20170129_python_Python程式設計實務_練習小記

20170129_python_Python程式設計實務_練習小記

Github: 

https://github.com/sakanamax/LearnPython/tree/master/books/Python%E7%A8%8B%E5%BC%8F%E8%A8%AD%E8%A8%88%E5%AF%A6%E5%8B%99_%E5%8D%9A%E7%A2%A9

Client: openSUSE Leap 42.2 with vi and PyCharm

昨天練習相關檔案

檔案: 2-3.py

# 匯入 requests

import requests

# 透過 requests.get 去抓 民視的網頁

www = requests.get( "http://m.ftv.com.tw/newslist.aspx?class=L" )

# 如果使用 print( www ) 會得到 網頁回覆, 例如 200

# 所以如果要列出網頁內容使用書上的 print( www.text )

print( www )

print( "=========================================" )

print( www.text )

檔案: 3-1.py

a, b = 2, 3

# 列出 a 以及 b

print( a, b)

# 將 a 與 b 交換

a, b = b, a

print( a, b)

檔案: 3-2.py

# 書上的作法是 a = range(5), 他其實是要列出 list 0 到 4

# 這個時候 print( a ) 在 python 3, 會出現 range(0, 5)

# 所以 python3 內的寫法, 如果要使用 a = range(5)來列出 list 0 - 4, 應該是 print( list(a) )

# 所以將程式碼改為

# 註解寫了中文在 python 好像就會產生 error, 先無視他吧

a = list( range(4) )

#print( a )

#print( list(a) )

# 同理可證 b

b = list( range(10, 15) )

# 不然 c = a + b 在 python 3 就會出現錯誤

c = a + b

print( "List a", a )

print( "List b", b )

print( "List a + List b", c )

Chapter 4

確認是否有安裝相關模組

主要練習為 python 3 版本

# zypper   search  numPy

Loading repository data...

Reading installed packages...

S | Name                     | Summary                              | Type      

--+--------------------------+--------------------------------------+-----------

  | python-numpy             | NumPy array processing for numbers-> | srcpackage

i | python-numpy             | NumPy array processing for numbers-> | package   

  | python3-numpy            | NumPy array processing for numbers-> | package   

# zypper   search   python3-matplo

Loading repository data...

Reading installed packages...

S | Name                         | Summary                                                 | Type   

--+------------------------------+---------------------------------------------------------+--------

  | python3-matplotlib           | Plotting Library for Python                             | package

預設沒有安裝 python3 的 numpy 以及 matplotlib 模組

安裝相關模組

# zypper   install   python3-matplotlib   python3-numpy

Loading repository data...

Reading installed packages...

Resolving package dependencies...

The following 16 NEW packages are going to be installed:

  libwebpmux1 python-Cycler python-Pillow python-functools32 python-matplotlib python-matplotlib-tk python-pyparsing

  python-python-dateutil python-pytz python-tk python3-dateutil python3-matplotlib python3-numpy python3-pyparsing

  python3-pytz python3-six

The following 2 recommended packages were automatically selected:

  python-Pillow python-matplotlib-tk

16 new packages to install.

Overall download size: 79.1 MiB. Already cached: 0 B. After the operation, additional 154.7 MiB will be used.

Continue? [y/n/? shows all options] (y): Y

檔案: 4-1.py

# -*- coding: utf-8 -*-

# 目前沒有成功, 圖形介面沒有顯示, 後續再來研究

import numpy as np

import matplotlib.pyplot as pt

x = np.arange(0, 360)

y = np.sin(x * np.pi / 180.0)

pt.plot(x, y)

pt.xlim(0, 360)

pt.ylim(-1.2, 1.2)

pt.title("SIN function")

pt.show()

今天先這樣

~ enjoy it