PySerial and microcontroller
putsU1("string");

// print a string

    int putsU1(char *s) {
     while(*s)
        putU1(*s++);
    }

// print a character

    int putU1(int c) {
      while (_UTXBF);
        U1TXREG = c;
      return c;
    }

In [13]: ser = serial.Serial('/dev/ttyACM0', 9600, bytesize=7, xonxoff=0)

In [14]: while True:
            print(struct.unpack('s', ser.read()))
         ....:
('x7f',)
('c',)
('x11',)
('t',)
('e',)
('y',)
('=',)
('x7f',)

getsnU1(s, BUF_SIZE);

     char *getsnU1(char *s, int len) {
        char *p = s;
        int cc = 0;
        do {
           *s = getU1();
           putU1(*s);

           if ((*s == 0x8) && (s > p)) {
              putU1(' ');
              putU1(0x8);
              len++;
              s--;
              continue;
           }

           if (*s == 'n')
              continue;

           if (*s == 'r')
              break;
           s++;
          len--;
       } while (len > 1);

      *s = '';

      return p;
    }

#define FOSC            8000000
#define FCY             (FOSC/2)
#define BAUD            9600
#define U1BRGValue      (((FCY/BAUD)/16)-1)

void initUART1(void) {
/* general UART config */
RPINR18bits.U1RXR = U1RXPIN;            // set RP5 as UART1 RX
_RP6R = 0b00011;                        // set RP6 as UART Tx pin
U1RXPINTRIS = 1;                        // set RP5 (RB5) as input
U1MODEbits.PDSEL = DATAPARITY;           // set data bits and parity
U1MODEbits.STSEL = STOPBITS;            // set stop bits
U1MODEbits.ABAUD = 0;                   // auto-baud disabled
U1MODEbits.BRGH = 0;                    // low speed baud rate
U1BRG = U1BRGValue;                     // set baud value


/* enable interrupt on error */
IEC4bits.U1EIE = 1;                     // enable UART1 error interrupt
IPC16bits.U1EIP = 6;                     // set interrupt priority to 6

/* enable RX buffer interrupt */
IEC0bits.U1RXIE = 0;                    // enable UART1 RX interrupt
U1STAbits.URXISEL = 0b00;                // interrupt flag is set when buffer is 3/4 full
IPC2bits.U1RXIP = 6;                     // set interrupt priority to 6

/* enable TX interrupt */
IEC0bits.U1TXIE = 0;


/* enable UART1 module */
U1MODEbits.UEN = 0b00;
U1MODEbits.UARTEN = 1;
_UTXEN = 1;                             // enable UART Tx

def write(s):
    for c in s:
        ser.write(c)
        time.sleep(0.001) # often not required