title: Plotting a python dict in order of key values
body: <p>I have a python dictionary that looks like this: </p>
  
  <pre><code>In[1]: dict_concentration
  Out[2] : {0: 0.19849878712984576,
  5000: 0.093917341754771386,
  10000: 0.075060643507712022,
  20000: 0.06673074282575861,
  30000: 0.057119318961966224,
  50000: 0.046134834546203485,
  100000: 0.032495766396631424,
  200000: 0.018536317451599615,
  500000: 0.0059499290585381479}
  </code></pre>
  
  <p>They keys are type int, the values are type float64. 
  Unfortunately, when I try to plot this with lines, matplotlib connects the wrong points (plot attached). How can I make it connect lines in order of the key values? <a href="https://i.stack.imgur.com/ZFYhP.png" rel="noreferrer"><img src="https://i.stack.imgur.com/ZFYhP.png" alt="enter image description here"></a></p>