如何创建一个函数来删除 Python 中的特殊字符以进行特征工程？

Question

我想创建一个函数来从熊猫数据框中删除特殊字符，但也传递一个参数来保留所需的字符。def strip_characters(c, req_char = ''):    spec_chars = ["!",'"',"#","%","&","'","(",")","*","+",",","-",".","/",":",";","<","=",">","?","@","[","\\","]","^","_","`","{","|","}","~","–"]    new_spec = spec_chars.remove(req_char)    for char in spec_chars:        c = c.str.replace(char, ' ')    return cdf['col'] = df['col'].apply(strip_characters,',')  # passing a comma to retain the character# df['col'] = ['Dining Room', 'Pre-War', 'Laundry in Building', '&Lobby']

Answer 1

尝试这个，

import pandas as pd

df = pd.DataFrame({'col':['Dining Room', 'Pre-War', 'Laundry in Building', '&Lobby']})

# ([^) means match anything but word character

# "[^\w+|,]" to exclude specific character's from being replaced

df['col'].str.replace("[^\w+]"," ")

输出

0            Dining Room

1                Pre War

2    Laundry in Building

3                  Lobby