如何在 discord.py 中创建可以打印线性方程图形的命令？

Question

import discord
from discord.ext import commands
import matplotlib.pyplot as plt


class Equations(commands.Cog):

    def __init__(self, client):
        self.client = client

    def plotlineareq(a, b, clr):
        x = [-10, 10]
        y = [(a * i + b) for i in x]
        plt.figure(figsize=(7, 7))  # #Size of Graph
        plt.xlim(x)  # #X Range [-6,6]
        plt.ylim(x)  # #Y Range [-6,6]
        axis = plt.gca()  # #Get Current Axis
        plt.plot(axis.get_xlim(), [0, 0], 'k--')  # #X Axis Plots Line Across
        plt.plot([0, 0], axis.get_ylim(), 'k--')  # #Y Axis Plots Line Across
        plt.locator_params(axis="x", nbins=20)
        plt.locator_params(axis="y", nbins=20)
        plt.plot(x, y, label='linear', linestyle='-', color=clr)
        plt.ylabel('y')
        plt.xlabel('x')
        mm = str(a)
        bb = str(b)
        plt.title("y = " + mm + "x + " + bb)
        plt.grid()
        plt.savefig("foo.png")

    @commands.command()
    async def linear(self, message):
        try:
            msg = message.content
            msg = msg.split("*linear")[1]
            msg = msg.replace(" ", "")
            mm = msg.split("x")[0]
            mx = mm.replace("x", "").replace("y=", "")
            bx = msg.split("+")[1]
            Equations.plotlineareq(mx, bx, 'b')
            file = discord.File("foo.png", filename='foo.png')
            embed = discord.Embed(color=0xff0000)
            embed = embed.set_image(url="attachment://foo.png")
            await message.channel.send(file=file, embed=embed)
        except:
            message.channel.send("An error occurred")

def setup(client):
    client.add_cog(Equations(client))

到目前为止，这是我的 cog 的代码。函数“plotlineareq()”首先制作一个有 4 个象限的图形。然后它接受变量“a”（梯度）和变量“b”（y 轴截距）。它根据这些变量创建一个图表并将其保存为 foo.png。这部分单独工作。另一个函数应该等待以我的前缀“*”和“线性”开头的消息。示例消息模板为“*linear y=3x+2”。发送消息时，它从消息中获取值 a 和 b（在本例中为 a=3 和 b=2。这部分也可以单独正常工作，然后使用这些变量运行函数“plotlineareq()”，然后获取它创建图像“foo”并将其作为嵌入发送。没有错误消息显示为输出。它似乎没有触发函数“线性”。我做错了什么？

编辑：采纳

的建议后

    @commands.command()
    async def linear(self, ctx, equation):
        try:
            equation = equation.replace(" ", "")
            mx = equation.split("x")[0]
            mx = equation.replace("x", "").replace("y=", "")
            bx = equation.split("+")[1]
            Equations.plotlineareq(mx, bx, 'b')
            file = discord.File("foo.png", filename='foo.png')
            embed = discord.Embed(color=0xff0000)
            embed = embed.set_image(url="attachment://foo.png")
            await ctx.channel.send(file=file, embed=embed)

它仍然无法正常工作。同样没有错误消息。它只是没有触发功能。

Answer 1

您在命令中首先传递的 message 参数将是 Context，您还需要传递等式参数

@commands.command()
async def linear(self, ctx, equation): # The `equation` arg is going to be a string
    print(equation)

# *linear y=3x+2
# [bot] y=3x+2

您的代码中还有更多错误

plotlineareq也应该把self作为第一个参数
调用plotlineareq函数时，不要这样调用Equation.plotlineareq，要这样调用：self.plotlineareq

您的整个代码已修复：

import discord
from discord.ext import commands
import matplotlib.pyplot as plt


class Equations(commands.Cog):
    def __init__(self, client):
        self.client = client

    def plotlineareq(self, a, b, clr):
        x = [-10, 10]
        y = [(a * i + b) for i in x]
        plt.figure(figsize=(7, 7))  # #Size of Graph
        plt.xlim(x)  # #X Range [-6,6]
        plt.ylim(x)  # #Y Range [-6,6]
        axis = plt.gca()  # #Get Current Axis
        plt.plot(axis.get_xlim(), [0, 0], 'k--')  # #X Axis Plots Line Across
        plt.plot([0, 0], axis.get_ylim(), 'k--')  # #Y Axis Plots Line Across
        plt.locator_params(axis="x", nbins=20)
        plt.locator_params(axis="y", nbins=20)
        plt.plot(x, y, label='linear', linestyle='-', color=clr)
        plt.ylabel('y')
        plt.xlabel('x')
        mm = str(a)
        bb = str(b)
        plt.title("y = " + mm + "x + " + bb)
        plt.grid()
        plt.savefig("foo.png")

    @commands.command()
    async def linear(self, ctx, equation):
        try:
            equation = equation.replace(" ", "")
            mx = equation.split("x")[0]
            mx = equation.replace("x", "").replace("y=", "")
            bx = equation.split("+")[1]
            self.plotlineareq(mx, bx, 'b')
            file = discord.File("foo.png", filename='foo.png')
            embed = discord.Embed(color=0xff0000)
            embed = embed.set_image(url="attachment://foo.png")
            await ctx.send(file=file, embed=embed)
        
        except Exception as e:
            await ctx.send(f"An error occured: {e}")

def setup(client):
    client.add_cog(Equation(client))

如何在 discord.py 中创建可以打印线性方程图形的命令？

How can I make a command in discord.py that can print the graph of a linear equation?

python

matplotlib

python-3.x

discord.py

discord.py-rewrite