How to delete white stripes and unite the legends?

Question

I got this data:

	reg_month	no_ses_users	ses_users	no_ses_users_ptc
0	2021-01-01	29	101	22.31
1	2021-02-01	48	188	20.34
2	2021-03-01	86	303	22.11
3	2021-04-01	111	381	22.56
4	2021-05-01	141	479	22.74
5	2021-06-01	177	564	23.89
6	2021-07-01	224	661	25.31
7	2021-08-01	257	746	25.62
8	2021-09-01	289	832	25.78
9	2021-10-01	319	934	25.46
10	2021-11-01	341	1019	25.07
11	2021-12-01	384	1111	25.69
12	2022-01-01	422	1203	25.97
13	2022-02-01	451	1292	25.87
14	2022-03-01	482	1377	25.93
15	2022-04-01	518	1468	26.08
16	2022-05-01	544	1553	25.94
17	2022-06-01	584	1633	26.34
18	2022-07-01	620	1722	26.47
19	2022-08-01	651	1813	26.42
20	2022-09-01	662	1847	26.39

I make graph with second axis with plt.bar (y axis), plt.plot (second y axis):

    import matplotlib.pyplot as plt
    import seaborn as sns

    sns.set_style('darkgrid')

    fig, ax = plt.subplots(figsize=(10, 6))
    
    ax1 = plt.bar(
        x=df2_3['reg_month'],
        height=df2_3['ses_users'],
        label='Users with sessions',
        edgecolor = 'black',
        linewidth = 0,
        width=20,
        color = '#3049BF'
    )
    
    ax2 = plt.bar(
        x=df2_3['reg_month'],
        height=df2_3['no_ses_users'],
        bottom=df2_3['ses_users'],
        label='Users without sessions',
        edgecolor = 'black',
        linewidth = 0,
        width=20,
        color = '#BF9530'
    )
    
    secax = ax.twinx()
    secax.set_ylim(min(df2_3['no_ses_users_ptc'])*0.5, max(df2_3['no_ses_users_ptc'])*1.1)

    ax3 = plt.plot(
        df2_3['reg_month'],
        df2_3['no_ses_users_ptc'],
        color = '#E97800',
        label='Users without sessions, ptc'
    )
    
    ax.legend()
    secax.legend()
    
    plt.show()

How can I delete white stipes and unite the legend at one?

Output:

The White Stripes are Legend. – gboffi Jun 05 '23 at 14:21 — gboffi, Jun 05 '23 at 14:21
Haha. You should text this as the answer. =) – John Doe Jun 05 '23 at 17:12 — John Doe, Jun 05 '23 at 17:12

score 1 · Accepted Answer · answered Jun 05 '23 at 13:45

To combine the legends, you need to get the individual handles & labels for ax and secax, combine them and plot the same. The white lines you are seeing are the grid lines. You can turn them off using axes.grid(False). Add these lines just before plt.show() (and comment out your exsting legend lines) like below...

ax.grid(False)    ## Turn off grid lines for ax
secax.grid(False) ## Turn off grid lines for secax

h1, l1 = ax.get_legend_handles_labels()    ## Get the legend handles and labels for ax
h2, l2 = secax.get_legend_handles_labels() ## Get the legend handles and labels for secax

handles = h1 + h2  ## Combine handles
labels = l1 + l2   ## Combine labels
ax.legend(handles, labels)  ## Plot the combined legend

#ax.legend()    ## Need to comment out
#secax.legend() ## Need to comment out

plt.show()

How to delete white stripes and unite the legends?

1 Answers1