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Description:

pytwain 2.3.0

pytwain
This library allows acquiring images from various sources that support TWAIN protocol, e.g. scanners.
To install this library run:
pip install pytwain

Once installed you can run following sample Python script to acquire an image:
from io import BytesIO
import twain
import tkinter
from tkinter import ttk
import logging
import PIL.ImageTk
import PIL.Image

scanned_image = None

def scan():
global scanned_image
with twain.SourceManager(root) as sm:
# this will show UI to allow user to select source
src = sm.open_source()
if src:
src.request_acquire(show_ui=False, modal_ui=False)
(handle, remaining_count) = src.xfer_image_natively()
bmp_bytes = twain.dib_to_bm_file(handle)
img = PIL.Image.open(BytesIO(bmp_bytes), formats=["bmp"])
width, height = img.size
factor = 600.0 / width
# Storing PhotoImage in global variable to prevent it from being deleted once this function exits
# since PhotoImage has a __del__ destructor
scanned_image = PIL.ImageTk.PhotoImage(img.resize(size=(int(width * factor), int(height * factor))))
frm.destroy()
ttk.Label(root, image=scanned_image).pack(side="left", fill="both", expand=1)
else:
print("User clicked cancel")

logging.basicConfig(level=logging.DEBUG)
root = tkinter.Tk()
frm = ttk.Frame(root, padding=10)
frm.grid()
ttk.Button(frm, text="Scan", command=scan).grid(column=0, row=0)
root.mainloop()

Full documentation for the library located here.
This library uses ctypes to access TWAIN API, therefore it does not require compilation and can work with Pypi.
References

https://twain.org/
http://pytwain.readthedocs.org/