用python pandas 装箱列 [英] Binning column with python pandas

问题描述

我有一个带有数字值的数据框"列:

I have a Data Frame column with numeric values:

df['percentage'].head()
46.5
44.2
100.0
42.12

我想以栏数形式查看该列:

I want to see the column as bin counts:

bins = [0, 1, 5, 10, 25, 50, 100]

如何将结果与value counts合并为垃圾箱?

How can I get the result as bins with their value counts?

[0, 1] bin amount
[1, 5] etc 
[5, 10] etc 
......

推荐答案

您可以使用 pandas.cut :

You can use pandas.cut:

bins = [0, 1, 5, 10, 25, 50, 100]
df['binned'] = pd.cut(df['percentage'], bins)
print (df)
   percentage     binned
0       46.50   (25, 50]
1       44.20   (25, 50]
2      100.00  (50, 100]
3       42.12   (25, 50]

---

bins = [0, 1, 5, 10, 25, 50, 100]
labels = [1,2,3,4,5,6]
df['binned'] = pd.cut(df['percentage'], bins=bins, labels=labels)
print (df)
   percentage binned
0       46.50      5
1       44.20      5
2      100.00      6
3       42.12      5

或 numpy.searchsorted :

bins = [0, 1, 5, 10, 25, 50, 100]
df['binned'] = np.searchsorted(bins, df['percentage'].values)
print (df)
   percentage  binned
0       46.50       5
1       44.20       5
2      100.00       6
3       42.12       5

---

...然后 value_counts 或 groupby 并汇总 size :

---

...and then value_counts or groupby and aggregate size:

s = pd.cut(df['percentage'], bins=bins).value_counts()
print (s)
(25, 50]     3
(50, 100]    1
(10, 25]     0
(5, 10]      0
(1, 5]       0
(0, 1]       0
Name: percentage, dtype: int64

---

s = df.groupby(pd.cut(df['percentage'], bins=bins)).size()
print (s)
percentage
(0, 1]       0
(1, 5]       0
(5, 10]      0
(10, 25]     0
(25, 50]     3
(50, 100]    1
dtype: int64

默认情况下cut返回categorical.

Series方法将使用所有类别，即使数据

Series methods like Series.value_counts() will use all categories, even if some categories are not present in the data, operations in categorical.

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