Python sort sorted vs. sort (go)

The Python list built-in sort () method is used for sorting, or the Python built-in global sorted () method can be used to generate a new sequence for an iterative sequence ordering.

Sorted (Iterable,key=none,reverse=false), returns a new list that is valid for all objects that can be iterated

Sort (key=none,reverse=false) change list in place reverse:true reverse order; False Positive Order

Example1:

>>>sorted ([1,5,3,2,9])

[1,2,3,5,9]

>>>a=[5,3,2,1,4]

>>>a.sort ()

>>>a

[1,2,3,4,5] #若用list. Sort () the list itself will be modified

>>>sorted ({1: ' D ', 2: ' B ', 3: ' B ', 4: ' E ', 5: ' A '})

[1,2,3,4,5] #sorted () is valid for all iteration sequences

At python2.4 start, list.sort () and sorted () Add the key parameter to specify a function that is called before each element is compared.

Example2:

>>>sorted ("This was a test string from Andrew". Split (), Key=str.lower) #加了key, ignoring case

[' A ', ' Andrew ', ' from ', ' was ', ' string ', ' test ', ' this '] #key =len sorted by length

>>>sorted ("This was a test string from Andrew". Split ()) #未加key, default uppercase in front, lowercase in the rear

[' Andrew ', ' This ', ' a ', ' from ', ' is ', ' string ', ' test ']

It is more of a case to sort complex objects with certain values of complex objects.

Example3:

>>> student_tuples = [(' John ', ' A ', '), (' Jane ', ' B ', '), (' Dave ', ' B ', 10),]

>>> Sorted (student_tuples, Key=lambda student:student[2]) # Sort by age

[(' Dave ', ' B ', ten), (' Jane ', ' B ', '), (' John ', ' A ', 15)]

>>>student_tuples.sort (Key=lambda x:x[2])

[(' Dave ', ' B ', ten), (' Jane ', ' B ', '), (' John ', ' A ', 15)]

Example4:

>>>s= "hello79351worldmynameismrfiona0352231964"

>>> ". Join (Sorted (S,key=lambda x: (X.isdigit (), X.isdigit () and int (x)%2==0,x.islower (), X.isupper (), x)))

' FHIMMNWaadeeilllmnooorrsy113335579902246 '

Uppercase before, lowercase in, number last and odd before even

>>>s={' A ': ten, ' t ': 5, ' C ': 2, ' B ': 12}

>>>sorted (S,key=lambda x:x[0])

[' A ', ' B ', ' C ', ' t ']

>>>s=[]

Original address: https://www.cnblogs.com/MrFiona/p/5958918.html

Python sort sorted vs. sort (go)