Question: I heard somewhere that `NSManagedObjectContext` is a transactional log, so context stores operations with date when they were performed. 

Is it right? Am I able to get back this log?

Answer: 
Use format:

```
for i in range(18):
    print("sfo-router{}".format(i))

```
I'm new at python as well, and a quick google search did this one:

Just use `str.replace()`:

```
string = 'hey man'
string.replace(" ","")
# String is now 'heyman'

```

Source: [Python remove all whitespace in a string](https://stackoverflow.com/questions/8270092/python-remove-all-whitespace-in-a-string)