我想用eval函数查看变量periods_6_lend_month2020-03-01_30_的值

用eval函数的时候提示非法标识，如下：

eval("periods_6_lend_month2020-03-01_30_")

Traceback (most recent call last):

File "C:\ProgramData\Anaconda3\lib\site-packages\IPython\core\interactiveshell.py", line 3296, in run_code

exec(code_obj, self.user_global_ns, self.user_ns)

File "<ipython-input-44-c0db317d9f3d>", line 1, in <module>

eval("periods_6_lend_month2020-03-01_30_")

File "<string>", line 1

periods_6_lend_month2020-03-01_30_

^

SyntaxError: invalid token

这是因为对eval函数的定义不清晰导致的，正确的代码应该是

global()["periods_6_lend_month2020-03-01_30_"]