Python Learning Notes

Collection

{} can represent a collection, {"As", "SST"} is a set set, and there are no duplicate elements in the collection.

#add ()  adding elements to the collection girls = {' MF ', ' sl ', ' YJ '}girls.add (' XF ')

#pop ()  randomly deletes an element in the collection boys = {' BD ', ' ZW ', ' JL ', ' zy '}result = Boys.pop ()

#remove ()  Delete the specified element in the collection  removes the element that does not exist boys = {' BD ', ' ZW ', ' JL ', ' Zy '}boys.remove (' Zy ')

#discard ()  Delete the specified element in the collection  removes the element that does not exist boys = {' BD ', ' ZW ', ' JL ', ' Zy '}boys.discard (' zy1 ')

#clear ()  emptying collection boys = {' BD ', ' ZW ', ' JL ', ' Zy '}boys.clear ()

#copy ()  Copy Collection boys = {' BD ', ' ZW ', ' JL ', ' zy '}newboys = Boys.copy ()

#Difference () calculates the difference set of 2 sets dreamers = {‘ljl ",  ' wc",  ' xy" zb  ",  ' lsy ' }girls = { ' MMF  ",  ' lsy",  ' syj "}result = Dreamers.difference (girls)         

#Union ()  and set operation

# Update()  and set updates  (same as Union action)

#intersection ()  calculates the intersection of 2 sets

#Issuperset ()  detects if the current collection is a superset of another collection

#Issubset ()  detects if the current collection is a subset of another collection

#Isdisjoint ()  detects that there is no intersection of 2 sets if there is an  intersection False

The ord () function is the Chr () function (for 8-bit ASCII strings) or the UNICHR () function (for Unicode objects), which returns the corresponding ASCII value as an argument with a character (a string of length 1), or Unicode value,

bin () Returns a binary representation of an integer int or long int.
Python can perform bitwise operations directly, A & B, a|b,a^b (OR), ~ (negation),<<,>>

Python Learning Notes