In the next line you can just have arguments without any problems:
An example that illustrates how you can write in the next line:
y = '1' + '2' + '3' + \
'4' + '5'
x = ('1' + '2' + '3' +
'4' + '5')
The Python style guide says that using the implicit continuation with parentheses is preferred, but in this particular case just adding parentheses around your expression is probably the wrong way to go.