people
class Square {
constructor(width) {
this.width = width;
}
area() {
return Math.pow(this.width, 2);
}
}
export default Square;
Using it in ES6
import Square from "./square";
// ....
How do I remove code duplication between similar const and non-const member functions?
...This helper function can be used the following way.
struct T {
int arr[100];
int const& getElement(size_t i) const{
return arr[i];
}
int& getElement(size_t i) {
return likeConstVersion(this, &T::getElement, i);
}
};
The first argument is always the this-po...
Are soft deletes a good idea? [duplicate]
...
100
votes
I say it's a bad idea, generally (with some exceptions, perhaps).
First,...
Why is address zero used for the null pointer?
...s 0xffffffff and 0 was a perfectly valid address
– pm100
Jun 19 '17 at 22:24
add a comment
...
Why do some functions have underscores “__” before and after the function name?
...nt(" Current Balance is: ", self._money)
account = BankAccount("Hitesh", 1000, "PWD") # Object Initalization
# Method Call
account.earn_money(100)
# Show Balance
print(account.show_balance())
print("PUBLIC ACCESS:", account.name) # Public Access
# account._money is accessible because it is o...
Why is GHC so large/big?
...ompressed Size: 3,736k
Uncompressed Size: 991k
But it is still more than 100 MB, not 26 MB as you write.
Heavyweight things in ghc6 and ghc6-prof are:
$ dpkg -L ghc6 | grep '\.a$' | xargs ls -1ks | sort -k 1 -n -r | head -3
57048 /usr/lib/ghc-6.12.1/ghc-6.12.1/libHSghc-6.12.1.a
22668 /usr/lib/gh...
JavaScript OOP in NodeJS: how?
...y because mouse has one method, if it had 10 methods, 10 mice would create 100 function identities, your server would quickly waste most of its CPU on GC :P), even though you will not use them for anything. The language doesn't have enough expressive power to optimize this away currently.
...