1.d = {'a':8,'b':2,'c':3}
# The dictionary is unordered, and there is no direct ordering of the dictionary.
print(d.items()) # The result is a ('b', 2) tuple in a two-dimensional array
res = sorted (d.items(), key=lambda x:x[1 ])#Sort by 823 sort helps automatic looping
#sort, loop call
# print(res)
for k,v in res:
print(k,v) #Automatically get two values loopable
l = [
[1,2,3,4],
[1,2,3,4],
[1,2,3,4],
[1,2,3,4],
[1,2,3,4]
]
for a,b,c,d in l: #Multiple values can be looped and returned at the same time
print(a,b,c,d)
def my(name :str ): #When defining a function, the qualified type is specified but there is no actual limitation, which can be used as a code flag
print(name)