"Cut" big log file according to wanted dates?

[buran]

If I understadn correct , it will "cut" after the first space?

str.split() (i.e. without argument) will split at any white space and yield list. That's on the RHS. Then on the LHS using extended iterable unpacking we assign first element to my_date and rest of the elements to rest

If you are unfamiliar with unpacking in general check e.g. https://stackoverflow.com/q/2322355/4046632