Databases
StackOverflow2013
Postsdbo
POPython: Dictionary-Deleting keys having default values
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POPython: Dictionary-Deleting keys having default values
    primarykey
    data
    text
    <p>I am working on a dataset and for the same a lot of data being processed is stored in dictionary. A lot many of the keys are getting updated as data is getting processed.</p> <p>To avoid checking the existence of keys at every level I have opted to create the structure in a static manner where I load the values of the key with default values.</p> <p>Example:</p> <pre><code>Student : { "Name" : "", "Exam" : { "Math" : {"Marks_Obtained" : 0, "Total_Question" : 100, .... some more keys } } } </code></pre> <p>Now when I encounter another exam stat say "English" to avoid the check operation of whether the key exists I preconfigure the structure with default values. So now my struct will look somethg like this.</p> <pre><code>Student : { "Name" : "", "Exam" : { "Math" : {"Marks_Obtained" : 0, "Total_Question" : 100, .... some more keys }, "Eng" : {"Marks_Obtained" : 0, "Total_Question" : 100, .... some more keys }, "Hist" : {"Marks_Obtained" : 0, "Total_Question" : 100, .... some more keys }, "Bio" : {"Marks_Obtained" : 0, "Total_Question" : 100, .... some more keys } } } </code></pre> <p>Now some students might not opt for an exam. I want to delete that entire structure. Say the student didnt opt for History I want to delete (del["Exam"]["Hist"]).</p> <p>I dont want to dynamically generate the structure as values are getting updated quite frequently for the exam the user gave, and checking the validity of the structure for every iteration would mean an additional O(1) process.</p> <p>What I wish to do is efficiently delete the keys which were not used. I dont want to loop using a for loop as that would be again be an inefficient way. </p> <p>If there are any doubts feel free to comment.</p> <p>Let me know your thoughts! </p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USmeagar
    1. USAnkit Solanki
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. COIt sounds like you're trying to optimize something, but it doesn't sound like you know the performance characteristics of dicts, and it doesn't sound like you've run the profiler...
      singulars
      1. POPython: Dictionary-Deleting keys having default values
      1. USthebjorn
    2. COCan you show a bit of your code, and a bit of your data? It's a little difficult to understand.
      singulars
      1. POPython: Dictionary-Deleting keys having default values
      1. USaIKid
    3. CODon't worry about doing it dynamically. It doesn't sound like it would be a problem for what you are doing. Just add it whenever you need to.
      singulars
      1. POPython: Dictionary-Deleting keys having default values
      1. USDale Myers
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload