如何在matplotlib中的水平条形图顶部添加标签？

Question

任何人都可以帮我把城市名称添加到每个水平条的顶部吗？我已经做了其他一切。只需要弄清楚这一点。

import pandas as pd
import matplotlib.pyplot as plt
df1 = pd.read_csv("city_populations.csv")

#selecting particular columns
df = df1[['name','group','year','value']]
year = df1['year']
df = df.sort_values(by=['value'],ascending=False)

#selceting rows with year 2020
curr_year = 2020
#create a variable with true if year == curr_year
curr_population = df['year'] == curr_year
curr_population = df[curr_population]
print(curr_population)

#drawing the graph
fig,ax = plt.subplots(figsize = (10,8))
#to flip barh
values = curr_population[::-1]['group']
labels = []
clrs = []
for x in values:
    if x == "India":
        clrs.append("#adb0ff")
    elif x == "Europe":
        clrs.append("#ffb3ff")
    elif x == "Asia":
        clrs.append('#90d595')
    elif x == "Latin America":
        clrs.append("#e48381")
    elif x == "Middle East":
        clrs.append("#aafbff")
    elif x == "North America":
        clrs.append("#f7bb5f")
    else:
        clrs.append("#eafb50")
bar_plot = ax.barh(curr_population[::-1]['name'],curr_population[::-1]['value'],color = clrs)
plt.show()

这是我为了得到条形图而写的代码。我需要指导每个条顶部的标签。

Answer 1

您必须将标签选项添加到< code>barh方法中

< code >在此输入代码 bar _ plot = ax . barh(curr _ population[::-1][' name ']，curr_population[::-1]['value']，color = clrs，label="test ")

如果你想更自由地定位标签，你可以使用这样的东西（取自 https://matplotlib.org/3.2.1/gallery/lines_bars_and_markers/barchart.html#sphx-glr-gallery-lines-bars-and-markers-barchart-py）：

def autolabel(rects):
    """Attach a text label above each bar in *rects*, displaying its height."""
    for rect in rects:
        height = rect.get_height()
        ax.annotate('{}'.format(height),
                    xy=(rect.get_x() + rect.get_width() / 2, height),
                    xytext=(0, 3),  # 3 points vertical offset
                    textcoords="offset points",
                    ha='center', va='bottom')

autolabel(ax)