My big holiday this year was to the US. Firstly I took a boat from Southampton to New York. Then a train from NY to Boston. And lastly a plane took me to Toronto. The weather was great, except on the boat. Boston and Toronto are very nice cities well worth a visit.
Here are the pictures :
Here are some photos from a visit to Leeds Castle, Canterbury Cathedral and Audley End :
Click on the picture to see them.
The with statement is a great addition to Python. One thing that might not be immediately clear from the documentation is how the __enter__ method has to be implemented. If you want to use the object containing __enter__ then you have to return self there. You should not create a new object and return it. Here’s an example :
class example():
def __init__(self, login=False):
self.setting = 'A'
print '__init__'
def __enter__(self):
print 'Entering '
return self
def __exit__(self, exctype, value, traceback):
print 'Exiting '
with example() as e:
print e.setting
The output of this script is :
__init__
Entering
A
Exiting
So __init__ is called first and then __enter__. Then the block after the with statement is executed, followed by __exit__ .
Of course you can return another object in __enter__ if necessary. In a lot of cases that might make more sense.
Here are two great podcasts that make my ride into work more enjoyable :
Well worth subscribing to.
