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【Python】验证文件是否可读可写

作者:Duncan / 发布于2014/11/18/ 704


	# Import python libs
	import os

	def is_writeable(path, check_parent=False):
	 '''
	 Check if a given path is writeable by the current user.

	 :param path: The path to check
	 :param check_parent: If the path to check does not exist, check for the
	 ability to write to the parent directory instead
	 :returns: True or False
	 '''

	 if os.access(path, os.F_OK) and os.access(path, os.W_OK):
	 # The path exists and is writeable
	 return True

	 if os.access(path, os.F_OK) and not os.access(path, os.W_OK):
	 # The path exists and is not writeable
	 return False

	 # The path does not exists or is not writeable

	 if check_parent is False:
	 # We're not allowed to check the parent directory of the provided path
	 return False

	 # Lets get the parent directory of the provided path
	 parent_dir = os.path.dirname(path)

	 if not os.access(parent_dir, os.F_OK):
	 # Parent directory does not exit
	 return False

	 # Finally, return if we're allowed to write in the parent directory of the
	 # provided path
	 return os.access(parent_dir, os.W_OK)

	def is_readable(path):
	 '''
	 Check if a given path is readable by the current user.

	 :param path: The path to check
	 :returns: True or False
	 '''

	 if os.access(path, os.F_OK) and os.access(path, os.R_OK):
	 # The path exists and is readable
	 return True

	 # The path does not exist
	 return False

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