Python：检查dataframe列是否包含字符串类型 [英] Python: Check if dataframe column contain string type

问题描述

我想检查数据框中的列是否由字符串组成，以便为机器学习目的用数字标记它们。有些列由数字组成，我不想更改它们。列示例如下所示：

I want check if columns in a dataframe consists of strings so I can label them with numbers for machine learning purposes. Some columns consists of numbers, I dont want to change them. Columns example can be seen below:

TRAIN FEATURES
  Age              Level  
  32.0              Silver      
  61.0              Silver  
  66.0              Silver      
  36.0              Gold      
  20.0              Silver     
  29.0              Silver     
  46.0              Silver  
  27.0              Silver      

谢谢您=）

推荐答案

是的，有可能。您使用 dtype

Yes, its possible. You use dtype

import pandas as pd
import numpy as np

df = pd.DataFrame({'a': ['a','b','c','d']})
if df['a'].dtype != np.number:
    print('yes')
else:
    print('no')

您还可以使用 select_dtypes

You can also select your columns by dtype using select_dtypes

df_subset = df.select_dtypes(exclude=[np.number])
# Now apply you can label encode your df_subset

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