Python - Reading and Writing Files(file object, read method)

Practical Programming
An Introduction to Computer Science
Using Python 3
(Pragmatic Programmers)
(Pragmatic Bookshelf)
Paul Gries (著) Jennifer Campbell (著)
Jason Montojo (著) Lynn Beighley (編集)

開発環境

• OS X Mavericks - Apple(OS)
• Emacs (CUI)、BBEdit - Bare Bones Software, Inc. (GUI) (Text Editor)
• Python 3.4 (プログラミング言語)

Practical Programming: An Introduction to Computer Science Using Python 3 (Pragmatic Programmers) (Paul Gries (著)、Jennifer Campbell (著)、Jason Montojo (著)、Lynn Beighley (編集)、Pragmatic Bookshelf)のChapter 10(Reading and Writing Files)、10.10(Exercises) 4.を解いてみる。

10.10(Exercises) 4.

コード(BBEdit)

sample4.py

#!/usr/bin/env python3
#-*- coding: utf-8 -*-

def skipHeader(reader):
    line = reader.readline()
    line = reader.readline()
    while line.startswith('#'):
        line = reader.readline()
    return line

def processFile(reader):
    line = skipHeader(reader).strip()
    print(line)
    print(reader.read())

if __name__ == '__main__':
    with open('lynx.dat') as f:
        processFile(f)

入出力結果(Terminal, IPython)

$ ./sample4.py
269.  321.  585.  871. 1475. 2821. 3928. 5943. 4950. 2577.  523.   98.
  184.  279.  409. 2285. 2685. 3409. 1824.  409.  151.   45.   68.  213.        
  546. 1033. 2129. 2536.  957.  361.  377.  225.  360.  731. 1638. 2725.        
 2871. 2119.  684.  299.  236.  245.  552. 1623. 3311. 6721. 4245.  687.        
  255.  473.  358.  784. 1594. 1676. 2251. 1426.  756.  299.  201.  229.        
  469.  736. 2042. 2811. 4431. 2511.  389.   73.   39.   49.   59.  188.        
  377. 1292. 4031. 3495.  587.  105.  153.  387.  758. 1307. 3465. 6991.        
 6313. 3794. 1836.  345.  382.  808. 1388. 2713. 3800. 3091. 2985. 3790.        
  674.   81.   80.  108.  229.  399. 1132. 2432. 3574. 2935. 1537.  529.        
  485.  662. 1000. 1590. 2657. 3396.                                            
$ cat lynx.dat 
Annual Number of Lynx Trapped, MacKenzie River, 1821-1934
#Original Source: Elton, C. and Nicholson, M. (1942)
#"The ten year cycle in numbers of Canadian lynx",
#J. Animal Ecology, Vol. 11, 215--244.
#This is the famous data set which has been listed before in
#various publications:
#Cambell, M.J. and Walker, A.M. (1977) "A survey of statistical work on
#the MacKenzie River series of annual Canadian lynx trappings for the years
#1821-1934 with a new analysis", J.Roy.Statistical Soc. A 140, 432--436.
  269.  321.  585.  871. 1475. 2821. 3928. 5943. 4950. 2577.  523.   98.        
  184.  279.  409. 2285. 2685. 3409. 1824.  409.  151.   45.   68.  213.        
  546. 1033. 2129. 2536.  957.  361.  377.  225.  360.  731. 1638. 2725.        
 2871. 2119.  684.  299.  236.  245.  552. 1623. 3311. 6721. 4245.  687.        
  255.  473.  358.  784. 1594. 1676. 2251. 1426.  756.  299.  201.  229.        
  469.  736. 2042. 2811. 4431. 2511.  389.   73.   39.   49.   59.  188.        
  377. 1292. 4031. 3495.  587.  105.  153.  387.  758. 1307. 3465. 6991.        
 6313. 3794. 1836.  345.  382.  808. 1388. 2713. 3800. 3091. 2985. 3790.        
  674.   81.   80.  108.  229.  399. 1132. 2432. 3574. 2935. 1537.  529.        
  485.  662. 1000. 1590. 2657. 3396.                                            $