os.walk 返回一个生成器，该生成器创建一个值元组（current_path，current_path中的目录，current_path中的文件）。
每次调用生成器时，它将递归地跟踪每个目录，直到从调用walk的初始目录中没有其他子目录可用为止。
因此，
os.walk('C:\dir1\dir2\startdir').next()[0] # returns 'C:\dir1\dir2\startdir'
os.walk('C:\dir1\dir2\startdir').next()[1] # returns all the dirs in 'C:\dir1\dir2\startdir'
os.walk('C:\dir1\dir2\startdir').next()[2] # returns all the files in 'C:\dir1\dir2\startdir'
所以
import os.path
....
for path, directories, files in os.walk('C:\dir1\dir2\startdir'):
if file in files:
print('found %s' % os.path.join(path, file))
或这个
def search_file(directory = None, file = None):
assert os.path.isdir(directory)
for cur_path, directories, files in os.walk(directory):
if file in files:
return os.path.join(directory, cur_path, file)
return None
或者，如果您要查找文件，可以执行以下操作：
import os
def search_file(directory = None, file = None):
assert os.path.isdir(directory)
current_path, directories, files = os.walk(directory).next()
if file in files:
return os.path.join(directory, file)
elif directories == '':
return None
else:
for new_directory in directories:
result = search_file(directory = os.path.join(directory, new_directory), file = file)
if result:
return result
return None
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