meigrafd Ich muss gestehen, dass ich erst mal nur nach dem richtigen Befehl zum Auslesen gesucht habe, weil ich dachte ich bekomme die Implementierung in Python selbst hin, aber dem ist wohl nicht so. 
Das komplette Script sieht jedenfalls so aus und da wo noch die IP-Adresse steht - da soll eigentlich der Network-Traffic hin.
import time
import Adafruit_GPIO.SPI as SPI
import Adafruit_SSD1306
from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont
import subprocess
# Raspberry Pi pin configuration:
RST = None # on the PiOLED this pin isnt used
# Note the following are only used with SPI:
DC = 23
SPI_PORT = 0
SPI_DEVICE = 0
# 128x32 display with hardware I2C:
disp = Adafruit_SSD1306.SSD1306_128_32(rst=RST)
# Initialize library.
disp.begin()
# Clear display.
disp.clear()
disp.display()
# Create blank image for drawing.
# Make sure to create image with mode '1' for 1-bit color.
width = disp.width
height = disp.height
image = Image.new('1', (width, height))
# Get drawing object to draw on image.
draw = ImageDraw.Draw(image)
# Draw a black filled box to clear the image.
draw.rectangle((0,0,width,height), outline=0, fill=0)
# Draw some shapes.
# First define some constants to allow easy resizing of shapes.
padding = -2
top = padding
bottom = height-padding
# Move left to right keeping track of the current x position for drawing shapes.
x = 0
# Load default font.
font = ImageFont.load_default()
# Alternatively load a TTF font. Make sure the .ttf font file is in the same directory as the python script!
# Some other nice fonts to try: http://www.dafont.com/bitmap.php
# font = ImageFont.truetype('Minecraftia.ttf', 8)
# var1 = '%'
my_string = '%'
while True:
f = open("SongInfo.txt","r")
# Draw a black filled box to clear the image.
draw.rectangle((0,0,width,height), outline=0, fill=0)
# Shell scripts for system monitoring from here : https://unix.stackexchange.com/questions/119126/command-to-display-memory-usage-disk-usage-and-cpu-load
cmd = "hostname -I | cut -d\' \' -f1"
IP = subprocess.check_output(cmd, shell = True )
cmd = "top -bn 2 -d 1 | grep '^%Cpu' | tail -n 1 | gawk '{print $2+$4+$6}'"
CPU = subprocess.check_output(cmd, shell = True )
cmd = "free -m | awk 'NR==2{printf \"Mem: %s/%sMB %.2f%%\", $3,$2,$3*100/$2 }'"
MemUsage = subprocess.check_output(cmd, shell = True )
# Write text.
draw.text((x, top), "IP: " + str(IP), font=font, fill=255)
draw.text((x, top+8), "CPU-Usage: " + str(CPU), font=font, fill=255)
draw.text((80, top+8), "% ", font=font, fill=255)
draw.text((x, top+16), str(MemUsage), font=font, fill=255)
draw.text((x, top+25), f.readline(), font=font, fill=255)
# Display image.
disp.image(image)
disp.display()
time.sleep(.1)
Display More
VG,
amDude
