How to calculate a file of equations in python

[John]

Hi,
I have a text file which contains math expression, like this
134
+234
+234

(i.e. an operation (e.g. '+) and then a number and then a new line).

Can you please tell me what is the easiest way to calculate that file?
for example the above example should be = 134 + 234 + 234 = 602.

Thank you.