What's the difference between a[] and a[:] when assigning values?

What's the difference between a[] and a[:] when assigning values?

References

Reference NO 1

http://stackoverflow.com/questions/7459160/whats-the-difference-between-initialization-and-assignment-in-c-sharp

Reference NO 2

http://stackoverflow.com/questions/5336226/whats-the-difference-between-those-two-ways-to-initialize-fields-in-java

Reference NO 3

http://stackoverflow.com/questions/6334475/what-is-the-difference-between-assigning-a-value-to-an-index-of-an-array-and-ass

Reference NO 4

http://stackoverflow.com/questions/10155951/what-is-the-difference-between-slice-assignment-that-slices-the-whole-list-and-d

Reference NO 5

http://docs.autodesk.com/3DSMAX/15/ENU/MAXScript-Help/files/GUID-34D853AE-9747-4AD8-B587-9311D3320F02.htm

Reference NO 6

http://en.wikipedia.org/wiki/Assignment_(computer_science)

Reference NO 7

http://docs.python.org/3/faq/programming.html

Reference NO 8

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