Python parse empty string

Python parse empty string

By : Tomas Flores Urrutia
Date : November 22 2020, 10:31 AM
it helps some times I'm using the parse library and ran into surprising (to me) functionality: it does not match empty strings: , Use a custom type conversion:
code :
from parse import parse
def zero_or_more_string(text):
    return text

zero_or_more_string.pattern = r".*"
parse('hi "{:z}"', 'hi ""', { "z": zero_or_more_string })
<Result ('',) {}>

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How do I parse this json string using GSON correctly. JsonObject is returning empty with no parse errors

How do I parse this json string using GSON correctly. JsonObject is returning empty with no parse errors

By : user3110225
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Here's an approach that works with the JSON input you provided, but more "fully" deserializes into a friendly data structure.
The output is
code :
[ContainerData: success=true, reason=null, testString=some string, data=[Data: networks=[
[Network: networkId=1, networkName=some area, networkType=1], 
[Network: networkId=4, networkName=another place, networkType=1]
public class Foo
  static String jsonInput = 
    "{" + 
      "\"testString\":\"some string\"," + 
      "\"success\":true," + 
      "\"reason\":null," + 
      "\"data\":" + 
      "{" + 
        "\"networks\":" + 
        "[" + 
          "{\"networkId\":\"1\",\"networkName\":\"some area\",\"networkType\":1}," + 
          "{\"networkId\":\"4\",\"networkName\":\"another place\",\"networkType\":1}" + 
        "]" + 
      "}" + 

  public static void main(String[] args)
    GsonBuilder gsonBuilder = new GsonBuilder();
    Gson gson = gsonBuilder.create();
    ContainerData container = gson.fromJson(jsonInput, ContainerData.class);

class ContainerData
  private boolean success;
  private String reason;
  private String testString;
  private Data data;

  public String toString()
    return String.format(
        "[ContainerData: success=%1$b, reason=%2$s, testString=%3$s, data=%4$s]", 
        success, reason, testString, data);

class Data
  private Network[] networks;

  public String toString()
    return String.format(
        "[Data: networks=%1$s]", 

class Network
  private String networkId;
  private String networkName;
  private int networkType;

  public String toString()
    return String.format(
        "[Network: networkId=%1$s, networkName=%2$s, networkType=%3$d]",
        networkId, networkName, networkType);
parse string into double getting error java.lang.NumberFormatException: empty String

parse string into double getting error java.lang.NumberFormatException: empty String

By : toni
Date : March 29 2020, 07:55 AM
Any of those help Double.toString(Double.parseDouble(suggestionSortScore) - 6) -- will through an exception only when string suggestionSortScore does not contain a parsable double
parse a string till an empty space to form a list in python

parse a string till an empty space to form a list in python

By : Jyothsna.N.S.
Date : March 29 2020, 07:55 AM
To fix this issue Convert the string to a list and use list operations to slice the string at the empty string:
code :
>>> s = "['col1', 'col2', 'col3','', 'row1', 'row2']"
>>> import ast
>>> L = ast.literal_eval(s)
>>> L
['col1', 'col2', 'col3', '', 'row1', 'row2']
>>> L.index('')
>>> L[:L.index('')]
['col1', 'col2', 'col3']
Parse a json string from url and store it in empty string

Parse a json string from url and store it in empty string

By : Martin Krakowski
Date : March 29 2020, 07:55 AM
I wish this helpful for you You are printing the jsonStr while the content you want is the data.
AyncTasks runs async, meaning that code runs paralalel: check this simple sample for better undestanding.
code :
String b = "s"; 
void onCreate(Bundle b) {
   new Task().execute();

void afterAsyncHere() {
   Log.e("onCreate", b);

class Task extends AsyncTask {
    Object doInBackground(Object ... args) {
        b ="value b";
        try { Thread.sleep(1000); }catch(Exception e) {}
    void onPostExecute(Object r) {
  String ad =  dataa.getString("bnl");
  data = ad;
  Log.e(TAG, "Response.data from url: " + data);
public class MainActivity extends ActionBarActivity {

DataBaseHandler db;
private AlertDialog dialog;
public static final int IntialQteOfDayId = 8;

final Context context = this;
SharedPreferences preferences;
private static final int RESULT_SETTINGS = 1;
// This string will hold the results
String data = "";
private String TAG = MainActivity.class.getSimpleName();

private ProgressDialog pDialog;
// URL to get contacts JSON
private static String url = "https://yourdomain.com/test.json";
protected void onCreate(Bundle savedInstanceState) {
    new GetAd().execute();


void startTheThingWithData(){
   //Here data has value
   Log.e(data, data);
 * Async task class to get json by making HTTP call
private class GetAd extends AsyncTask<Void, Void, Void> {

protected void onPreExecute() {
    // Showing progress dialog
    pDialog = new ProgressDialog(MainActivity.this);
    pDialog.setMessage("Please wait...");


protected Void doInBackground(Void... arg0) {
    HttpHandler sh = new HttpHandler();

    // Making a request to url and getting response
    String jsonStr = sh.makeServiceCall(url);

    Log.e(TAG, "Response from url: " + jsonStr);

    if (jsonStr != null) {
        try {
            JSONObject jsonObj = new JSONObject(jsonStr);
            JSONObject dataa = jsonObj.getJSONObject("main1");
              String ad =  dataa.getString("bnl");
            data = ad;

        } catch (final JSONException e) {
            Log.e(TAG, "Json parsing error: " + e.getMessage());
            runOnUiThread(new Runnable() {
                public void run() {
                            "Json parsing error: " + e.getMessage(),

    } else {
        Log.e(TAG, "Couldn't get json from server.");
        runOnUiThread(new Runnable() {
            public void run() {
                        "Couldn't get json from server. Check LogCat for possible errors!",


    return null;

protected void onPostExecute(Void result) {
    // Dismiss the progress dialog
    if (pDialog.isShowing())
Parse a empty string into SimpleDateFormat

Parse a empty string into SimpleDateFormat

By : Veeru
Date : March 29 2020, 07:55 AM
To fix the issue you can do The javadoc for parse states: "Throws: ParseException - if the beginning of the specified string cannot be parsed."
The string "" cannot be parsed, and thus a ParseException is thrown.
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