serial data convertion

Hi, I have a problem, Im trying to read instructions from a python program over the serial port on the arduino but I need to read it as decimal not ascii, How can I convert the read instruction to read decimal instead of ascii on the arduino side?

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You can capture the string of numeric characters sent to the arduino as a character String, then convert that String into a number. Info link and example below.

// zoomkat 10-14-11 serial servo test
// use a microseconds value like 1500 in serial monitor
// for IDE 0022 and later
// Powering a servo from the arduino usually DOES NOT WORK.

String readString;
#include <Servo.h> 
Servo myservo;  // create servo object to control a servo 

void setup() {
  Serial.begin(9600);
  myservo.writeMicroseconds(1500); //set initial servo position if desired
  myservo.attach(7);  //the pin for the servo control 
  Serial.println("servo-test-22"); // so I can keep track of what is loaded
}

void loop() {
  while (Serial.available()) {
    char c = Serial.read();  //gets one byte from serial buffer
    readString += c; //makes the string readString
    delay(2);  // allow buffer to fill with next character
    }

  if (readString.length() >0) {
    Serial.println(readString);  //so you can see the captured string 
    myservo.writeMicroseconds(readString.toInt()); //convert readString to number for servo
    readString=""; //empty for next input
  } 
}