Python 高性能编程技巧精要

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Python 高性能编程技巧 Python Unlocked 是一本专门讲解高性能 Python 编程技巧的书籍，旨在帮助读者掌握高效的 Python 编程方法，提高编程效率和性能。下面是基于该书籍的知识点总结： 1. **高性能 Python 编程技巧**：本书涵盖了各种高性能 Python 编程技巧，旨在帮助读者提高编程效率和性能。这些技巧包括智能缓存、并行处理、数据压缩、优化算法等。 2. **Python 语言基础**：为了更好地理解高性能 Python 编程技巧，读者需要了解 Python 语言的基础知识，包括变量、数据类型、控制结构、函数、模块等。 3. **智能缓存**：智能缓存是高性能 Python 编程技巧之一，它可以大幅提高程序的执行速度。读者可以学习如何使用缓存来提高程序的性能。 4. **并行处理**：并行处理是高性能 Python 编程技巧之一，它可以大幅提高程序的执行速度。读者可以学习如何使用并行处理来提高程序的性能。 5. **数据压缩**：数据压缩是高性能 Python 编程技巧之一，它可以大幅减少数据的存储空间。读者可以学习如何使用数据压缩来提高程序的性能。 6. **优化算法**：优化算法是高性能 Python 编程技巧之一，它可以大幅提高程序的执行速度。读者可以学习如何使用优化算法来提高程序的性能。 7. **高性能 Python 库**：本书介绍了多种高性能 Python 库，包括 NumPy、SciPy、Pandas 等。这些库可以帮助读者提高编程效率和性能。 8. **性能优化**：性能优化是高性能 Python 编程技巧之一，它可以大幅提高程序的执行速度。读者可以学习如何使用性能优化来提高程序的性能。 9. **Python Best Practices**：本书介绍了 Python 编程 best practices，旨在帮助读者编写高质量、可维护的代码。 10. **Python 高级主题**：本书涵盖了多种 Python 高级主题，包括 Decorators、Generators、Itertools 等。这些主题可以帮助读者更好地理解 Python 语言。 Python Unlocked 是一本非常实用的书籍，旨在帮助读者掌握高性能 Python 编程技巧，提高编程效率和性能。

Python Unlocked(PACKT,2015)

2016-01-17 上传
Python is a versatile programming language that can be used for a wide range of technical tasks―computation, statistics, data analysis, game development, and more. Though Python is easy to learn, it’s range of features means there are many aspects of it that even experienced Python developers don’t know about. Even if you’re confident with the basics, its logic and syntax, by digging deeper you can work much more effectively with Python – and get more from the language. Python Unlocked walks you through the most effective techniques and best practices for high performance Python programming – showing you how to make the most of the Python language. You’ll get to know objects and functions inside and out, and will learn how to use them to your advantage in your programming projects. You will also find out how to work with a range of design patterns including abstract factory, singleton, strategy pattern, all of which will help make programming with Python much more efficient. Finally, as the process of writing a program is never complete without testing it, you will learn to test threaded applications and run parallel tests. If you want the edge when it comes to Python, use this book to unlock the secrets of smarter Python programming.

Python Unlocked pdf 无水印 0分

2016-01-17 上传
Paperback: 172 pages Publisher: Packt Publishing (December 30, 2015) Language: English ISBN-10: 1785885995 ISBN-13: 978-1785885990 Key Features Write smarter, bug-free, high performance code with minimal effort Uncover the best tools and options available to Python developers today Deploy decorators, design patters, and various optimization techniques to use Python 3.5 effectively Book Description Python is a versatile programming language that can be used for a wide range of technical tasks―computation, statistics, data analysis, game development, and more. Though Python is easy to learn, it's range of features means there are many aspects of it that even experienced Python developers don't know about. Even if you're confident with the basics, its logic and syntax, by digging deeper you can work much more effectively with Python – and get more from the language. Python Unlocked walks you through the most effective techniques and best practices for high performance Python programming - showing you how to make the most of the Python language. You'll get to know objects and functions inside and out, and will learn how to use them to your advantage in your programming projects. You will also find out how to work with a range of design patterns including abstract factory, singleton, strategy pattern, all of which will help make programming with Python much more efficient. Finally, as the process of writing a program is never complete without testing it, you will learn to test threaded applications and run parallel tests. If you want the edge when it comes to Python, use this book to unlock the secrets of smarter Python programming. What you will learn Manipulate object creation processes for instances, classes, and functions Use the best possible language constructs to write data structures with super speed and maintainability Make efficient use of design patterns to decrease development time and make your code more maintainable Write better test cases with an impro

1. 帮我分析一下，android上的报错，报错如下 Caused by: java.lang.IllegalStateException: SharedPreferences in credential encrypted storage are not available until after user is unlocked 2. 我这是系统应用，需要在锁屏下也能使用SharedPreferences，需要在系统中规避此问题

2023-05-30 上传
这个问题的根本原因是在 Android 中，当用户使用加密存储时，SharedPreferences 在用户解锁后才可用。而对于系统应用，如果需要在锁屏下也能使用SharedPreferences，需要在系统中规避此问题。 ...

Traceback (most recent call last): File "D:\python_project\test1.py", line 1, in <module> from bs4 import BeautifulSoup File "<frozen importlib._bootstrap>", line 1027, in _find_and_load File "<frozen importlib._bootstrap>", line 1002, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 945, in _find_spec File "<frozen importlib._bootstrap_external>", line 1439, in find_spec File "<frozen importlib._bootstrap_external>", line 1411, in _get_spec File "<frozen zipimport>", line 170, in find_spec File "<frozen importlib._bootstrap>", line 431, in spec_from_loader File "<frozen importlib._bootstrap_external>", line 741, in spec_from_file_location File "<frozen zipimport>", line 229, in get_filename File "<frozen zipimport>", line 760, in _get_module_code File "<frozen zipimport>", line 689, in _compile_source File "D:\python\python3.10.7\lib\site-packages\beautifulsoup4-4.3.2-py3.10.egg\bs4\__init__.py", line 175 except Exception, e: ^^^^^^^^^^^^ SyntaxError: multiple exception types must be parenthesized

2023-05-05 上传
这个错误是因为你的代码使用了 Python 2.x 的语法，而你正在使用 Python 3.x 运行它。在 Python 3.x 中，抛出异常时，多个异常类型必须用圆括号括起来。你需要将代码中所有的 except 语句修改为以下格式： ``` ...

# Error: RuntimeError: file <maya console> line 7: setAttr: The attribute 'defaultTextureList1.textures' may not be unlocked. It is an unpublished attribute on a locked container.

