Python sorted sorting method summary, pythonsorted

Python sorted sorting method summary, pythonsorted

This article describes how to sort by sorted in Python. We will share this with you for your reference. The details are as follows:

# Example 1. sort seq = [2, 4, 3, 1, 2, 3] by the number of times the element appears # sort by the number of times seq2 = sorted (seq, key = lambda x: seq. count (x) print (seq2) # [4, 1, 3, 3, 2, 2, 2] # improvement: First, priority, by number of times, the second priority is seq3 = sorted (seq, key = lambda x :( seq. count (x), x) print (seq3) # [1, 4, 3, 3, 2, 2, 2] ''' principle: first, compare the first value of the tuples. (Note: False <True) if the values are equal, the next value of the tuples is compared, and so on. '''

Running result:

# Example 2. this is a string sorting rule: lower case <upper case <odd number <even number s = 'asdf234gdsf23 's2 = "". join (sorted (s, key = lambda x: (x. isdigit (), x. isdigit () and int (x) % 2 = 0, x. isupper (), x) print (s2) # addffssDGS33224

Running result:

# Example 3. one interview question: list1 = [7,-8, 5, 4, 0,-2,-5] # requirement 1. A positive number is in the first negative number in the last 2. positive numbers from small to large 3. negative number from large to small list2 = sorted (list1, key = lambda x :( x <0, abs (x) print (list2) # [,-2, -5,-8]

Running result: