python - 仅用于表情符号的词云

Question

我有一个充满表情符号的文本。

import matplotlib.pyplot as plt
from wordcloud import WordCloud
wordcloud = WordCloud().generate(text)
plt.imshow(wordcloud)
plt.axis("off")
plt.show()

当我尝试为像上面的代码那样的表情符号获取 wordcloud 时，它返回如下错误:

ValueError: We need at least 1 word to plot a word cloud, got 0.

我认为 wordcloud 库无法读取表情符号。
我想得到这样的输出(当然还有表情符号):

有谁知道如何解决这个问题？

Answer 1

如果要创建表情符号词云，首先要获得支持表情符号的字体，例如Symbola并放置 otf或 ttf工作目录中的文件。
然后你需要安装所需的库:

pip install emojis matplotlib wordcloud

之后，您可以使用此代码创建包含表情符号的 Wordcloud。

from wordcloud import WordCloud
from collections import Counter
import matplotlib.pyplot as plt
import emojis

class EmojiCloud:
    def __init__(self, font_path='Symbola.otf'):
        self.font_path = font_path
        self.word_cloud = self.initialize_wordcloud()
        self.emoji_probability = None

        
    def initialize_wordcloud(self):
        return WordCloud(font_path=self.font_path,
                               width=2000,
                               height=1000,
                               background_color='white',
                               random_state=42,
                               collocations=False)

    
    def color_func(self, word, font_size, position, orientation, random_state=None,
                   **kwargs):
        hue_saturation = '42, 88%'

        current_emoji_probability = self.emoji_probability[word]
        if current_emoji_probability >= 0.10:
            opacity = 50
        else:
            opacity = 75 - current_emoji_probability/0.2 * 5
        return f"hsl({hue_saturation},{opacity}%)"

    def generate(self, text):
        emoji_frequencies = Counter(emojis.iter(text))
        total_count = sum(emoji_frequencies.values())
        
        self.emoji_probability = {emoji: count/total_count for emoji, count in emoji_frequencies.items()}
        wc = self.word_cloud.generate_from_frequencies(emoji_frequencies)
        
        plt.figure(figsize=(20,10))
        plt.imshow(wc.recolor(color_func=self.color_func, random_state=42))
        plt.axis("off")

此代码可以按如下方式使用:

text = 'a lot of emojis 😂😂😂😂🤯🤯🤯🚀🚀🚀🍷🍷🍷🍷🍷💡💡😅'

emoji_cloud = EmojiCloud(font_path='./Symbola.otf')
emoji_cloud.generate(text)

这将绘制以下结果: