python练习-8.12

注：本代码是《python核心编程（第二版）》的第八章8-12的练习题的代码实现。

完成的功能：用户给出起始和结束的数字后给出一个下面的表格，分别显示出两个数字间所有整型的十进制、二进制、八进制及十六进制。如果字符是可打印的ASCLL符，也要打印出来。如果没有一个是可打印的字符，则省略掉ASCLL那一栏的表头。

代码实现如下：

 def format_print(start_index, end_index):
     seq = range(start_index, end_index + 1)
     title =  "DEC\tBIN\t\tOCT\tHEX"
     if (end_index >=32 and end_index <=126):
         title =  "DEC\tBIN\t\tOCT\tHEX\tASCLL"
     print title
     print "--------------------------------------------"
     for item in seq:
         if item >= 32 and item <= 126:
             print "%d\t%07d\t\t%o\t%x\t%s" % (item, int(bin(item)[2:]), item, item, chr(item))
         else:
             print "%d\t%07d\t\t%o\t%x" % (item, int(bin(item)[2:]), item, item)
     print '--------------------------------------------'

 def showmenu():
     prompt1 = 'enter start index, (Q)uit:'
     prompt2 = 'enter end  index, (Q)uit:'
     while True:
         start_index = raw_input(prompt1).strip().lower()
         if start_index == 'q':
             break
         if not start_index.isdigit():
             print "Error! wrong format!"
             continue
         else:
             start_index = int(start_index)    

         end_index = raw_input(prompt2).strip().lower()
         if end_index == 'q':
             break
         if not end_index.isdigit():
             print "Error! wrong format!"
             continue
         else:
             end_index = int(end_index)

         if (start_index >= end_index):
             continue
         format_print(start_index, end_index)        

 if __name__ == '__main__':
     showmenu()        

测试结果如下：

 enter start index, (Q)uit:9
 enter end  index, (Q)uit:18
 DEC     BIN             OCT     HEX
 --------------------------------------------
 9       0001001         11      9
 10      0001010         12      a
 11      0001011         13      b
 12      0001100         14      c
 13      0001101         15      d
 14      0001110         16      e
 15      0001111         17      f
 16      0010000         20      10
 17      0010001         21      11
 18      0010010         22      12
 --------------------------------------------
 enter start index, (Q)uit:26
 enter end  index, (Q)uit:41
 DEC     BIN             OCT     HEX     ASCLL
 --------------------------------------------
 26      0011010         32      1a
 27      0011011         33      1b
 28      0011100         34      1c
 29      0011101         35      1d
 30      0011110         36      1e
 31      0011111         37      1f
 32      0100000         40      20
 33      0100001         41      21      !
 34      0100010         42      22      "
 35      0100011         43      23      #
 36      0100100         44      24      $
 37      0100101         45      25      %
 38      0100110         46      26      &
 39      0100111         47      27      '
 40      0101000         50      28      (
 41      0101001         51      29      )
 --------------------------------------------
 enter start index, (Q)uit: