Creating multiple boxplots on the same graph from a dictionary

Question

I am trying to create a graph whereby the x axis is the key of the dictionary and the boxplot is from the information inside the dictionary. My dictionary can have many keys.

Data = {'ABC': [34.54, 34.345, 34.761], 'DEF': [34.541, 34.748, 34.482]}
    
for ID in Data:      
        plt.boxplot(Data[ID])
        plt.xlabel(ID)
plt.savefig('BoxPlot.png')
plt.clf()

It however seems to put the box plots on top of each other. I tried iterating the positions value within boxplot with no luck. I would also like to use the key as the xaxis value for each boxplot if possible.

To avoid unnecessary work on the part of someone willing to answer your question, please provide a [Minimal, Complete, and Verifiable example](https://stackoverflow.com/help/mcve). In particular, please provide toy datasets (the dictionnaries you are refering to). — Diziet Asahi, Sep 11 '18 at 10:33
Perhaps this example has the answer to your question: https://matplotlib.org/gallery/statistics/boxplot_demo.html — Moberg, Sep 11 '18 at 10:35

score 55 · Accepted Answer · answered Sep 11 '18 at 10:39

55

my_dict = {'ABC': [34.54, 34.345, 34.761], 'DEF': [34.541, 34.748, 34.482]}

fig, ax = plt.subplots()
ax.boxplot(my_dict.values())
ax.set_xticklabels(my_dict.keys())

answered Sep 11 '18 at 10:39

Diziet Asahi

38,379
7
60
75

1

in jupyter notebooks i get a warning `:5: UserWarning: FixedFormatter should only be used together with FixedLocator ax.set_xticklabels(my_dict.keys())` – thrau Dec 29 '20 at 16:58

score 0 · Answer 2 · answered Mar 18 '23 at 05:42

labels= parameter can be used to set x-axis labels.

my_dict = {'ABC': [34.54, 34.345, 34.761], 'DEF': [34.541, 34.748, 34.482]}
plt.boxplot(my_dict.values(), labels=my_dict.keys());

If it were a pandas dataframe, the labels are also applied automatically.

df = pd.DataFrame(my_dict)
df.plot(kind='box');

Creating multiple boxplots on the same graph from a dictionary

2 Answers2

Linked