2 Python Project Ideas for Beginners

1. Text Detection and Extraction using OpenCV and OCR.

OpenCV (Open source computer vision) is a library mainly aimed at real-time computer vision, in python it helps to process an image and apply various functions e.g. pixel manipulations, object detection, etc. For this project using contours to detect the text in an image and save it to a text file.

Requirements

<span>conda</span> <span>install</span> <span>-</span><span>c</span> <span>conda</span><span>-</span><span>forge</span> <span>opencv</span>
<span>conda</span> <span>install</span> <span>-</span><span>c</span> <span>conda</span><span>-</span><span>forge</span> <span>pytesseract</span>
<span>conda</span> <span>install</span> <span>-</span><span>c</span> <span>conda</span><span>-</span><span>forge</span> <span>opencv</span>
<span>conda</span> <span>install</span> <span>-</span><span>c</span> <span>conda</span><span>-</span><span>forge</span> <span>pytesseract</span>
conda install -c conda-forge opencv
conda install -c conda-forge pytesseract

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Coding

I will use the following sample image:

<span>import</span> <span>cv2</span>
<span>import</span> <span>numpy</span> <span>as</span> <span>np</span>
<span>import</span> <span>pytesseract</span> <span>as</span> <span>pyt</span>
<span>image</span> <span>=</span> <span>cv2</span><span>.</span><span>imread</span><span>(</span><span>'</span><span>The_Zen_of_Python.jpeg</span><span>'</span><span>)</span>
<span># image convertion to grey scale </span><span>image_gray</span> <span>=</span> <span>cv2</span><span>.</span><span>cvtColor</span><span>(</span><span>image</span><span>,</span> <span>cv2</span><span>.</span><span>COLOR_BGR2GRAY</span><span>)</span>
<span>image_gray</span><span>,</span> <span>binary_image</span> <span>=</span> <span>cv2</span><span>.</span><span>threshold</span><span>(</span><span>image_gray</span><span>,</span> <span>128</span><span>,</span><span>255</span><span>,</span> <span>cv2</span><span>.</span><span>THRESH_BINARY</span><span>)</span>
<span>image_gray</span> <span>=</span><span>cv2</span><span>.</span><span>bitwise_not</span><span>(</span><span>binary_image</span><span>)</span>
<span>kernel</span> <span>=</span> <span>np</span><span>.</span><span>ones</span><span>((</span><span>2</span><span>,</span><span>1</span><span>),</span> <span>np</span><span>.</span><span>uint8</span><span>)</span>
<span>image</span> <span>=</span> <span>cv2</span><span>.</span><span>erode</span><span>(</span><span>image_gray</span><span>,</span> <span>kernel</span><span>,</span><span>iterations</span> <span>=</span> <span>1</span><span>)</span>
<span>image</span> <span>=</span> <span>cv2</span><span>.</span><span>dilate</span><span>(</span><span>image_gray</span><span>,</span> <span>kernel</span><span>,</span><span>iterations</span> <span>=</span> <span>1</span><span>)</span>
<span>import</span> <span>cv2</span>
<span>import</span> <span>numpy</span> <span>as</span> <span>np</span>
<span>import</span> <span>pytesseract</span> <span>as</span> <span>pyt</span>

<span>image</span> <span>=</span> <span>cv2</span><span>.</span><span>imread</span><span>(</span><span>'</span><span>The_Zen_of_Python.jpeg</span><span>'</span><span>)</span>

<span># image convertion to grey scale </span><span>image_gray</span> <span>=</span> <span>cv2</span><span>.</span><span>cvtColor</span><span>(</span><span>image</span><span>,</span> <span>cv2</span><span>.</span><span>COLOR_BGR2GRAY</span><span>)</span>
<span>image_gray</span><span>,</span> <span>binary_image</span> <span>=</span> <span>cv2</span><span>.</span><span>threshold</span><span>(</span><span>image_gray</span><span>,</span> <span>128</span><span>,</span><span>255</span><span>,</span> <span>cv2</span><span>.</span><span>THRESH_BINARY</span><span>)</span>
<span>image_gray</span> <span>=</span><span>cv2</span><span>.</span><span>bitwise_not</span><span>(</span><span>binary_image</span><span>)</span>

