本文介绍了一个使用Python进行文件操作的例子，包括如何写入文件、读取文件内容，并将读取的内容进行格式化处理后再写入新的文件中。通过这个例子可以了解到Python中文件的基本操作方法。
#Filename: using_file.py
poem = '''\
Programming is fun
When the work is done
if you wanna make your work also fun:
use Python!
'''
e = open('../poem.txt','w')
e.write(poem)
e.close()
new = []
f = open('../poem.txt','r+')
n = 0
for i in f.readlines():
newline = "%d %s"%(n,i)
new.append(newline)
n += 1
f.close()
f = open("poem_new.txt","w+")
f.writelines(new)
poem = '''\
Programming is fun
When the work is done
if you wanna make your work also fun:
use Python!
'''
e = open('../poem.txt','w')
e.write(poem)
e.close()
new = []
f = open('../poem.txt','r+')
n = 0
for i in f.readlines():
newline = "%d %s"%(n,i)
new.append(newline)
n += 1
f.close()
f = open("poem_new.txt","w+")
f.writelines(new)
f.close()
解读：1，打开文件格式，为写，‘w’
2，每读出一句，然后就把log 处理，加上行首，重新写到新文件。
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