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Python Pandas DataFrame.to_numeric() 函数将传递的参数转换为数字类型。

pandas.DataFrame.to_numeric() 的语法

DataFrame.to_numeric(arg, errors="raise", downcast=None)

参数

返回值

如果解析成功，它将返回一个数值。如果传递了一个系列，那么它将返回一个系列；否则，它将返回 ndarray。

示例代码：DataFrame.to_numeric() 方法将一个 Series 转换为数值

import pandas as pd

series = pd.Series(['1.0', '2', '-3', '4', '5.5', '6.7'])
print("The Original Series is: \n")
print(series)

series1 = pd.to_numeric(series)
print("The Numeric Series is: \n")
print(series1)

输出：

The Original Series is: 

0    1.0
1      2
2     -3
3      4
4    5.5
5    6.7
dtype: object
The Numeric Series is: 

0    1.0
1    2.0
2   -3.0
3    4.0
4    5.5
5    6.7
dtype: float64

函数返回数值 Series

示例代码：DataFrame.to_numeric() 将一个 Series 转换为整数的方法

import pandas as pd

series = pd.Series(['1.0', '2', '-3', '4', '5', '6'])
print("The Original Series is: \n")
print(series)

series1 = pd.to_numeric(series, downcast='signed')
print("The Numeric Series is: \n")
print(series1)

输出：

The Original Series is: 

0    1.0
1      2
2     -3
3      4
4      5
5      6
dtype: object
The Numeric Series is: 

0    1
1    2
2   -3
3    4
4    5
5    6
dtype: int8

函数返回 int8 型 Series。