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特性，它是一个 Pandas 时间戳对象.它具有(除其他外)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特征:

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)

我收到以下 AttributeError: 'Timestamp' object has no attribute 'i'，我明白了为什么我会遇到这个错误.

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

如何将引用的字符串取消引用以便我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

你只需要getattr():

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

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