dictionary{} processing

JamesCrandall

Looking for most efficient method to update a dictionary that I'm populating from a REST map service and then attempting to alter as needed.  The desired alteration is simple: duplicate each item and swap value in two of the attributes of the newly copied item.  Best way to describe is just show current vs. desired output below!

(attributes "juncA" and "juncB" must have their values swapped on copied item).

Current:

<SPAN class="punctuation token">{</SPAN>
  <SPAN class="string token">"junctionMatrix"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">[</SPAN>
    <SPAN class="punctuation token">{</SPAN>
      <SPAN class="string token">"attributes"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">{</SPAN>
        <SPAN class="string token">"WCU"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"C1"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"calcMethod"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"AERIAL"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"juncA"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"S47D"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"juncB"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"CR-03.0"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"juncDistance"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">8501.86072183</SPAN>
      <SPAN class="punctuation token">}</SPAN>
    <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="punctuation token">{</SPAN>
      <SPAN class="string token">"attributes"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">{</SPAN>
        <SPAN class="string token">"WCU"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"C1"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"calcMethod"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"AERIAL"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"juncA"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"S47B_C"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"juncB"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"S47D_S"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"juncDistance"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">17535.28122721</SPAN>
      <SPAN class="punctuation token">}</SPAN>
    <SPAN class="punctuation token">}</SPAN>
   <SPAN class="punctuation token">]</SPAN>
 <SPAN class="punctuation token">}</SPAN>  ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Desired:

<SPAN class="punctuation token">{</SPAN>
  <SPAN class="string token">"junctionMatrix"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">[</SPAN>
    <SPAN class="punctuation token">{</SPAN>
      <SPAN class="string token">"attributes"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">{</SPAN>
        <SPAN class="string token">"WCU"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"C1"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"calcMethod"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"AERIAL"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"juncA"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"S47D"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"juncB"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"CR-03.0"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"juncDistance"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">8501.86072183</SPAN>
      <SPAN class="punctuation token">}</SPAN>
    <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="punctuation token">{</SPAN>
      <SPAN class="string token">"attributes"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">{</SPAN>
      <SPAN class="string token">"WCU"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"C1"</SPAN><SPAN class="punctuation token">,</SPAN>
      <SPAN class="string token">"calcMethod"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"AERIAL"</SPAN><SPAN class="punctuation token">,</SPAN>
      <SPAN class="string token">"juncA"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"CR-03.0"</SPAN><SPAN class="punctuation token">,</SPAN>
      <SPAN class="string token">"juncB"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"S47D"</SPAN><SPAN class="punctuation token">,</SPAN>
      <SPAN class="string token">"juncDistance"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">8501.86072183</SPAN>
    <SPAN class="punctuation token">}</SPAN>
    <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="punctuation token">{</SPAN>
      <SPAN class="string token">"attributes"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">{</SPAN>
        <SPAN class="string token">"WCU"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"C1"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"calcMethod"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"AERIAL"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"juncA"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"S47B_C"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"juncB"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"S47D_S"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"juncDistance"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">17535.28122721</SPAN>
      <SPAN class="punctuation token">}</SPAN>
    <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="punctuation token">{</SPAN>
      <SPAN class="string token">"attributes"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">{</SPAN>
        <SPAN class="string token">"WCU"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"C1"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"calcMethod"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"AERIAL"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"juncA"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"S47D_S"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"juncB"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"S47B_C"</SPAN><SPAN class="punctuation token">,</SPAN>
        <SPAN class="string token">"juncDistance"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">17535.28122721</SPAN>
      <SPAN class="punctuation token">}</SPAN>
    <SPAN class="punctuation token">}</SPAN>
   <SPAN class="punctuation token">]</SPAN>
 <SPAN class="punctuation token">}</SPAN> ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

DarrenWiens2

I'll leave it to you whether this is "most efficient", but it works:

<SPAN class="keyword token">import</SPAN> copy

new_list <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="punctuation token">]</SPAN>
<SPAN class="keyword token">for</SPAN> i <SPAN class="keyword token">in</SPAN> mydict<SPAN class="punctuation token">[</SPAN><SPAN class="string token">'junctionMatrix'</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">:</SPAN>
    i_copy <SPAN class="operator token">=</SPAN> copy<SPAN class="punctuation token">.</SPAN>deepcopy<SPAN class="punctuation token">(</SPAN>i<SPAN class="punctuation token">)</SPAN>
    i_copy<SPAN class="punctuation token">[</SPAN><SPAN class="string token">'attributes'</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="string token">'juncA'</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">=</SPAN> i<SPAN class="punctuation token">[</SPAN><SPAN class="string token">'attributes'</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="string token">'juncB'</SPAN><SPAN class="punctuation token">]</SPAN>
    i_copy<SPAN class="punctuation token">[</SPAN><SPAN class="string token">'attributes'</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="string token">'juncB'</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">=</SPAN> i<SPAN class="punctuation token">[</SPAN><SPAN class="string token">'attributes'</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="string token">'juncA'</SPAN><SPAN class="punctuation token">]</SPAN>
    new_list<SPAN class="punctuation token">.</SPAN>append<SPAN class="punctuation token">(</SPAN>i_copy<SPAN class="punctuation token">)</SPAN>
mydict<SPAN class="punctuation token">[</SPAN><SPAN class="string token">'junctionMatrix'</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">+=</SPAN> new_list
mydict

<SPAN class="punctuation token">{</SPAN><SPAN class="string token">'junctionMatrix'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="punctuation token">{</SPAN><SPAN class="string token">'attributes'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">{</SPAN><SPAN class="string token">'WCU'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'C1'</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="string token">'calcMethod'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'AERIAL'</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="string token">'juncA'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'S47D'</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="string token">'juncB'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'CR-03.0'</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="string token">'juncDistance'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">8501.86072183</SPAN><SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">,</SPAN>
  <SPAN class="punctuation token">{</SPAN><SPAN class="string token">'attributes'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">{</SPAN><SPAN class="string token">'WCU'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'C1'</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="string token">'calcMethod'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'AERIAL'</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="string token">'juncA'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'S47B_C'</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="string token">'juncB'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'S47D_S'</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="string token">'juncDistance'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">17535.28122721</SPAN><SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">,</SPAN>
  <SPAN class="punctuation token">{</SPAN><SPAN class="string token">'attributes'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">{</SPAN><SPAN class="string token">'WCU'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'C1'</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="string token">'calcMethod'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'AERIAL'</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="string token">'juncA'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'CR-03.0'</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="string token">'juncB'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'S47D'</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="string token">'juncDistance'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">8501.86072183</SPAN><SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">,</SPAN>
  <SPAN class="punctuation token">{</SPAN><SPAN class="string token">'attributes'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">{</SPAN><SPAN class="string token">'WCU'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'C1'</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="string token">'calcMethod'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'AERIAL'</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="string token">'juncA'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'S47D_S'</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="string token">'juncB'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="string token">'S47B_C'</SPAN><SPAN class="punctuation token">,</SPAN>
    <SPAN class="string token">'juncDistance'</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">17535.28122721</SPAN><SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">}</SPAN>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>