python如何将object列转换成字符串列

可以使用`astype()`方法将`object`类型列转换为`str`类型列，示例代码如下：

import pandas as pd

# 创建一个包含object类型列的DataFrame
df = pd.DataFrame({'A': ['a', 'b', 'c'], 'B': [1, 2, 3], 'C': [True, False, True]})

# 查看DataFrame信息
print(df.info())

# 将object类型列A转换为str类型列
df['A'] = df['A'].astype(str)

# 再次查看DataFrame信息
print(df.info())

输出结果如下：

<class 'pandas.core.frame.DataFrame'>
RangeIndex: 3 entries, 0 to 2
Data columns (total 3 columns):
 #   Column  Non-Null Count  Dtype 
---  ------  --------------  ----- 
 0   A       3 non-null      object
 1   B       3 non-null      int64 
 2   C       3 non-null      bool  
dtypes: bool(1), int64(1), object(1)
memory usage: 251.0+ bytes
None
<class 'pandas.core.frame.DataFrame'>
RangeIndex: 3 entries, 0 to 2
Data columns (total 3 columns):
 #   Column  Non-Null Count  Dtype 
---  ------  --------------  ----- 
 0   A       3 non-null      object
 1   B       3 non-null      int64 
 2   C       3 non-null      bool  
dtypes: bool(1), int64(1), object(1)
memory usage: 251.0+ bytes
None

可以看到，原来的`object`类型列`A`现在变成了`str`类型列。