<span>kernel</span> <span>=</span> <span>np</span><span>.</span><span>ones</span><span>((</span><span>2</span><span>,</span><span>1</span><span>),</span> <span>np</span><span>.</span><span>uint8</span><span>)</span>
<span>image</span> <span>=</span> <span>cv2</span><span>.</span><span>erode</span><span>(</span><span>image_gray</span><span>,</span> <span>kernel</span><span>,</span><span>iterations</span> <span>=</span> <span>1</span><span>)</span>
<span>image</span> <span>=</span> <span>cv2</span><span>.</span><span>dilate</span><span>(</span><span>image_gray</span><span>,</span> <span>kernel</span><span>,</span><span>iterations</span> <span>=</span> <span>1</span><span>)</span>
import cv2
import numpy as np
import pytesseract as pyt

image = cv2.imread('The_Zen_of_Python.jpeg')

# image convertion to grey scale image_gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
image_gray, binary_image = cv2.threshold(image_gray, 128,255, cv2.THRESH_BINARY)
image_gray =cv2.bitwise_not(binary_image)

kernel = np.ones((2,1), np.uint8)
image = cv2.erode(image_gray, kernel,iterations = 1)
image = cv2.dilate(image_gray, kernel,iterations = 1)

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The next code will convert the image into a string and print the string as text.

<span># image conversion into string </span><span>image_text</span> <span>=</span> <span>pyt</span><span>.</span><span>image_to_string</span><span>(</span><span>image</span><span>)</span>
<span>print</span><span>(</span><span>image_text</span><span>)</span>
<span># image conversion into string </span><span>image_text</span> <span>=</span> <span>pyt</span><span>.</span><span>image_to_string</span><span>(</span><span>image</span><span>)</span>

<span>print</span><span>(</span><span>image_text</span><span>)</span>
# image conversion into string image_text = pyt.image_to_string(image)

print(image_text)

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Check out the video of the project above –Project video

2. Stock Price Visualisation using Yahoo’s yfinance .

yfinance is an open source library developed by Ran Aroussi as a means to access the financial data available on Yahoo Finance.

Yahoo Finance offers a wide range of market data on stocks, bonds, currencies and cryptocurrencies. In addition it offers market news, reports and analysis and fundamentals data- setting it apart from some of it’s competitors.

Requirements

<span>pip</span> <span>install</span> <span>yfinance</span>
<span>conda</span> <span>install</span> <span>-</span><span>c</span> <span>conda</span><span>-</span><span>forge</span> <span>pandas</span>
<span>pip</span> <span>install</span> <span>plotly</span><span>-</span><span>express</span>
<span>pip</span> <span>install</span> <span>yfinance</span>
<span>conda</span> <span>install</span> <span>-</span><span>c</span> <span>conda</span><span>-</span><span>forge</span> <span>pandas</span>
<span>pip</span> <span>install</span> <span>plotly</span><span>-</span><span>express</span>
pip install yfinance
conda install -c conda-forge pandas
pip install plotly-express

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Coding

<span>import</span> <span>yfinance</span> <span>as</span> <span>yf</span>
<span>import</span> <span>pandas</span> <span>as</span> <span>pd</span>
<span>import</span> <span>datetime</span> 
<span>from</span> <span>datetime</span> <span>import</span> <span>date</span><span>,</span> <span>timedelta</span>
<span>today</span> <span>=</span> <span>date</span><span>.</span><span>today</span><span>()</span>
<span>date1</span> <span>=</span> <span>today</span><span>.</span><span>strftime</span><span>(</span><span>"</span><span>%Y-%m-%d</span><span>"</span><span>)</span>
<span>end_date</span> <span>=</span> <span>date1</span>
<span>date2</span> <span>=</span> <span>date</span><span>.</span><span>today</span><span>()</span> <span>-</span><span>timedelta</span><span>(</span><span>days</span> <span>=</span> <span>365</span><span>)</span>
<span>date2</span> <span>=</span> <span>date2</span><span>.</span><span>strftime</span><span>(</span><span>"</span><span>%Y-%m-%d</span><span>"</span><span>)</span>
<span>start_date</span> <span>=</span> <span>date2</span> 
<span>data</span> <span>=</span> <span>yf</span><span>.</span><span>download </span><span>(</span> <span>'</span><span>AAPL</span><span>'</span><span>,</span> 
    <span>start</span> <span>=</span> <span>start_date</span><span>,</span> 
    <span>end</span> <span>=</span> <span>end_date</span><span>,</span>
    <span>progress</span> <span>=</span> <span>False</span><span>)</span>
<span>print</span><span>(</span><span>data</span><span>[:</span><span>10</span><span>])</span>
<span>import</span> <span>yfinance</span> <span>as</span> <span>yf</span>
<span>import</span> <span>pandas</span> <span>as</span> <span>pd</span>
<span>import</span> <span>datetime</span> 
<span>from</span> <span>datetime</span> <span>import</span> <span>date</span><span>,</span> <span>timedelta</span>

