NumPy是Python专用于矩阵计算的包,底层函数主要用C语言编写。NumPy还是众多数据处理包的基石,比如 pandas 和 Sciki-Learn。 可见,想学好Python数据分析和机器学习,必须掌握NumPy。 我们先比较下NumPy和Python传统的数据运算,看两者的效率差别。 import numpy as np import time ## 列表运算 start = time.time() #...
简介: CheatSheet:Python快速参考 Python sys Variables Python sys.argv sys.argv for the command: $ python foo.py bar -c qux --h Python os Variables Registered OS names: “posix”, “nt”, “mac”, “os2”, “ce”, “java”, “riscos...
Year (2008) %Z Time zone (GMT) %% A literal "%" character (%) ¹ Sunday as start of week. All days in a new year preceding the first Sunday are considered to be in week 0. ² 0 is Sunday, 6 is Saturday. ³ Monday as start of week. All days in a new year precedin...
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环境管理:可以方便地安装各种版本python、各种package、创建虚拟环境并快速切换; 文档:https://conda.io/docs/index.html Getting started:https://conda.io/docs/user-guide/getting-started.html Conda cheat sheet:https://conda.io/docs/_downloads/conda-cheatsheet.pdfAnaconda...
Free Bonus:Click here to get our itertools cheat sheetthat summarizes the techniques demonstrated in this tutorial.
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PDF Portrait version 8.5 x 11" of this cheatsheet is available atPL/Python Cheatsheet 8.5 x 11and also available inPDF A4 formatandHTML. Also check out our accompanying tutorials on the topic of PL/Python: Quick Intro to PLPython PLPython Part 2: Control Flow and Returning Sets ...