python findFile(folders,file_name) 在所有目录列表中查找是否存在文件 存在则返回所在目录

findFile.py

# Finds a real file path among given folder paths
# and returns the path or None
#
# @type  folders: list<string>
# @param folders: list of paths to folders to look into
# @type  file_name: string
# @param file_name: file name to search
#
# @return string file path or None
def findFile(folders, file_name):
	if folders is None:
		return None

	for folder in folders:
		if os.path.exists(os.path.join(folder, file_name)) is True:
			return folder

	return None