无法在 Pandas python 中绘制我的数据
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Unable to pie-plot my data in pandas python
提问by jmz
I want to create a pie-plot that will show country values. I have a single column csv file that has list of countries where the users are from that I read into a pandas dataframe. I've tried all sorts of pie-plot tutorials on web but was unable to plot this single column data.
我想创建一个显示国家/地区值的饼图。我有一个单列 csv 文件，其中包含我读入 Pandas 数据框的用户所在国家/地区的列表。我在网上尝试了各种饼图教程，但无法绘制这个单列数据。
fig = plt.pyplot.figure()
ax = fig.add_subplot(111)
ax.hist(country)
Data example:
数据示例：
country
0 BRAZIL
1 INDIA
2 INDIA
3 CHINA
4 RUSSIA
5 BRAZIL
回答by jmz
What you need to do is count the number of times each country appears before you plot it. Try this:
您需要做的是在绘制之前计算每个国家/地区出现的次数。尝试这个：
import pandas as pd
import matplotlib.pyplot as plt
#import your data here
#Plot a histogram of frequencies
df.country.value_counts().plot(kind='barh')
plt.title('Number of appearances in dataset')
plt.xlabel('Frequency')
#Now make a pie chart
df.country.value_counts().plot(kind='pie')
plt.axis('equal')
plt.title('Number of appearances in dataset')
