Python:通过字符串中的名称访问结构字段 [英] Python: access structure field through its name in a string

问题描述

在Scapy中，我想比较任意两个数据包a和b之间的头域数量.此字段列表是预定义的，例如:

In Scapy, I want to compare a number of header fields between any two packets a and b. This list of fields is predefined, say:

fieldsToCompare = ['tos', 'id', 'len', 'proto'] #IP header

通常我会单独进行:

if a[IP].tos == b[IP].tos:
   ... do stuff...

是否有任何方法可以从字符串列表访问这些数据包字段，包括每个字符串的名称?喜欢:

Is there any way to access those packet fields from a list of strings including what each one of them is called? Like:

for field in fieldsToCompare:
    if a[IP].field == b[IP].field:
         ... do stuff...

推荐答案

您可以使用 getattr() .这些行是等效的:

You can use getattr(). These lines are equivalent:

getattr(x, 'foobar')
x.foobar

setattr() 是其对应内容.

setattr() is its counterpart.

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