Python can be used in many directions, such as crawlers, predictive analysis, GUI, automation, image processing, visualization, etc. It may only take a dozen lines of code to achieve cool functions.
Because Python is a dynamic scripting language, the code logic is much simpler than Java, and a lot less code is needed to achieve the same function. Moreover, the Python ecosystem has many third-party tool libraries that encapsulate functions in packages. You only need to call the interface to use complex functions.
Here are a few simple and fun script examples. Beginners can follow the code and quickly master python syntax.
1. Use PIL, Matplotlib, and Numpy to repair blurry old photos
import numpy as np import matplotlib.pyplot as plt from PIL import Image import os.path img_path = "E:\test.jpg" img = Image.open(img_path) img = np.asarray(img) flat = img.flatten() def get_histogram(image, bins): histogram = np.zeros(bins) for pixel in image: histogram[pixel] += 1 return histogram hist = get_histogram(flat, 256) cs = np.cumsum(hist) nj = (cs - cs.min()) * 255 N = cs.max() - cs.min() cs = nj / N cs = cs.astype('uint8') img_new = cs[flat] img_new = np.reshape(img_new, img.shape) fig = plt.figure() fig.set_figheight(15) fig.set_figwidth(15) fig.add_subplot(1, 2, 1) plt.imshow(img, cmap='gray') plt.title("Image 'Before' Contrast Adjustment") fig.add_subplot(1, 2, 2) plt.imshow(img_new, cmap='gray') plt.title("Image 'After' Contrast Adjustment") filename = os.path.basename(img_path) plt.show()
2. Compress files in batches and use the zipfile library
import os import zipfile from random import randrange def zip_dir(path, zip_handler): for root, dirs, files in os.walk(path): for file in files: zip_handler.write(os.path.join(root, file)) if __name__ == '__main__': to_zip = input(""" Enter the name of the folder you want to zip (N.B.: The folder name should not contain blank spaces) > """) to_zip = to_zip.strip() + "/" zip_file_name = f'zip{randrange(0,10000)}.zip' zip_file = zipfile.ZipFile(zip_file_name, 'w', zipfile.ZIP_DEFLATED) zip_dir(to_zip, zip_file) zip_file.close() print(f'File Saved as {zip_file_name}')
3. Use tkinter to make a calculator GUI
tkinter is python’s own GUI library, suitable for beginners to practice creating small software
import tkinter as tk root = tk.Tk() root.title("Standard Calculator") root.resizable(0, 0) e = tk.Entry(root, width=35, bg='#f0ffff', fg='black', borderwidth=5, justify='right', font='Calibri 15') e.grid(row=0, column=0, columnspan=3, padx=12, pady=12) def buttonClick(num): temp = e.get( ) e.delete(0, tk.END) e.insert(0, temp + num) def buttonClear(): e.delete(0, tk.END)
4. Convert PDF to Word file
Use the pdf2docx library to convert PDF files to Word format
from pdf2docx import Converter import os import sys pdf = input("Enter the path to your file: ") assert os.path.exists(pdf), "File not found at, "+str(pdf) f = open(pdf,'r+') doc_name_choice = input("Do you want to give a custom name to your file ?(Y/N)") if(doc_name_choice == 'Y' or doc_name_choice == 'y'): doc_name = input("Enter the custom name : ")+".docx" else: pdf_name = os.path.basename(pdf) doc_name =os.path.splitext(pdf_name)[0] + ".docx" cv = Converter(pdf) path = os.path.dirname(pdf) cv.convert(os.path.join(path, "", doc_name) , start=0, end=None) print("Word doc created!") cv.close()
5. Python automatically sends emails
This can be achieved using smtplib and email libraries Script sends email.
import smtplib import email from email.mime.text import MIMEText from email.mime.image import MIMEImage from email.mime.multipart import MIMEMultipart from email.header import Header mail_host = "smtp.163.com" mail_sender = "******@163.com" mail_license = "********" mail_receivers = ["******@qq.com","******@outlook.com"] mm = MIMEMultipart('related') subject_content = """Python邮件测试""" mm["From"] = "sender_name<******@163.com>" mm["To"] = "receiver_1_name<******@qq.com>,receiver_2_name<******@outlook.com>" mm["Subject"] = Header(subject_content,'utf-8') body_content = """你好,这是一个测试邮件!""" message_text = MIMEText(body_content,"plain","utf-8") mm.attach(message_text) image_data = open('a.jpg','rb') message_image = MIMEImage(image_data.read()) image_data.close() mm.attach(message_image) atta = MIMEText(open('sample.xlsx', 'rb').read(), 'base64', 'utf-8') atta["Content-Disposition"] = 'attachment; filename="sample.xlsx"' mm.attach(atta) stp = smtplib.SMTP() stp.connect(mail_host, 25) stp.set_debuglevel(1) stp.login(mail_sender,mail_license) stp.sendmail(mail_sender, mail_receivers, mm.as_string()) print("邮件发送成功") stp.quit()
Summary
Python also has many fun little scripts. You can write them according to your own scenarios, or you can use Ready-made third-party libraries.
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