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What's the difference between eval, exec, and compile?
... call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1
a = 47
^
SyntaxError: invalid syntax
The compile in 'exec' mode compiles any number of statements into a bytecode that implicitly always returns None, whereas in 'eval' mode it compiles a sin...
What is the difference between “text” and new String(“text”)?
...
new String("text");
explicitly creates a new and referentially distinct instance of a String object; String s = "text"; may reuse an instance from the string constant pool if one is available.
You very rarely would ever want to ...
How to print a dictionary line by line in Python?
...s function in this module converts a JSON object into a properly formatted string which you can then print.
import json
cars = {'A':{'speed':70, 'color':2},
'B':{'speed':60, 'color':3}}
print(json.dumps(cars, indent = 4))
The output looks like
{
"A": {
"color": 2,
"...
How to use Regular Expressions (Regex) in Microsoft Excel both in-cell and loops
...not be present but can only be matched one time.
E.g. [a-z]? matches empty string or any single lower case letter.
* Match zero or more of the pattern defined before it.
- E.g. Wildcard for pattern that may or may not be present.
- E.g. [a-z]* matches empty string or string of lower case letter...
Deciding between HttpClient and WebClient
... result = responseTask.Result;
var readTask = result.Content.ReadAsStringAsync().Result;
}
private void CallGetHttpClient()
{
var httpClient = new HttpClient();
httpClient.BaseAddress = new Uri("https://localhost:44354/api/test/");
var responseTask = http...
Is it possible to use getters/setters in interface definition?
...r getters and setters are used, like this:
interface IExample {
Name: string;
}
class Example implements IExample {
private _name: string = "Bob";
public get Name() {
return this._name;
}
public set Name(value) {
this._name = value;
}
}
var example = new ...
Find MongoDB records where array field is not empty
...ll of my records have a field called "pictures". This field is an array of strings.
11 Answers
...
How can I find script's directory with Python? [duplicate]
...ehaviour as, that python command does not exist within a file but inside a string which you pass to the interpreter
– Har
Apr 14 '15 at 8:15
...
Difference between JSON.stringify and JSON.parse
...
JSON.stringify turns a JavaScript object into JSON text and stores that JSON text in a string, eg:
var my_object = { key_1: "some text", key_2: true, key_3: 5 };
var object_as_string = JSON.stringify(my_object);
// "{"key_1":"...
How to check 'undefined' value in jQuery
...platform:
if (typeof value === "undefined") {
// ...
}
It returns a string indicating the type of the variable or other unevaluated operand. The main advantage of this method, compared to if (value === undefined) { ... }, is that typeof will never raise an exception in case if variable value ...