Difference between writing something on one line and on several lines

Question

Where is the difference when I write something on one line, seperated by a , and on two lines. Apparently I do not understand the difference, because I though t

Answer 1

A perfect explanation from Raymond Hettinger can be found in this PyCon 2013 video between 33:13 and 38:17:

https://www.youtube.com/watch?v=OSGv2VnC0go

Quote from his presentation:

• don't underestimate the advantages of updating state variabes at the same time
• eliminates an entire class of errors due to out-of-order updates