CODEWITHSUNDEEP
pythonarraysrange
klenium
klenium

Reputation: 2607

Get the whole array by range indexing

To retrieve a sub range of elements of an array, we can write myData[from : to] syntax.

I have a function, the simplified variant looks like this:

def myFunction(fromIndex, toIndex):
    return myData[fromIndex: toIndex]

Let's assume I can't / don't want to change the behavior of myFunction, but in some cases I want to get the whole array (ie. in theory fromIndex = 0, toIndex = len(myData). I can write x = myFunction(0, len(myData)), but in this case I have to know what ˙myData˙ means.

Is there any other way? Something like x = myFunction(, ), which would expand to return myData[ : ] and return the (copy of the) whole array. Does this range-indexing syntax has some special symbols? myData[0 : 0 or None] == myData?

Upvotes: 1

Views: 217

Answers (2)

Raja G
Raja G

Reputation: 6633

One more but similar

myData = [ 1, 3, 5, 7, 9 ]

def myFunction(fromIndex=None, toIndex=None):
    return myData[fromIndex: toIndex]

print(myFunction(fromIndex=0))

Upvotes: 0

Marat
Marat

Reputation: 15738

Use None values for either/both of the argument defaults. Natively, some_list[None:None] returns the whole list.

def myFunction(fromIndex=None, toIndex=None):
    return myData[fromIndex: toIndex]

# myFunction() will return the whole list

Upvotes: 2

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