Convert [Key1,Val1,Key2,Val2] to a Dict

Convert [key1,val1,key2,val2] to a dict?

b = dict(zip(a[::2], a[1::2]))

If a is large, you will probably want to do something like the following, which doesn't make any temporary lists like the above.

from itertools import izip
i = iter(a)
b = dict(izip(i, i))

In Python 3 you could also use a dict comprehension, but ironically I think the simplest way to do it will be with range() and len(), which would normally be a code smell.

b = {a[i]: a[i+1] for i in range(0, len(a), 2)}

So the iter()/izip() method is still probably the most Pythonic in Python 3, although as EOL notes in a comment, zip() is already lazy in Python 3 so you don't need izip().

i = iter(a)
b = dict(zip(i, i))

In Python 3.8 and later you can write this on one line using the "walrus" operator (:=):

b = dict(zip(i := iter(a), i))

Otherwise you'd need to use a semicolon to get it on one line.

Convert list pairwise to dictionaries?

zip and a list comprehension are the way to go:

>>> a = ["a","b","c","d","e","f"]
>>> [{'key': k, 'value': v} for k, v in zip(a[::2], a[1::2])]
[{'value': 'b', 'key': 'a'}, {'value': 'd', 'key': 'c'}, {'value': 'f', 'key': 'e'}]

Notice how the list is sliced with a step of two starting at 0 and 1 and then zipped.

Covert String to Key-Value Pair or JSON in dart

Okay, this is just a fast horrible hacky solution which can with high probability be improved. But I hope it gets closer to a solution for you:

import 'dart:convert';

void main() {
  var str =
      "[{key1: 0.1, key2: 0.2}, {key1: 0.3, key2: 0.4}, {key1: 0.5, key2: 0.6}]";

  str = str.replaceAll(' ', '').replaceAllMapped(
      RegExp(r'([\{,])([a-zA-Z0-9]+)(:)'),
      (match) => '${match[1]}"${match[2]}"${match[3]}');
  
  print(str);
  // [{"key1":0.1,"key2":0.2},{"key1":0.3,"key2":0.4},{"key1":0.5,"key2":0.6}]

  final jsonObject = jsonDecode(str) as List<dynamic>;
  jsonObject.forEach(print);
  // {key1: 0.1, key2: 0.2}
  // {key1: 0.3, key2: 0.4}
  // {key1: 0.5, key2: 0.6}
}

Convert string with alternating key value pairs to a dictionary

Simple answer.

a = "key1\\val1\\key2\\val2\\key3\\val3"
b = a.split('\\')
dc = {}
for i in range(0,len(b), 2):
    dc[b[i]]=b[i+1]

convert string to dictionary in swift 5?

you may have to do it the hard way. Something like this:

import SwiftUI

@main
struct TestApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

extension String {
    func trim() -> String {
        return self.trimmingCharacters(in: .whitespacesAndNewlines)
    }
}

struct ContentView: View {
    var body: some View {
        Text("testing")
            .onAppear {
                let myString: String = "{key1: val1, key2: val2, key3: val3}"
                let myJson = transform(myString)
                print("----> myJson: \(myJson)")
            }
    }
    
    func transform(_ myString: String) -> [String : String] {
        var result = [String : String]()
        if myString.count > 2 { // case of {}
            let temp1 = myString.dropFirst().dropLast()
            let temp2 = temp1.split(separator: ",").map{String($0)}
            for str in temp2 {
                let temp3 = str.split(separator: ":").map{String($0)}
                let (k,v) = (temp3[0].trim(),temp3[1].trim())
                result[k] = v
            }
        }
        return result
    }
}

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