Menu
I have defined a slicing parameter in a config file:
max_items = 10
My class slices a list according to this parameter:
items=l[:config.max_itmes]
When max_items = 0, I want all items to be taken from l. The quick and dirty way is:
config.max_items=config.max_items if config.max_items>0 else 1e7
Assuming that there will be less then 1e7 items. However, I don't fancy using magic numbers. Is there a more Pythonic way of doing it, like an infinity integer constant?
306
Representing infinity as an Integer in python One can use float('inf') as an integer to represent it as infinity.
slice() Parametersstop - Integer until which the slicing takes place. The slicing stops at index stop -1 (last element). step (optional) - Integer value which determines the increment between each index for slicing. Defaults to None if not provided.
Second note, when no start is defined as in A[:2] , it defaults to 0. There are two ends to the list: the beginning where index=0 (the first element) and the end where index=highest value (the last element).
There is no "infinity integer constant" in Python, but using None in a slice will cause it to use the default for the given position, which are the beginning, the end, and each item in sequence, for each of the three parts of a slice.
>>> 'abc'[:None]
'abc'
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
