Five interesting Python scripts

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.

The above is the detailed content of Five interesting Python scripts. For more information, please follow other related articles on the PHP Chinese website!