2023-06-07 上传
```python cmds.lockNode('your_container_node', lock=False, lockUnpublished=False) ``` 在这里，您需要将“your_container_node”替换为实际的容器节点名称。请注意，这将解锁整个容器，包括其所有属性。 2. ...

{ "errorCode": 1, "errorMessage": "Traceback (most recent call last):\n File \"/var/runtime/python3/bootstrap.py\", line 133, in init_handler\n func_handler = get_func_handler(file.rsplit(\".\", 1)[0], func)\n File \"/var/runtime/python3/bootstrap.py\", line 159, in get_func_handler\n mod = imp.load_module(mname, *imp.find_module(mname))\n File \"/var/lang/python3/lib/python3.6/imp.py\", line 234, in load_module\n return load_source(name, filename, file)\n File \"/var/lang/python3/lib/python3.6/imp.py\", line 172, in load_source\n module = _load(spec)\n File \"Ϗrozen; importlib._bootstrap>\", line 675, in _load\n File \"Ϗrozen; importlib._bootstrap>\", line 655, in _load_unlocked\n File \"Ϗrozen; importlib._bootstrap_external>\", line 678, in exec_module\n File \"Ϗrozen; importlib._bootstrap>\", line 205, in _call_with_frames_removed\n File \"/var/user/index.py\", line 22, in <module;>\n from lxml import etree\nImportError: /var/user/lxml/etree.so: undefined symbol: _Py_ZeroStruct", "requestId": "00bfc1b3-cc94-4b90-9275-478dc7d982f8", "statusCode": 443

2023-02-06 上传
这是一个程序运行错误的信息，其中包含了错误代码1和错误消息"Traceback"。... 根据这个错误信息可以看出，错误发生在文件"/var/runtime/python3/bootstrap.py"的第133行，错误原因是在试图加载模块时出错。

Traceback (most recent call last): File "/usr/bin/yum", line 57, in <module> from dnf.cli import main File "/usr/lib/python3.6/site-packages/dnf/__init__.py", line 23, in <module> import dnf.pycomp File "/usr/lib/python3.6/site-packages/dnf/pycomp.py", line 24, in <module> import email.mime.text File "/usr/lib64/python3.6/email/mime/text.py", line 10, in <module> from email.mime.nonmultipart import MIMENonMultipart File "/usr/lib64/python3.6/email/mime/nonmultipart.py", line 10, in <module> from email.mime.base import MIMEBase File "/usr/lib64/python3.6/email/mime/base.py", line 9, in <module> import email.policy File "<frozen importlib._bootstrap>", line 971, in _find_and_load File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 665, in _load_unlocked File "<frozen importlib._bootstrap_external>", line 674, in exec_module File "<frozen importlib._bootstrap_external>", line 779, in get_code File "<frozen importlib._bootstrap_external>", line 487, in _compile_bytecode ValueError: bad marshal data (unknown type code)

2023-06-08 上传
这个错误可能是由于 Python 编译的字节码文件 (.pyc 文件) 损坏导致的。建议您尝试清空 Python 编译的缓存文件，具体方法如下： 1. 使用以下命令清空 Python 编译缓存： ``` find /usr/lib/python3.6/ -name "*....

Database /data/activemq/kahadb/lock is locked... waiting 10 seconds for the database to be unlocked. Reason: java.io.FileNotFoundException: /data/activemq/kahadb/lock (权限不够 ) | org.apache.activemq.store.SharedFileLocker | main

2023-05-30 上传
这个问题是由于权限不足导致的。在Linux系统中，文件和目录有着权限的概念，如果当前用户没有足够的权限，就会出现类似的错误。 为了解决这个问题，你需要查看当前用户是否具有对该目录的读写权限。...

maya python 获取对象在通道盒中显示的未锁定的属性的列表，其中属性被设置为不可设置关键帧

2023-06-08 上传
```python import maya.cmds as cmds # 选择你要获取属性列表的对象 selected_obj = cmds.ls(selection=True)[0] # 获取对象在通道盒中显示的所有属性 attr_list = cmds.listAttr(selected_obj, keyable=True) # ...

C:\Users\Lenovo\PycharmProjects\pythonProject\venv\Scripts\python.exe "C:/Program Files/JetBrains/PyCharm Community Edition 2022.3.2/plugins/python-ce/helpers/pydev/pydevd.py" --multiprocess --qt-support=auto --client 127.0.0.1 --port 53471 --file C:\Users\Lenovo\PycharmProjects\pythonProject\12306.py Connected to pydev debugger (build 223.8617.48) Traceback (most recent call last): File "<frozen importlib._bootstrap>", line 991, in _find_and_load File "<frozen importlib._bootstrap>", line 961, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed ModuleNotFoundError: No module named 'selenium' python-BaseException Process finished with exit code -1073741510 (0xC000013A: interrupted by Ctrl+C)

2023-06-09 上传
根据你提供的信息，这个错误提示是模块未找到错误，具体地说是找不到名为selenium的模块。这个错误可能是由于你的环境中没有安装selenium模块导致的。建议你通过pip安装selenium模块，命令如下： `pip install ...
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