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Python数据可视化入门:用matplotlib和Pygal让数据讲故事

  • 2026-07-04 02:41:07
Python数据可视化入门:用matplotlib和Pygal让数据讲故事

前14章我们一直在"练内功"——语法、函数、类、游戏开发……到了第15章,画风一转,Python开始帮你"说话"了。

不是真的说话,而是用图表说话。这一章学两个可视化库:matplotlib 画静态图,Pygal 做可交互图。学完之后,你看数据的眼光都不一样了。


01 先把工具装好

pip install matplotlib
pip install pygal

如果你的 Python 版本比较新(3.12+),matplotlib 装完可能有兼容警告,升级一下就行:

pip install matplotlib --upgrade

02 折线图:最经典的数据表达

matplotlib 的套路很简单——给数据,调参数,plt.show() 弹窗:

import matplotlib.pyplot as plt

squares = [1491625]
input_values = [12345]

plt.figure(figsize=(106))
plt.plot(input_values, squares, linewidth=5)

plt.title("Square Numbers", fontsize=24)
plt.xlabel("Value", fontsize=14)
plt.ylabel("Square of Value", fontsize=14)
plt.tick_params(axis='both', labelsize=14)

plt.show()

有个坑要注意:如果你只传了 squares 没传 input_values,x 轴会从 0 开始,图表变成 (0,1), (1,4), (2,9)… 完全歪了。


03 散点图:一眼看出相关性

折线图适合有序数据,散点图适合看两个变量之间的关系:

plt.scatter(x_values, y_values, s=100, c='red', edgecolor='none')

几个常用参数够应付大部分场景:

效果 代码
单个点 plt.scatter(2, 4, s=200)
多个点 plt.scatter(x_values, y_values, s=100)
去掉黑边 edgecolor='none'
颜色映射 c=y_values, cmap=plt.cm.Blues
保存图片 plt.savefig('filename.png', bbox_inches='tight')

颜色映射(colormap)是个很实用的功能——y 值越大颜色越深,等于图表自带第三维信息。


04 随机漫步:代码也能做行为艺术

这节是个有趣的思维模型——随机漫步(Random Walk)。每一步往哪个方向走、走多远,都是随机的。

from random import choice

class RandomWalk:
    def __init__(self, num_points=5000):
        self.num_points = num_points
        self.x_values = [0]
        self.y_values = [0]

    def fill_walk(self):
        while len(self.x_values) < self.num_points:
            x_direction = choice([1, -1])
            x_distance = choice([01234])
            x_step = x_direction * x_distance

            y_direction = choice([1, -1])
            y_distance = choice([01234])
            y_step = y_direction * y_distance

            # 拒绝原地踏步
            if x_step == 0 and y_step == 0:
                continue

            next_x = self.x_values[-1] + x_step
            next_y = self.y_values[-1] + y_step
            self.x_values.append(next_x)
            self.y_values.append(next_y)

可视化的时候,用颜色深浅表示步数顺序,起点标绿色、终点标红色:

plt.figure(figsize=(106))
point_numbers = list(range(rw.num_points))
plt.scatter(rw.x_values, rw.y_values, c=point_numbers,
            cmap=plt.cm.Blues, edgecolor='none', s=1)
plt.scatter(00, c='green', s=100)
plt.scatter(rw.x_values[-1], rw.y_values[-1], c='red', s=100)
plt.show()

每次运行出来的图都不一样,很有意思。


05 掷骰子:用Pygal做可交互直方图

matplotlib 出来的是静态 PNG,Pygal 出来的是 SVG——鼠标悬停能看到具体数值,还能嵌入网页。

from random import randint
import pygal

class Die:
    def __init__(self, num_sides=6):
        self.num_sides = num_sides

    def roll(self):
        return randint(1self.num_sides)

die = Die()
results = [die.roll() for _ in range(1000)]
frequencies = [results.count(value) for value in range(1, die.num_sides + 1)]

hist = pygal.Bar()
hist.title = "Results of rolling one D6 1000 times."
hist.x_labels = ['1''2''3''4''5''6']
hist.add('D6', frequencies)
hist.render_to_file('die_visual.svg')

双骰子也简单——把两次掷的点数相加:

die1 = Die()
die2 = Die()
results = [die1.roll() + die2.roll() for _ in range(1000)]

D6+D6 的总点数范围 2~12,但不是均匀分布——掷出 7 的概率最高(6 种组合),2 和 12 最低(各 1 种组合)。概率分布的直观体现。


06 怎么选:matplotlib 还是 Pygal?

场景 选哪个
快速探索数据、Jupyter 里看图 matplotlib
需要交互、悬停看数值 Pygal
保存高质量静态图片 matplotlib
做世界地图、地理数据 Pygal

别纠结,两个都会用就行。


下一章我们会更进一步——不再手动构造数据,而是从网上下载真实数据(CSV 和 JSON),然后可视化。天气数据、世界人口,都是用真实数据做图表,比掷骰子有意思多了。

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  1. CONNECT:[ UseTime:0.000663s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000954s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000338s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000277s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000642s ]
  6. SELECT * FROM `set` [ RunTime:0.000231s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000706s ]
  8. SELECT * FROM `article` WHERE `id` = 487688 LIMIT 1 [ RunTime:0.000514s ]
  9. UPDATE `article` SET `lasttime` = 1783134333 WHERE `id` = 487688 [ RunTime:0.005514s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000311s ]
  11. SELECT * FROM `article` WHERE `id` < 487688 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000631s ]
  12. SELECT * FROM `article` WHERE `id` > 487688 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001189s ]
  13. SELECT * FROM `article` WHERE `id` < 487688 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001897s ]
  14. SELECT * FROM `article` WHERE `id` < 487688 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001572s ]
  15. SELECT * FROM `article` WHERE `id` < 487688 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003105s ]
0.088976s