Whilest learning Python 3 and converting some of my code from Java to Python 3.3 I came across a small problem I haven't been able to fix.
In Java I have this code (just dummy code to make it smaller):
public enum Mapping {
C11{public int getMapping(){ return 1;}},
C12{public int getMapping(){ return 2;}},
public abstract int getMapping();
}
String s = "C11";
System.out.println(Mapping.valueOf(s))
Works fine and prints the requisted '1' Trying to do this in Python doesn't work that easy (yet). I tried to imitate an Enum with:
class Mapping:
C11=1
C12=2
s = 'C11'
print(Mapping.Mapping.(magic should happen here).s)
Unfortunately I have no idea how to convert a string to an attribute to be called like that (or something similar).
I need this because I have a HUGE list in the class Mapping and need to convert seemingly random words read from a text file to an integer mapping.
You are looking for getattr
:
>>> getattr(Mapping, s)
1
From the documentation:
getattr(object, name[, default])
Return the value of the named attribute of object. name must be a string. If the string is the name of one of the object’s attributes, the result is the value of that attribute. For example,
getattr(x, 'foobar')
is equivalent tox.foobar
. If the named attribute does not exist, default is returned if provided, otherwiseAttributeError
is raised.