问题:使用pickle.dump-TypeError:必须为str,而不是字节
我正在使用python3.3,并且在尝试腌制一个简单的字典时遇到一个神秘的错误。
这是代码:
import os
import pickle
from pickle import *
os.chdir('c:/Python26/progfiles/')
def storvars(vdict):
f = open('varstor.txt','w')
pickle.dump(vdict,f,)
f.close()
return
mydict = {'name':'john','gender':'male','age':'45'}
storvars(mydict)
我得到:
Traceback (most recent call last):
File "C:/Python26/test18.py", line 31, in <module>
storvars(mydict)
File "C:/Python26/test18.py", line 14, in storvars
pickle.dump(vdict,f,)
TypeError: must be str, not bytes
回答 0
需要以二进制模式打开输出文件:
f = open('varstor.txt','w')
需要是:
f = open('varstor.txt','wb')
回答 1
只是有同样的问题。在Python 3中,必须指定二进制模式’wb’,’rb’,而在Python 2x中则不需要。当您遵循基于Python 2x的教程时,这就是您在这里的原因。
import pickle
class MyUser(object):
def __init__(self,name):
self.name = name
user = MyUser('Peter')
print("Before serialization: ")
print(user.name)
print("------------")
serialized = pickle.dumps(user)
filename = 'serialized.native'
with open(filename,'wb') as file_object:
file_object.write(serialized)
with open(filename,'rb') as file_object:
raw_data = file_object.read()
deserialized = pickle.loads(raw_data)
print("Loading from serialized file: ")
user2 = deserialized
print(user2.name)
print("------------")
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