python绘图入门

python绘图入门

学习了：https://zhuanlan.zhihu.com/p/34200452

API:https://matplotlib.org/api/pyplot_api.html

plot.py:

# 导入模块 as 取别名
import matplotlib.pyplot as plt
import matplotlib as mpl

mpl.rcParams["font.sans-serif"] = ["YouYuan"]

# 数据 列表
# X 轴
# input_values = [1,2,3,4,5]
input_values = list(range(1024))
# Y 轴
# squares = [1,4,9,16,25]
squares = [a ** 2 for a in input_values]

# 绘制图形
# plt.plot(input_values, squares)
plt.scatter(input_values, squares,c=squares, cmap=plt.cm.Blues)

# 设置标题，坐标轴加上标签
plt.title("中文Square Number",fontsize=24)
# plt.xlabel('Value', fontsize=14)
# plt.ylabel('Square of value', fontsize=14)

# 设置刻度的大小
# plt.tick_params(axis='both',labelsize=14)

# 展示出来
plt.show()

RandomWalk.py:

from random import choice

class RandomWalk:
    def __init__(self, num_points=500):
        '''初始化参数'''
        self.num_points = num_points
        # 初始位置
        self.x_values = [0]
        self.y_values = [0]

    def fill_walk(self):
        '''计算所有点的位置'''
        while len(self.x_values) < self.num_points:
            # 决定前进方向和前进距离
            x_direction = choice([-1, 1])
            x_distance = choice([0, 1, 2, 3, 4])
            x_step = x_direction * x_distance
            y_direction = choice([-1, 1])
            y_distance = choice([0, 1, 2, 3, 4])
            y_step = y_direction * y_distance
            # 拒绝原地踏步
            if x_step == 0 and y_step == 0:
                continue
            # 计算下一个点
            next_x = self.x_values[-1] + x_step
            next_y = self.y_values[-1] + y_step

            # 追加到列表里面
            self.x_values.append(next_x)
            self.y_values.append(next_y)

777.py:

import matplotlib.pyplot as plt

from RandomWalk import RandomWalk

# 实例化类
rw = RandomWalk(5000)
points_numbers = list(range(5000))
rw.fill_walk()
# plt.plot(rw.x_values,rw.y_values)
plt.scatter(rw.x_values,rw.y_values, s=15,c=points_numbers,cmap=plt.cm.Blues)

plt.show()