你写过哪些实用的Python代码？

Python这门语言很适合用来写些实用的小脚本，跑个自动化、爬虫、算法什么的，非常方便。

这也是很多人学习Python的乐趣所在，可能只需要花个礼拜入门语法，就能用第三方库去解决实际问题。我在Github上就看到过不少Python代码的项目，几十行代码就能实现一个场景功能，非常实用。

比方说仓库Python-master里的几个简单例子：

1、创建二维码

import pyqrcode
import png
from pyqrcode import QRCode

# Text which is to be converted to QR code
print(\"Enter text to convert\")
s = input(\": \")
# Name of QR code png file
print(\"Enter image name to save\")
n = input(\": \")
# Adding extension as .pnf
d = n + \".png\"
# Creating QR code
url = pyqrcode.create(s)
# Saving QR code as  a png file
url.show()
url.png(d, scale=6)

2、从图片中截取文字

作者：朱卫军
链接：https://www.zhihu.com/question/282627359/answer/2521994250
来源：知乎
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。

# extract text from a img and its coordinates using the pytesseract module
import cv2
import pytesseract

# You need to add tesseract binary dependency to system variable for this to work

img = cv2.imread(\"img.png\")
# We need to convert the img into RGB format
img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)

hI, wI, k = img.shape
print(pytesseract.image_to_string(img))
boxes = pytesseract.image_to_boxes(img)
for b in boxes.splitlines():
    b = b.split(\" \")
    x, y, w, h = int(b[1]), int(b[2]), int(b[3]), int(b[4])
    cv2.rectangle(img, (x, hI - y), (w, hI - h), (0, 0, 255), 0.2)

cv2.imshow(\"img\", img)
cv2.waitKey(0)

3、判断闰年

def is_leap(year):
    leap = False
    if year % 4 == 0:
        leap = True
        if year % 100 == 0:
            leap = False
            if year % 400 == 0:
                leap = True
    return leap


year = int(input(\"Enter the year here: \"))
print(is_leap(year))

4、简易日历

作者：朱卫军
链接：https://www.zhihu.com/question/282627359/answer/2521994250
来源：知乎
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。

from tkinter import *
import calendar

root = Tk()
# root.geometry(\"400x300\")
root.title(\"Calendar\")

# Function

def text():
    month_int = int(month.get())
    year_int = int(year.get())
    cal = calendar.month(year_int, month_int)
    textfield.delete(0.0, END)
    textfield.insert(INSERT, cal)


# Creating Labels
label1 = Label(root, text=\"Month:\")
label1.grid(row=0, column=0)

label2 = Label(root, text=\"Year:\")
label2.grid(row=0, column=1)

# Creating spinbox
month = Spinbox(root, from_=1, to=12, width=8)
month.grid(row=1, column=0, padx=5)

year = Spinbox(root, from_=2000, to=2100, width=10)
year.grid(row=1, column=1, padx=10)

# Creating Button
button = Button(root, text=\"Go\", command=text)
button.grid(row=1, column=2, padx=10)

# Creating Textfield
textfield = Text(root, width=25, height=10, fg=\"red\")
textfield.grid(row=2, columnspan=2)


root.mainloop()

5、打印图片分辨率

作者：朱卫军
链接：https://www.zhihu.com/question/282627359/answer/2521994250
来源：知乎
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。

def jpeg_res(filename):
   \"\"\"\"This function prints the resolution of the jpeg image file passed into it\"\"\"

   # open image for reading in binary mode
   with open(filename,\'rb\') as img_file:

       # height of image (in 2 bytes) is at 164th position
       img_file.seek(163)

       # read the 2 bytes
       a = img_file.read(2)

       # calculate height
       height = (a[0] << 8) + a[1]

       # next 2 bytes is width
       a = img_file.read(2)

       # calculate width
       width = (a[0] << 8) + a[1]

   print(\"The resolution of the image is\",width,\"x\",height)

jpeg_res(\"img1.jpg\")

这个项目只是作者平时工作用到的一些小脚本，可能也会帮助到你。作者虽然不是程序员，但他这种用代码解决问题的习惯会极大的提升效率，也会迸发出更多的创新思维。我觉得这样的代码每个人都可以写出来，只要慢慢积累多练习就可以。

来源：https://www.cnblogs.com/liuliumei/p/16858083.html
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