使用字符串变量作为变量名

Question

可能重复:
如何在Python中执行变量变量？

我有一个变量,并为其分配了一个字符串,我想根据该字符串定义一个新变量.

foo = "bar"
foo = "something else"   

# What I actually want is:

bar = "something else"

Answer 1

你可以用exec它:

>>> foo = "bar"
>>> exec(foo + " = 'something else'")
>>> print bar
something else
>>> 

Answer 2

你会更乐意使用字典:

my_data = {}
foo = "hello"
my_data[foo] = "goodbye"
assert my_data["hello"] == "goodbye"

Answer 3

您可以使用 setattr

name  = 'varname'
value = 'something'

setattr(self, name, value) #equivalent to: self.varname= 'something'

print (self.varname)
#will print 'something'

但是,既然你应该通知一个对象接收新变量,我认为这只适用于类内部.