python matplotlib--＞柱形图

news2025/2/25 15:51:23

环境
python:python-3.12.0-amd64

包:
matplotlib 3.8.2

#https://blog.csdn.net/aobulaien001/article/details/134611729
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import random

class TestPltText():
    def __init__(self):
        super(TestPltText, self).__init__()

        # 读取excel数据
        self.data = "plt_text.xlsx"
        self.data_excel = pd.DataFrame(pd.read_excel(self.data))

        # 获取相关内容
        self.data_content = self.data_excel[["月份", "销量"]]
        self.data_content01 = self.data_content.sort_values("销量", ascending=True)
        self.data_content01 = self.data_content.sort_values("销量", ascending=True)
    def test_plt_text(self):

        # 设置窗口大小
        plt.figure(figsize=(5, 4))

        # 构造x,y轴坐标
        y = np.array(list(self.data_content01["销量"]))
        x_ticks = list(self.data_content01["月份"])
        x = range(len(x_ticks))

        # 绘制柱形图
        plt.bar(x, y, width=0.5, align="center", color="b", alpha=0.6)
        plt.xticks(range(len(x_ticks)), x_ticks, fontsize=6, rotation=90)

        # x、y轴标签
        plt.xlabel('月份')
        plt.ylabel('销量')
        plt.title('月销量(万)')
        # 设置标签
        for label1, label2 in zip(x, y):
            plt.text(label1, label2+10,
                     '%.0f' % label2,
                     ha='center',
                     va='bottom',
                     fontsize=9)
        # 设置y轴的范围
        plt.ylim(0, 2600)
        plt.rcParams['font.sans-serif'] = ['SimHei']
        plt.show()

if __name__ == "__main__":
    plt_text = TestPltText()
    plt_text.test_plt_text()