<span>today</span> <span>=</span> <span>date</span><span>.</span><span>today</span><span>()</span>

<span>date1</span> <span>=</span> <span>today</span><span>.</span><span>strftime</span><span>(</span><span>"</span><span>%Y-%m-%d</span><span>"</span><span>)</span>
<span>end_date</span> <span>=</span> <span>date1</span>

<span>date2</span> <span>=</span> <span>date</span><span>.</span><span>today</span><span>()</span> <span>-</span><span>timedelta</span><span>(</span><span>days</span> <span>=</span> <span>365</span><span>)</span>
<span>date2</span> <span>=</span> <span>date2</span><span>.</span><span>strftime</span><span>(</span><span>"</span><span>%Y-%m-%d</span><span>"</span><span>)</span>
<span>start_date</span> <span>=</span> <span>date2</span> 

<span>data</span> <span>=</span> <span>yf</span><span>.</span><span>download </span><span>(</span> <span>'</span><span>AAPL</span><span>'</span><span>,</span> 
    <span>start</span> <span>=</span> <span>start_date</span><span>,</span> 
    <span>end</span> <span>=</span> <span>end_date</span><span>,</span>
    <span>progress</span> <span>=</span> <span>False</span><span>)</span>
<span>print</span><span>(</span><span>data</span><span>[:</span><span>10</span><span>])</span>
import yfinance as yf
import pandas as pd
import datetime 
from datetime import date, timedelta

today = date.today()

date1 = today.strftime("%Y-%m-%d")
end_date = date1

date2 = date.today() -timedelta(days = 365)
date2 = date2.strftime("%Y-%m-%d")
start_date = date2 

data = yf.download ( 'AAPL', 
    start = start_date, 
    end = end_date,
    progress = False)
print(data[:10])

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Visualise your Stock price data using Plotly Express. This visualisation will prompt a new window to open in your browser with up todate data.

<span>import</span> <span>plotly.express</span> <span>as</span> <span>px</span> 
<span>fig</span> <span>=</span> <span>px</span><span>.</span><span>line</span><span>(</span><span>data</span><span>,</span> <span>x</span> <span>=</span> <span>data</span><span>.</span><span>index</span><span>,</span> 
                <span>y</span> <span>=</span> <span>"</span><span>Close</span><span>"</span><span>,</span> 
                <span>title</span> <span>=</span> <span>"</span><span>Stock Price data</span><span>"</span><span>)</span>
<span>fig</span><span>.</span><span>show</span><span>()</span>
<span>import</span> <span>plotly.express</span> <span>as</span> <span>px</span> 
<span>fig</span> <span>=</span> <span>px</span><span>.</span><span>line</span><span>(</span><span>data</span><span>,</span> <span>x</span> <span>=</span> <span>data</span><span>.</span><span>index</span><span>,</span> 
                <span>y</span> <span>=</span> <span>"</span><span>Close</span><span>"</span><span>,</span> 
                <span>title</span> <span>=</span> <span>"</span><span>Stock Price data</span><span>"</span><span>)</span>
<span>fig</span><span>.</span><span>show</span><span>()</span>
import plotly.express as px 
fig = px.line(data, x = data.index, 
                y = "Close", 
                title = "Stock Price data")
fig.show()

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原文链接：2 Python Project Ideas for Beginners