如何翻译“字节"对象转换为 Pandas Dataframe 中的文字字符串，Python3.x? [英] How to translate "bytes" objects into literal strings in pandas Dataframe, Python3.x?

问题描述

我有一个 Python3.x pandas DataFrame，其中某些列是用字节表示的字符串(如在 Python2.x 中)

I have a Python3.x pandas DataFrame whereby certain columns are strings which as expressed as bytes (like in Python2.x)

import pandas as pd
df = pd.DataFrame(...)
df
       COLUMN1         ....
0      b'abcde'        ....
1      b'dog'          ....
2      b'cat1'         ....
3      b'bird1'        ....
4      b'elephant1'    ....

当我使用 df.COLUMN1 按列访问时，我看到 Name: COLUMN1, dtype: object

When I access by column with df.COLUMN1, I see Name: COLUMN1, dtype: object

但是，如果我按元素访问，它是一个字节"对象

However, if I access by element, it is a "bytes" object

df.COLUMN1.ix[0].dtype
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'bytes' object has no attribute 'dtype'

如何将这些转换为常规"字符串?也就是说，我怎样才能摆脱这个 b'' 前缀?

How do I convert these into "regular" strings? That is, how can I get rid of this b'' prefix?

推荐答案

您可以使用矢量化的 str.decode 将字节字符串解码为普通字符串:

You can use vectorised str.decode to decode byte strings into ordinary strings:

df['COLUMN1'].str.decode("utf-8")

要对多列执行此操作，您可以只选择 str 列:

To do this for multiple columns you can select just the str columns:

str_df = df.select_dtypes([np.object])

全部转换:

str_df = str_df.stack().str.decode('utf-8').unstack()

然后您可以用原始 df cols 换出转换后的 cols:

You can then swap out converted cols with the original df cols:

for col in str_df:
    df[col] = str_df[col]

这篇关于如何翻译“字节"对象转换为 Pandas Dataframe 中的文字字符串，Python3.x?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！