Python Sets Cheat Sheet

A Programming › Python cheat sheet in English by Nouha_Thabet

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A set is a collection which is unordred and unindexed in a way that we cannot be sure in which order the items will appear.

RYB_color = {"Red","Yellow","Blue"} 
 print(RYB_color) 
 >>> {'Red','Yellow','Blue'}

RYB_color = set(("Red","Yellow","Blue"))

Example 1

for x in RYB_color:
        print(x) 
 >>> Red 
 >>> Yellow 
 >>> Blue

Example 2

print("Yellow" in RYB_color) 
 >>> True

Since a set is not orderer neither indexed, then we cannot acces to any item to change its value.

RYB_color.add("White") 
 print(RYB_color) 
 >>> "Red","White","Yellow","Blue"

print(len(RYB_color)) 
 >>> 3

del RYB_color

`RYB_color.remove("Yellow") print(RYB_color) >>> {'Red','Blue'}`
If the item doesn't exist then `remove()` will raise an error.
`RYB_color.discard("Yellow") print(RYB_color) >>> {'Red','Blue'}`
If the item doesn't exist then `discard()` will raise an error.
`c = thisset.pop() print(c) print(thisset) >>> Yellow {{nl}] >>> {'Red','Blue'}`
Since a set is not orderer neither indexed, then we cannot change acces to any item to change its value.
`RYB_color.clear()`
`clear()` returns an empty set.

`Second_color = {"Green","Orange","Purple"} Color = RYB_color.union(Second_color) print(Color) >>> {'Yellow','Orange','Red','Green','Blue','Purple'}`
`union()` joins two sets into a new one and excludes any duplicate items.
`RYB_color.update(Second_color) print(RYB_color) >>> {'Yellow','Orange','Red','Green','Blue','Purple'}`
`update()` inserts the items in `Second_color` into `RYB_color` and excludes any duplicate items.

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