Am 16.05.2010 09:10, schrieb Yutao Deng:
Hi all:
I'm trying to learn to use Python wrote a applet to record every day
doing.
and i use the pickle
pickle.dump something to file no problem i think.
but pickle.load whith a problem. can not load all dict do my way that
what i pickle.dump().
My code:
####
import cPickle as pickle
pickle_file = open("data2","rb")
i = pickle.load(pickle_file)
print i
i = pickle.load(pickle_file)
print i
i = pickle.load(pickle_file)
print i
i = pickle.load(pickle_file)
print i
i = pickle.load(pickle_file)
print i
####
console show :
{'2010-5-23': ['1242', 'first']}
{'2010-5-24': ['1232', 'third']}
{'2010-5-25': ['211', 'second']}
{'2010-3-22': ['3211', 'fourrrr']}
{'2050-3-2': ['3990', '322']}
This is i want but that's silly. if the dict too much, then i have not
ideas.
the other way from
http://mail.python.org/pipermail/tutor/2005-July/039859.html
####
import cPickle as pickle
pickle_file = open("data2","rb")
number_of_pickles = pickle.load(pickle_file)
for n in range(number_of_pickles):
p = pickle.load(pickle_file)
print p
####
this way didnt work for me.
console show:
Traceback (most recent call last):
number_of_pickles = pickle.load(pickle_file)
cPickle.UnpicklingError: invalid load key, '
'.
how do i define a range for pickle.load a file . i mean that how can i
know how many dict in the data2.
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If you want to unpickle a file which contains an unknown number of
pickled objects, this should work. You'll get a list containing all the
objects.
#############################################################
import cPickle
import pprint
test_data_1 = {"2010-12-13": ["1324", "first"]}
test_data_2 = {"2010-12-14": ["234", "first_and_a_half"]}
test_data_3 = {"2010-12-15": ["132224", "second"]}
for data in (test_data_1, test_data_2, test_data_3):
with open("data2.pickle", "ab") as file_stream:
cPickle.dump(data, file_stream, 2)
with open("data2.pickle", "rb") as file_stream:
pickled_objects = []
while True:
try:
pickled_objects.append(cPickle.load(file_stream))
except EOFError:
break
print "Number of pickled objects is %s." % len(pickled_objects)
pprint.pprint(pickled_objects)
############################################################Cheers,
Jan
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