Examples of Python problem solving

In this paper, the method of solving the problem of the majority of Python is described, and it is a more typical application. Share to everyone for your reference. Specific as follows:

Problem Description:

The most important element of the Multiset multiplicity is called the majority ... is a set of elements that can have duplicates, and the number of repetitions in this set is called its majority ...
if s = [1,2,2,2,3,5] weight is 2, its weight is 3

The instance code is as follows:

List_num = []list_num_count = 0dict_num ={} #从文件读入, the number of elements in the first behavior set of the file, after each behavior of an element list_num_count = Int (open (' Input.txt ', ' R ') . ReadLine ()) for Line_num, line in enumerate (open ("Input.txt", ' R ')):  if line_num > 0:    list_num + = Line.split ( ) #将读到的元素加入的字典中for item in List_num:  if Dict_num.has_key (item):    Dict_num[item] + = 1  else:    dict_ Num.setdefault (item,1)  pass# Find the number that has the most occurrences, find the Count Dict_sort_by_top = {}top_value = 0for valus in Dict_num.itervalues () :  if valus> top_value:    top_value = valus  pass# Find the majority based on the number of re ... This is due to the fact that there may be multiple elements with the same number of The_pop_num = 0the_pop_num_count = 0for keys,values in Dict_num.iteritems ():  if values = = Top_ Value:    print ' The pop num is%s,and the appear num is%s '% (keys,values)    the_pop_num = Keys    the_pop_num_co UNT = values# output to a file, the first behavior from the number, the second behavior of the Write_line = '%s\n%s '% (the_pop_num, The_pop_num_count) Open ("Output.txt", ' W '). Write ( Write_line)

This assumes that there is a sibling directory file Input.txt content as follows:

811372372459937

The first row of 8 represents the number of elements, followed by an element for each row.

The test environment is Python2.7.6,

The results of the Python program operation for input.txt files are as follows:

The pop num is 37,and the appear num is 3

Simultaneous generation of the Output.txt file records the majority of 37 and its repetition number 3.

Hopefully this article will help you with Python programming.

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