Python calculates the number of book page statistics problem instance _python

This article is an example of Python Computing book page number statistics problem, is a Python program design of a more typical application example. Share to everyone for your reference. Specifically as follows:

Problem Description: For a given page number n, calculate how many digits are used in all page numbers 0,1,2,3,4...,9

The instance code is as follows:

def count_num1 (page_num): 
  num_zero = 0 
  num_one = 0 
  num_two = 0 
  num_three = 0 
  num_four = 0 
  NUM_FIV E = 0 
  num_six = 0 
  num_seven = 0 
  num_eight = 0 
  num_nine = 0 
  page_list = range (1,page_num + 1) 
  fo R page in page_list: 
    page = str (page) 
    Num_zero + = Page.count (' 0 ') 
    num_one + = Page.count (' 1 ') 
    num_ Two + = Page.count (' 2 ') 
    Num_three + + = Page.count (' 3 ') 
    Num_four + = Page.count (' 4 ') 
    num_five + = Page.count ( ' 5 ') 
    Num_six + + + = Page.count (' 6 ') 
    Num_seven + = Page.count (' 7 ') 
    num_eight + = Page.count (' 8 ' 
    ) num_ Nine + = Page.count (' 9 ') result 
  = [num_zero,num_one,num_two,num_three,num_four,num_five,num_six,num_seven,num_ Eight,num_nine] Return result 
 
print count_num1 (13) 

The above code is slightly bloated, so the code is changed.

The revised code is as follows:

def count_num2 (page_num): 
  page_list = range (1,page_num + 1) Result 
  = [0 to I in range (Ten)] for 
  page in page_l IST: 
    page = str (page) for 
    i in range: 
      temp = page.count (str (i)) 
      result[i] + = temp return 
  result< C9/>print count_num2 (13)

This article example test run environment for Python2.7.6

The result of the program output is:

[1, 6, 2, 2, 1, 1, 1, 1, 1, 1]

I hope this article will help you with your Python programming.