Python-遍历属性列表 [英] Python - Iterate over a list of attributes

问题描述

我的数据集中有一个功能是熊猫时间戳对象.它(除其他外)具有以下属性:年，小时，星期几，月.

I have a feature in my data set that is a pandas timestamp object. It has (among many others) the following attributes: year, hour, dayofweek, month.

我可以使用一些蛮力方法基于这些属性创建新功能:

I can create new features based on these attributes using some brute force methods:

df["year"] = df["timeStamp"].apply(lambda x : x.year)

df["hour"] = df["timeStamp"].apply(lambda x : x.hour)

. .

但是，我想遍历一个列表:

However, I want to iterate over a list:

nomtimes = ["year", "hour", "month", "dayofweek"]


for i in nomtimes:

  df[i] = df["timeStamp"].apply(lambda x : x.i)

我得到以下AttributeError:'Timestamp'对象没有属性'i'，我明白了为什么我会出现此错误.

I get the following AttributeError: 'Timestamp' object has no attribute 'i', and I get it and understand why I am having this error.

如何获取带引号的字符串以取消引用，以便可以将其作为属性传递?

How can I get the quoted string to unquote so that I can pass it as an attribute?

推荐答案

您只需要getattr():

df[i] = df["timeStamp"].apply(lambda x : getattr(x, i))

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