我是一个 python/编程新手,也许我的问题根本没有意义。
我的问题是,如果变量是动态的,我无法将其设置为全局变量,我的意思是我可以这样做:
def creatingShotInstance():
import movieClass
BrokenCristals = movieClass.shot()
global BrokenCristals #here I declare BrokenCristals like a global variable and it works, I have access to this variable (that is a shot class instance) from any part of my script.
BrokenCristals.set_name('BrokenCristals')
BrokenCristals.set_description('Both characters goes through a big glass\nand break it')
BrokenCristals.set_length(500)
Fight._shots.append(BrokenCristals)
def accesingShotInstance():
import movieClass
return BrokenCristals.get_name()#it returns me 'BrokenCristals'
但如果不是这样做,我声明一个字符串变量,如下所示:
def creatingShotInstance():
import movieClass
a = 'BrokenCristals'
vars()[a] = movieClass.shot()
global a #this line is the only line that is not working now, I do not have acces to BrokenCristals class instance from other method, but I do have in the same method.
eval(a+".set_name('"+a+"')")
eval(a+".set_description('Both characters goes through a big glass\nand break it')")
eval(a+".set_length(500)")
Fight._shots.append(vars()[a])
def accesingShotInstance():
import movieClass
return BrokenCristals.get_name()#it returns me 'BrokenCristals is not defined'
我试过这个:
global vars()[a]
还有这个:
global eval(a)
但是它给了我一个错误。我该怎么办?
最佳答案
为了完整起见,这里是您最初问题的答案。但这几乎肯定不是您想要做的——在极少数情况下,修改作用域的 dict
是正确的做法。
globals()[a] = 'whatever'
关于python - 在python中声明一个全局动态变量,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/4277056/