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Python Pandas Series.head() 函数从开头返回选定的值。

pandas.Series.head() 的语法

Series.head(n=5)

参数

返回值

它返回 Series 的前 n 个值。

示例代码：Series.head() 方法返回 Series 的前 5 个值

import pandas as pd

series = pd.Series([ 'Rose', 'Jasmine', 'Lili', 'Tulip', 'Hibiscus', 'Sun Flower', 'Orchid', 'Carnation','Irises', 'Gardenias'])
print("The Original Series is: \n")
print(series)

series1 = series.head()
print("The First Five Values of Series From Start are: \n")
print(series1)

输出：

The Original Series is: 

0          Rose
1       Jasmine
2          Lili
3         Tulip
4      Hibiscus
5    Sun Flower
6        Orchid
7     Carnation
8        Irises
9     Gardenias
dtype: object
The First Five Values of Series From Start are: 

0        Rose
1     Jasmine
2        Lili
3       Tulip
4    Hibiscus
dtype: object

我们没有传入任何参数，因为 n 的默认值是 5。函数已经返回了给定 Series 的前五个值。

示例代码：Series.head() 方法返回 Series 的前 7 个值

import pandas as pd

series = pd.Series([ 'Rose', 'Jasmine', 'Lili', 'Tulip', 'Hibiscus', 'Sun Flower', 'Orchid', 'Carnation','Irises', 'Gardenias'])
print("The Original Series is: \n")
print(series)

series1 = series.head(7)
print("The First Seven Values of Series From Start are: \n")
print(series1)

输出：

The Original Series is: 

0          Rose
1       Jasmine
2          Lili
3         Tulip
4      Hibiscus
5    Sun Flower
6        Orchid
7     Carnation
8        Irises
9     Gardenias
dtype: object
The First Seven Values of Series From Start are: 

0          Rose
1       Jasmine
2          Lili
3         Tulip
4      Hibiscus
5    Sun Flower
6        Orchid
dtype: object

我们已经通过 n=7。该函数返回了给定 Series 的前七个值。

示例代码：Series.head() 返回空 Series 的方法

import pandas as pd

series = pd.Series([ 'Rose', 'Jasmine', 'Lili', 'Tulip', 'Hibiscus', 'Sun Flower', 'Orchid', 'Carnation','Irises', 'Gardenias'])
print("The Original Series is: \n")
print(series)

series1 = series.head(0)
print("The Empty Series is: \n")
print(series1)

输出：

The Original Series is: 

0          Rose
1       Jasmine
2          Lili
3         Tulip
4      Hibiscus
5    Sun Flower
6        Orchid
7     Carnation
8        Irises
9     Gardenias
dtype: object
The Empty Series is: 

Series([], dtype: object)

函数返回一个空序列。