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Data Analysis

Pandas, Numpy https://towardsdatascience.com/a-comprehensive-guide-to-the-grammar-of-graphics-for-effective-visualization-of-multi-dimensional-1f92b4ed4149

如何掌握資料: 建立、量測長度、調整大小寫、去除多餘空格、格式化輸出、擷取部分文字、轉換為日期時間格式、根據特徵分隔、判斷特徵存在與否及存在位置、根據特徵取代、正規表達特徵以及應用文字處理函數至陣列上

Create Data Science Project from Scratch

Statistics Prediction: School Performance vs Income Linear Regression Intro Regression

零售採購 Retail Procurement America Land Use

Matplotlib 分析資料 Dash Gapminder Datalab + BigQuery Consecutive Numbers: more_itertools Visualization Tools Animated Chart by R Analyzing Trump Tweet Spotify Data Retrieve Stream Twitter Data to MySQL

Visualization

Matplotlib Guide

Pandas

Data Clean: Missing Values Code Example Udemy: Data Analysis  Pandas Cheat Sheet Quick Dive Complete Tutorial to Learn Data Science from Scratch Nick Eubank Useful Snippets Pandas Snippets 範例教學 Scrape Weather Data with Pandas Pandas Dataframe as a Process Tracker (postgres example) Udemy

編號保留 0 符號 編號採 int 形態的話,不能是空值,變通方式是採 float 形態。

Pandas Basics Broadcasting Reshaping Pivot Table

指定 Excel 欄位的資料型別 Split a Column into Two

10 Minutes to Pandas

dates = pd.date_range('20130101', periods=6)
df = pd.DataFrame(np.random.randn(6,4), index=dates, columns=list('ABCD'))

String Processing Methods

Balance Tasks between Pandas and PostgreSQL

NBA Practical Medium Data Analytics with Python (10 Things I Hate About Pandas) Geospatial Analysis 37:30 Filtering on Geodesic Features

GeoPandas + Leaflet: 與既有工具合作 GeoPandas GIF ArcGIS QGIS PostGIS D3 https://medium.com/@ryan.stewart113/geopandas-101-plot-any-data-with-a-latitude-and-longitude-on-a-map-98e01944b972

Bokeh vs Dash Data Cleaning

Geographic Statistical Data with Google Maps

SQL for Mode Analytics

Numpy

Beautiful Code with NumPy Introduction to Data Analytics with Pandas

常態分配亂數 s = np.random.normal(100, 5, 100) 平均數, 標準差, 個數

b = s.astype(int) 轉成整數

b = b.clip(0, 100) 大於 100 則改為 100 小於 0 則改為 0

series = pd.Series(np.random.rand(n))
series = pd.Series(np.random.randint(1, 5, n))
series = pd.Series(np.random.randint(1, 5, n), dtype=np.float64)
series = pd.Series(np.random.randint(1, 5, n), dtype=np.float64, index=[n*x for x in range(n)])
series = pd.Series(np.random.randint(1, 100, n), dtype=np.float64, index=list('ABCDEFGHIJKLMNOPQRSTUVWXYZ')[:n])

Circular binary structure for SciPy morphological operations

import numpy as np
 
def circular_structure(radius):
    size = radius*2+1
    i,j = np.mgrid[0:size, 0:size]
    i -= (size/2)
    j -= (size/2)
    return np.sqrt(i**2+j**2) <= radius="" pre="">

eliminate double loop

In [1]: import numpy as np
In [2]: a = np.zeros((1, 2, 3))
In [3]: a.shape
Out[3]: (1, 2, 3)
In [4]: a_sum = a.sum(axis=-1)
In [5]: a_sum.shape
Out[5]: (1, 2)

把最後一個axis黏起來了

In [6]: a_sum0 = a.sum(axis=0)
In [7]: a_sum0.shape
Out[7]: (2, 3)

SciPy

只 import scipy 是拿不到 io 這個 submodule 要用 from .... import 才拿得到,背後機制好玩。

Numba

Better Performance

Dask https://towardsdatascience.com/why-every-data-scientist-should-use-dask-81b2b850e15b

PyTubes

Analysing 1.4 billion rows with Python

PySpark

Multi-Class Text Classification

NLP

NLP Fun 100-times-faster-natural-language-processing-in-python

allenai/allennlp Neo4j https://medium.com/vectrconsulting/build-your-own-knowledge-graph-975cf6dde67f