What is a pkl file?

The .pkl file is a file format used to store objects in Python, and its full name is "pickle". It is a module in the Python standard library that is used to serialize Python objects (i.e. convert objects into a stream of bytes) for easy transmission or storage between different Python programs.

The pickle module can implement the following functions:

Convert Python objects (such as dictionaries, lists, class instances, etc.) into binary data.
Deserialize binary data into Python objects.

This is useful in many situations, such as when you need to save a complex data structure to a file or transmit it over the network, and you can use pickle to convert it into a form that can be stored or transmitted.

Usage example:

import pickle

# 创建一个字典
data = {
    
    'name': 'John', 'age': 30, 'city': 'New York'}

# 将字典序列化并保存到文件
with open('data.pkl', 'wb') as file:
    pickle.dump(data, file)

# 从文件中加载并反序列化对象
with open('data.pkl', 'rb') as file:
    loaded_data = pickle.load(file)

print(loaded_data)

In the above code, we first create a dictionary data, then pickle.dump()serialize it and save it to a data.pklfile named. Next, we pickle.load()load the data from the file using and deserialize it into a Python object.

It should be noted that since pickle is a Python-specific format, there may be compatibility issues between different versions of Python. If you plan to share pickle files between different Python versions, it's best to make sure they are all the same or compatible versions.

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