[Python] 對以Dictionary or Class為item的List做Sort

[Python] 對以Dictionary or Class為item的List做Sort

[python] Remove duplicate items from a list using set

How to remove repeated item in array / list in python?
http://love-python.blogspot.tw/2008/09/remove-duplicate-items-from-list-using.html

random integer array

np.random.randint(_random_within_this_value, size(_row, _column))

output: _row*_column 的 random integer array

[python] 模組 __name__, ...

http://caterpillar.onlyfun.net/Gossip/Python/ModuleABC.html

[python] 轉置矩陣 transpose matrix

wT = zip(*w)

[python] 矩陣向量相乘

Vector Matrix multiplication in python 裡的 最佳解答 matrix-times-vector multiplication 很猛!

[python] legendre polonomial

要產生像 legendre polonomial 這樣的 Pn(x)

要使用 scipy

scipy.special.legendre(n)

[python] sign(x) - 傳回 x 的正負值

要馬是
import numpy as np
np.sign(x)

不然也有內建函式
利用 math.copysign(1, y) 可以傳回 y 的正負值

不用 x / abs(x)

[python] random non-repeating sequence

random.sample(population, k)

[python] pass by reference or value 參數是傳參考還是傳值?

Referencing: Python: How do I pass a variable by reference, Passing values in Python
其實重點是在 data type. 

到底在寫 function 的時候，傳的參數 (argument, parameter) 是 reference or value?

全部都是passes references-to-objects by value (like Java), 只是 mutable data type would act like pass by reference

[python] find, search something in an numpy array

Stackoverflow - Python: Numpy array help. Is there a function to return the index of something in an array?

[python] remove a newline \n

>>> 'test string \n'.rstrip('\n')
'test string '

[python] how-to-plot-cdf-in-matplotlib-in-python

Referencing how-to-plot-cdf-in-matplotlib-in-python

[python] Parsing, Decoding, Read json

Referencing: parsing json python, python json decoding
These two article should be clear enough! 這兩篇應該就蠻清楚的了!

* JSON objects behave like dictionaries, JSON format is a list containing objects
-> access object by json[object], and len(json) would get the length of json
-> using iterator on a dictionary, hence can be used on json format.
get keys by simple dict.keys(), get values by simple dict.values()
http://www.python.org/dev/peps/pep-3106/

[python] matplotlib.pyplot point and line styles

[優] plt.examples    http://hyry.dip.jp:8000/pydoc/matplotlib_intro.html

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