Seaborn調色板 - 防止顏色回收

Question

Seaborn允許定義包含多種顏色的調色板，適用於多行圖表。但是，當將調色板設置爲多種顏色時，只會使用前六種顏色，之後顏色將循環使用，從而難以區分線條。這可以通過顯式調用調色板來覆蓋，但這不方便。有沒有辦法強制Seaborn電流調色板不要回收顏色，當超過6個定義？

實施例：

from matplotlib import pyplot as plt 
import pandas as pd 
import seaborn as sb 

# Define a palette with 8 colors 
cmap = sb.blend_palette(["firebrick", "palegreen"], 8) 
sb.palplot(cmap) 

# Set the current palette to this; only 6 colors are used 
sb.set_palette(cmap) 
sb.palplot(sb.color_palette()) 

df = pd.DataFrame({x:[x*10, x*10+5, x*10+10] for x in range(8)}) 
fig, (ax1, ax2) = plt.subplots(2,1,figsize=(4,6)) 
# Using the current palette, colors repeat 
df.plot(ax=ax1) 
ax1.legend(bbox_to_anchor=(1.2, 1)) 
# using the palette that defined the current palette, colors don't repeat 
df.plot(ax=ax2, color=cmap) 
ax2.legend(bbox_to_anchor=(1.2, 1)) ; 

Answer 1

溶液（T漢克斯@tcaswell的指針）：設置調色板顯式地使用所有的顏色：

# Setting the palette using defaults only finds 6 colors 
sb.set_palette(cmap) 
sb.palplot(sb.color_palette()) 
sb.palplot(sb.color_palette(n_colors=8)) 

# but setting the number of colors explicitly allows it to use them all 
sb.set_palette(cmap, n_colors=8) 
# Even though unless you explicitly request all the colors it only shows 6 
sb.palplot(sb.color_palette()) 
sb.palplot(sb.color_palette(n_colors=8)) 

# In a chart, the palette now has access to all 8 
fig, ax1 = plt.subplots(1,1,figsize=(4,3)) 
df.plot(ax=ax1) 
ax1.legend(bbox_to_anchor=(1.2, 1)) ;