How to capture an error message

[TheHacker707]

Hello, I need a way to capture an error message in a variable. For example:

>>> print('2'+2)
Traceback (most recent call last):
  File "<pyshell#0>", line 1, in <module>
    print('2'+2)
TypeError: must be str, not int

I want to be able to capture this Traceback error message in a variable, maybe using a try: except: block. So what I want to know is: is there a way to get this error in a variable?
-707