广东工业大学《Python基础》第7章 模块、包和库.pptxVIP

第7章模块、包和库;内容;7.1概述;7.1概述;7.2常用标准库模块;7.2.1Turtle;7.2.1Turtle;7.2.1Turtle;7.2.1Turtle;7.2.1Turtle;7.2.1Turtle;7.2.1Turtle;7.2.2Random;7.2.2Random;7.2.2Random;7.2.2Random;7.2.2Random;7.2.2Random;7.2.2Random;7.2.3Time和Datetime;7.2.3Time和Datetime;7.2.3Time和Datetime;7.2.3Time和Datetime;7.2.3Time和Datetime;7.2.3Time和Datetime;7.2.3Time和Datetime;7.2.4Os;7.2.4Os;7.2.4Os;7.2.4Os;7.2.4Os;7.2.4Os;7.2.4Os;7.2.5Sys;7.2.6Timeit;7.2.6Timeit;【例7.21】使用Zlib模块对字符串进行压缩和解压缩。

程序代码：

importzlib

str=bWhatisyourname?Whatisyourname?Whatisyourname?

print(压缩前:%s,字符个数%d.%(str,len(str)))

str_com=press(str)

print(压缩后:%s,字符个数%d.%(str_com,len(str_com)))

str_dec=zlib.decompress(str_com)

print(解压后:%s,字符个数%d.%(str_dec,len(str_dec)))

;运行结果：

压缩前:bWhatisyourname?Whatisyourname?Whatisyourname?,字符个数56.

压缩后:bx\x9c\x0b\xcfH,Q\xc8,V\xa8\xcc/-

R\xc8K\xccM\xb5\x0f\xc7\x10Q\xc0\

x14\x02\x00(\x11\x13\x9e,字符个数30.

解压后:bWhatisyourname?Whatisyourname?Whatisyourname?,字符个数56.

;7.3常用第三方库;7.3.1NumPy;7.3.1NumPy;7.3.1NumPy;7.3.1NumPy;7.3.1NumPy;7.3.1NumPy;NumPy数组与C++数组

a=np.arange(24).reshape(2,3,4)

print(a)

[[[0123]

[4567]

[891011]]

[[12131415]

[16171819]

[20212223]]];7.3.1NumPy;7.3.1NumPy;7.3.1NumPy;7.3.1NumPy;7.3.1NumPy;7.3.1NumPy;7.3.2Pandas;7.3.2Pandas;7.3.2Pandas;7.3.2Pandas;7.3.2Pandas;7.3.2Pandas;7.3.2Pandas;7.3.2Pandas;7.3.3SciPy;7.3.3SciPy;7.3.3SciPy;7.3.3SciPy;7.3.3SciPy;7.3.3SciPy;7.3.4Matplotlib;7.3.4Matplotlib;7.3.4Matplotlib;7.3.4Matplotlib;7.3.4Matplotlib;7.3.4Matplotlib;7.3.4Matplotlib;7.3.4Matplotlib;7.3.4Matplotlib;7.3.4Matplotlib;7.3.4Matplotlib;7.3.5Jieba;7.3.5Jieba;7.3.5Jieba;7.3.5Jieba;7.3.5Jieba;7.3.5Jieba;7.3.5Jieba;7.3.5Jieba;7.3.6PyInstaller;7.3.6PyInstaller;7.3.6PyInstaller;7.3.6PyInstaller;7.3.6PyInstaller;7.4自定义模块;7.4自定义模块;7.4自定义模块;7.4