Take screenshot with python-adb and save it to a file

test_adb.py

import os
from adb import adb_commands
from adb import sign_m2crypto

# Devices running KitKat or later require auth
signer = sign_m2crypto.M2CryptoSigner(
    os.path.expanduser('~/.android/adbkey'))

# Connect to the device
device = adb_commands.AdbCommands()
device.ConnectDevice(
    rsa_keys=[signer])

# Open file with binary writing flags and take screenshot
with open('file.png', 'wb') as file:
    conn = device.protocol_handler.Open(
        device._handle,
        "shell:screencap -p".encode('utf8'),
    )

    for data in conn.ReadUntilClose():
        file.write(data)
        
    file.close()