Plotting a python dict in order of key values

Question

I have a python dictionary that looks like this:

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} 

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?

Answer 1

Python dictionaries are unordered. If you want an ordered dictionary, use collections.OrderedDict

In your case, sort the dict by key before plotting,

import matplotlib.pylab as plt  lists = sorted(d.items()) # sorted by key, return a list of tuples  x, y = zip(*lists) # unpack a list of pairs into two tuples  plt.plot(x, y) plt.show() 

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Here is the result.