在Python中使用eval或exec设置全局变量

Question

我先说一下，我完全同意你应该在变量名中避免使用数据，不过我们假装你想要一个这样的函数：

def setglobal(s, x):
  # Some kind of eval or exec trick like eval(s+' = '+x) so we end up
  # with a global variable whose name is the string s and that has a value of x.

Answer 1

这个看起来有效：

# Take a symbol name s as a string and a value x and eval(s+' = '+x) to set a 
# global variable with name s to value x. For getglobal(s) use eval(s).
def setglobal(s, x):
  exec "global "+s+"; "+s+" = "+repr(x) in globals()

Answer 2

这一定要用exec/eval的技巧吗？

def setglobal(s, x):
    globals()[s] = x