ValueError:使用matplotlib，“标签"的长度必须为"x" [英] ValueError: 'label' must be of length 'x' using matplotlib

问题描述

我正在尝试使用可变数据绘制饼图.

I am trying to plot pie chart using varible data.

下面是我的代码. Postive_percentage 和 topic 都是列表，其数据来自代码的其他部分并通过各种操作获得.我从输出中发布了 Postive_percentage 和 topic 的值.

Below is my code. both Postive_percentage and topic is the list whose data comes from other part of code and through various operations. I have posted the value of Postive_percentage and topic from the output.

我是python的新手，所以我无法理解该问题. Postive_percentage ， topic 和颜色有7个变量，但仍然给我这个错误.

I am new to python thats why i am not able to understand the issue. Postive_percentage, topic and colors have 7 variables and still it is giving me this error.

#topic and Postive_percentage copied from output and was not manually inserted by me. 
    topic = ['VirginAmerica', 'UnitedAirline', 'SouthWestAirline', 'USAirline', 'AmericanAirline', 'SpiritAirline', 'DeltaAirline']
    Postive_percentage = [3.917525773195876, 10.0, 6.666666666666667, 10.0, 3.0, 5.0, 5.0]


sizes = Postive_percentage
    print(sizes)
    labels = str(topic)
   # makeitastring = ''.join(map(str, labels))
    print(labels)
    colors = ['yellowgreen', 'lightgreen', 'darkgreen', 'gold', 'red', 'lightsalmon', 'darkred']
    plt.pie(sizes, explode=None, labels=labels, colors=colors, autopct='%1.1f%%', shadow=True, startangle=90)   #line 240
    #plt.pie(sizes, labels, colors)
    plt.axis('equal')
    plt.legend()
    plt.show()

这是正在生成的错误.

Traceback (most recent call last):
  File "C:/Users/Aryana/Desktop/Sentimental-Analysis-on-Twitter-master/senti_twitter.py", line 248, in <module>
    main()
  File "C:/Users/Aryana/Desktop/Sentimental-Analysis-on-Twitter-master/senti_twitter.py", line 240, in main
    plt.pie(sizes, explode=None, labels=labels, colors=colors, autopct='%1.1f%%', shadow=True, startangle=90)
  File "C:\Users\Aryana\Desktop\Sentimental-Analysis-on-Twitter-master\venv\lib\site-packages\matplotlib\pyplot.py", line 3338, in pie
    frame=frame, rotatelabels=rotatelabels, data=data)
  File "C:\Users\Aryana\Desktop\Sentimental-Analysis-on-Twitter-master\venv\lib\site-packages\matplotlib\__init__.py", line 1855, in inner
    return func(ax, *args, **kwargs)
  File "C:\Users\Aryana\Desktop\Sentimental-Analysis-on-Twitter-master\venv\lib\site-packages\matplotlib\axes\_axes.py", line 2858, in pie
    raise ValueError("'label' must be of length 'x'")
ValueError: 'label' must be of length 'x'

推荐答案

在分配给标签时移除 str(..).如果要复制而不是仅参考，请用 list(..).

Remove the str(..) when assigning to labels. If you want a copy and not just the reference, replace it with list(..).

import matplotlib.pyplot as plt
topic = ['VirginAmerica', 'UnitedAirline', 'SouthWestAirline', 'USAirline', 'AmericanAirline', 'SpiritAirline', 'DeltaAirline']
Postive_percentage = [3.917525773195876, 10.0, 6.666666666666667, 10.0, 3.0, 5.0, 5.0]


sizes = Postive_percentage
print(sizes)
labels = list(topic)
# makeitastring = ''.join(map(str, labels))
print(labels)
colors = ['yellowgreen', 'lightgreen', 'darkgreen', 'gold', 'red', 'lightsalmon', 'darkred']
plt.pie(sizes, explode=None, labels=labels, colors=colors, autopct='%1.1f%%', shadow=True, startangle=90)   #line 240
#plt.pie(sizes, labels, colors)
plt.axis('equal')
plt.legend()
plt.show()

说明:
在列表上使用 str() 时，它将整个列表作为字符串，包括方括号.因此，在控制台打印时，您可能会认为这是一个列表，而它只是一个长字符串..

Explanation:
When using str() on a list, it makes the whole list as string, including the square-brackets. Therefore, when printing on console, you might have thought that this is a list, while it is just a long string..

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