pandas 如何从熊猫系列绘制条形图？
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How to plot a bar graph from a pandas series?
提问by Aashil
Consider my series as below: First column is article_id and the second column is frequency count.
考虑我的系列如下：第一列是 article_id，第二列是频率计数。
article_id
1 39
2 49
3 187
4 159
5 158
...
16947 14
16948 7
16976 2
16977 1
16978 1
16980 1
Name: article_id, dtype: int64
I got this series from a dataframe with the following command:
我使用以下命令从数据框中获得了这个系列：
logs.loc[logs['article_id'] <= 17029].groupby('article_id')['article_id'].count()
logs is the dataframe here and article_id is one of the columns in it.
logs 是这里的数据框，而 article_id 是其中的列之一。
How do I plot a bar chart(using Matlplotlib) such that the article_id is on the X-axis and the frequency count on the Y-axis ?
如何绘制条形图（使用 Matlplotlib），使 article_id 在 X 轴上，频率计数在 Y 轴上？
My natural instinct was to convert it into a list using .tolist() but that doesn't preserve the article_id.
我的本能是使用 .tolist() 将其转换为列表，但这不会保留 article_id。
回答by jezrael
IIUC you need Series.plot.bar:
IIUC你需要Series.plot.bar：
#pandas 0.17.0 and above
s.plot.bar()
#pandas below 0.17.0
s.plot('bar')
Sample:
样本：
import pandas as pd
import matplotlib.pyplot as plt
s = pd.Series({16976: 2, 1: 39, 2: 49, 3: 187, 4: 159,
5: 158, 16947: 14, 16977: 1, 16948: 7, 16978: 1, 16980: 1},
name='article_id')
print (s)
1 39
2 49
3 187
4 159
5 158
16947 14
16948 7
16976 2
16977 1
16978 1
16980 1
Name: article_id, dtype: int64
s.plot.bar()
plt.show()
回答by Jinhua Wang
The new pandas APIsuggests the following way:
新的Pandas API建议采用以下方式：
import pandas as pd
s = pd.Series({16976: 2, 1: 39, 2: 49, 3: 187, 4: 159,
5: 158, 16947: 14, 16977: 1, 16948: 7, 16978: 1, 16980: 1},
name='article_id')
s.plot(kind="bar", figsize=(20,10))
If you are working on Jupyter, you don't need the matplotliblibrary.
如果您正在使用 Jupyter，则不需要该matplotlib库。
回答by Archana
Just use 'bar' in kind parameter of plot
只需在情节的实物参数中使用'bar'
Example
例子
series = read_csv('BwsCount.csv', header=0, parse_dates=[0], index_col=0, squeeze=True, date_parser=parser)
series.plot(kind='bar')
Default value of kind is 'line' (ie. series.plot() --> will automatically plot line graph)
kind 的默认值为“line”（即 series.plot() --> 将自动绘制折线图）
For your reference:
供你参考：
kind : str
‘line' : line plot (default)
‘bar' : vertical bar plot
‘barh' : horizontal bar plot
‘hist' : histogram
‘box' : boxplot
‘kde' : Kernel Density Estimation plot
‘density' : same as ‘kde'
‘area' : area plot
‘pie' : pie plot
