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df['x'] = df['latitude'].values + df['longitude'].values

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# l is a list of dictionaries, of the form [{...},{...}]
for o in l:
  o['distance'] = o['latitude'] + o['longitude']

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# summation on a dataframe
df['x'] = df['latitude'].values + df['longitude'].values

# summation on a list of dictionaries, of the form [{...},{...}]
for o in l:
  o['distance'] = o['latitude'] + o['longitude']

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# DataFrame Optimised Haversine function
def haversine(lat1, lon1, lat2, lon2):
  miles_constant = 3959
  lat1, lon1, lat2, lon2 = map(np.deg2rad, [lat1, lon1, lat2, lon2])
  dlat = lat2 - lat1
  dlon = lon2 - lon1
  a = np.sin(dlat/2)**2 + np.cos(lat1) * np.cos(lat2) * np.sin(dlon/2)**2
  c = 2 * np.arcsin(np.sqrt(a))
  mi = miles_constant * c
  return mi

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# List Optimised Haversine function
def haversine(lat1, lon1, lat2, lon2):
  miles_constant = 3959
  lat1, lon1, lat2, lon2 = map(math.radians, [lat1, lon1, lat2, lon2])
  dlat = lat2 - lat1
  dlon = lon2 - lon1
  a = math.sin(dlat/2)**2 + math.cos(lat1) * math.cos(lat2) * math.sin(dlon/2)**2
  c = 2 * math.asin(math.sqrt(a))
  mi = miles_constant * c
  return mi

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import 'package:flutter/material.dart';

import 'camera.dart';
import 'gallery.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(MyApp());
}

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Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(MyApp());
}

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class Gallery extends StatefulWidget {
  @override
  _GalleryState createState() => _GalleryState();
}

class _GalleryState extends State<Gallery> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(

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import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:camera/camera.dart';
import 'package:permission_handler/permission_handler.dart';

import 'camera.dart';

class Camera extends StatefulWidget {
  final loadingWidget;
  Camera(this.loadingWidget);

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  Future<void> setupCamera() async {
    await [
      Permission.camera,
    ].request();
    _cameras = await availableCameras();
    var controller = await selectCamera();
    setState(() => _controller = controller);
  }