Python - pdsend datastream

First of all some context: Four MPR121 Breakout Boards (http://ift.tt/1nKbVNI) connected via i2C to a Raspberry Pi 2. A python script reads the data from the four boards and sends it to pure data with pdsend.

At the moment I have managed to get all the data I need to print nicely on the terminal. However, I am not sure how to get the same in pure data as I am getting text messages only (something like "print: .join(map(str print: diff3))")

I am pretty sure I need to change the os.system line to accomodate for the variables but I can't find how to do this.

Thank you very much in advance.

def send2Pd (message=' '):
os.system("echo '" + message + "' | pdsend 3000");

while True:

diff1 = [cap1.baseline_data(i)-cap1.filtered_data(i) for i in range(12)]
print 'Diff1:', '\t'.join(map(str, diff1))
send2Pd ('.join(map(str, diff1));')

diff2 = [cap2.baseline_data(i)-cap2.filtered_data(i) for i in range(12)]
print 'Diff2:', '\t'.join(map(str, diff2))
send2Pd ('.join(map(str, diff2));')

diff3 = [cap3.baseline_data(i)-cap3.filtered_data(i) for i in range(12)]
send2Pd ('.join(map(str, diff3));')
print 'Diff3:', '\t'.join(map(str, diff3))

diff4 = [cap4.baseline_data(i)-cap4.filtered_data(i) for i in range(12)]
print 'Diff4:', '\t'.join(map(str, diff4))
send2Pd ('.join(map(str, diff4));')

time.sleep(0.1)