如何在python中按字母順序使用顏色漸變的plot標簽？

Question

我想 plot 標簽“nutrition_grade_fr”在 python 中按字母順序排列，顏色漸變。

這是我的圖表的代碼，但它沒有按字母順序顯示標簽，也沒有顯示相應的色調：

import seaborn as sns
import matplotlib.pyplot as plt 

df = nutri_app

for elem in ['energy_100g', 'sugars_100g','fat_100g','proteins_100g']:
#Create barplot
    fig, ax = plt.subplots(figsize=(30,6))
    sns.barplot(x="pnns_group1", y=elem, hue="nutrition_grade_fr", data=df)

#Add title
    ax.set_title(f"nutriscore by categories related to {elem} quantity variable")

#Show plot
    plt.show()

Answer 1

您需要pandas.DataFrame.sort_values並選擇一個調色板（例如，藍色）：

import seaborn as sns
import matplotlib.pyplot as plt 

df = nutri_app.sort_values(by='nutrition_grade_fr') #ascending=True by default

for elem in ['energy_100g', 'sugars_100g','fat_100g','proteins_100g']:
#Create barplot
    fig, ax = plt.subplots(figsize=(30,6))
    sns.barplot(x="pnns_group1", y=elem, hue="nutrition_grade_fr", data=df, palette='Blues')

#Add title
    ax.set_title(f"nutriscore by categories related to {elem} quantity variable")

#Show plot
plt.show();