Python 无法获取预期的绘图

我从一本用python绘图的教科书中得到了一个例子

我所期望的是

但我不能做到。我得到了以下信息

我的代码：

import datetime as dt
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation

# Create figure for plotting
fig = plt.figure()
ax = fig.add_subplot(1,1,1)
xs = []
ys = []


 # This function is called periodically from FuncAnimation
def animate (i , xs , ys ) :

    tempc = round(np.random.random(), 2)

 # Add x and y to lists
    xs.append(dt.datetime.now().strftime('%H:%M:%S.%f'))
    ys.append(tempc)

 # Limit x and y lists to 20 items
    xs = xs [-20:]
    ys = ys [-20:]

 # Draw x and y lists
    ax.clear()
    ax.plot(xs, ys)

 # Format plot
    plt.xticks(rotation =45, ha='right')
    plt.subplots_adjust( bottom=0.30)
    plt.title(' Temperature Data ' )
    plt.ylabel( ' Temperature ( deg C) ' )

 # Set up plot to call animate( ) function periodically
ani = animation.FuncAnimation(fig , animate , fargs=(xs , ys ) ,
    interval =1000)
plt.show( )

我应该添加类似的for循环吗

from datetime import datetime, timedelta

试试这个：

#generate random number for temp
tempc = np.random.uniform(low=0, high=1, size=(60,))

#generate one minute timestamp
now = dt.datetime.now()
delta = timedelta(seconds=1)

for i in range(60):
    xs.append(now.strftime('%H:%M:%S'))
    now += delta

xs = np.array(xs)
ys = np.array(tempc)

试试这个：

#generate random number for temp
tempc = np.random.uniform(low=0, high=1, size=(60,))

#generate one minute timestamp
now = dt.datetime.now()
delta = timedelta(seconds=1)

for i in range(60):
    xs.append(now.strftime('%H:%M:%S'))
    now += delta

xs = np.array(xs)
ys = np.array(tempc)

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您的代码对我很有用。您使用的是什么环境？什么版本的matplotlib，什么后端？我不知道。我刚刚下载了Anaconda（Windows）并将代码粘贴到Spyder（Python 3.8）窗口中，然后运行它。matplotlib:3.2.2，您的代码适合我。您使用的是什么环境？什么版本的matplotlib，什么后端？我不知道。我刚刚下载了Anaconda（Windows）并将代码粘贴到Spyder（Python 3.8）窗口中，然后运行它，