Understanding Pickling in Python

Question

I have as of late got an assignment where I want to put a dictionary in pickled structure. The issue is I have no clue about what pickled structure is. Would anyone be able to point me to the correct way of some great resources to assist me with learning this idea?

Answer 1

The pickle module executes a major, yet incredible algorithm for serializing and de-serializing a Python object structure. 

Pickling - is the cycle whereby a Python object hierarchy is changed over into a byte stream, and Unpickling - is the converse activity, whereby a byte stream is changed over once again into an object hierarchy. 

Pickling (and unpickling) is on the other hand known as serialization, marshaling, or even flattening.

import pickle

data1 = {'a': [1, 2.0, 3, 4+6j],

         'b': ('string', u'Unicode string'),

         'c': None}

selfref_list = [1, 2, 3]

selfref_list.append(selfref_list)

output = open('data.pkl', 'wb')

# Pickle dictionary using protocol 0.

pickle.dump(data1, output)

# Pickle the list using the highest protocol available.

pickle.dump(selfref_list, output, -1)

output.close()

If you want to read from a pickled file, then:

import pickle

data1 = {'a': [1, 2.0, 3, 4+6j],

         'b': ('string', u'Unicode string'),

         'c': None}

selfref_list = [1, 2, 3]

selfref_list.append(selfref_list)

output = open('data.pkl', 'wb')

# Pickle dictionary using protocol 0.

pickle.dump(data1, output)

# Pickle the list using the highest protocol available.

pickle.dump(selfref_list, output, -1)

output.close()

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