学步园

代码如下：

#encoding=utf-8

print '中国'

#计算目录间的相对路径

import os,itertools

def all_equal(elements):
    first_element = elements[0]
    for other_element in elements[1:]:
        if other_element != first_element : return False
    return True

def common_prefix(*sequences):
    if not sequences: return[],[]
    common = []
    for elements in itertools.izip(*sequences):
        if not all_equal(elements):break
        common.append(elements[0])
    return common,[sequence[len(common):] for sequence in sequences]

def relpath(p1,p2, sep=os.path.sep, pardir=os.path.pardir):
    common,(u1,u2) = common_prefix(p1.split(sep),p2.split(sep))
    if not common:
        return p2    
    return sep.join([pardir] * len(u1) + u2)


print relpath(r'D:/a/b/c',r'D:/a/b/d',r'/')
    

打印结果如下：

中国
False
../d