python代码调试（七）——输入输出及异常

牛板筋不筋

于 2019-08-17 11:15:36 发布

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分类专栏： Python

本文链接：https://blog.youkuaiyun.com/qq_42198024/article/details/99690597

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本文介绍Python中使用Pickle模块进行对象持久化的操作，包括如何存储和读取复杂对象，以及通过自定义异常来增强错误处理能力，确保程序的健壮性和安全性。

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Pickle

Python 提供了一个叫作 Pickle 的标准模块，通过它你可以将任何纯 Python 对象存储到一个文件中，并在稍后将其取回。这叫作持久地（Persistently）存储对象。

import pickle
shoplistfile = 'shoplist.data'
shoplist = ['apple','mango','carrot']
f = open(shoplistfile,'wb')
pickle.dump(shoplist,f)
f.close()
del shoplist
f = open(shoplistfile,'rb')
storedlist = pickle.load(f)
print(storedlist)

抛出异常

# encoding = UTF-8

class ShortInputException(Exception):

	def __init__(self,length,atleast):
		Exception.__init__(self)
		self.length = length
		self.length = length
		self.atleast = atleast
try:
	text = input ('enter something -->')
	if len(text) < 3:
		raise ShortInputException(len(text),3)
except EOFError:
	print('why did you do an EOF on me')
except ShortInputException as ex:
	print(('ShortInputException: The input was' +
		   '{0} long ,expected at least {1}').format(ex.length,ex.atleast))
else:
	print('no exception was raised')