why is this variable not printing out properly?

[dursland]

Using python3 and am new - learning via introtopython.org and I'm having a problem.

var1 = (2+2)

print('The result of all calculations is ' + var1 + ' and we are done.')

Which returns the error of

Traceback (most recent call last):
  File "test.py", line 3, in <module>
    print('The result of all calculations is ' + var1 + ' and we are done.')
TypeError: Can't convert 'int' object to str implicitly

What am I doing wrong? When I change the variable to a string the line executes properly.