usr bin python2 from os import system from sys import exit from comman

#!/usr/bin/python2.5
from os import system
from sys import exit
from commands import getoutput

MAXIMA_COMMAND = u'/usr/bin/maxima --batch-string="string(%s);" --very-quiet'
INFILE = u'task.in'
OUTFILE = u'task.out'

if "__main__" == __name__:
    try:
        fin = open(INFILE, "r")
        fout = open(OUTFILE, "w")
    except IOError, e:
        sys.exit(u'error: %s' % e)
    task = []
    for line in fin:
        task.append(line.strip())
        if 0 == len(task) % 2:
            answer = getoutput(MAXIMA_COMMAND % (task[0])).split("\n")[1].strip()    
            value = getoutput(MAXIMA_COMMAND % (answer.replace(u'x', str(float(task[1]))))).split("\n")[1].strip()
            print (MAXIMA_COMMAND % (answer.replace(u'x', str(float(task[1])))))
            fout.write(u'%s\n%s\n' % (answer, value))
            fout.write(u'%s\n%s\n' % (answer, value))
            task = []
    fin.close()
    fout.close()


task.in:
diff(cos(x), x)
1
diff(sin(x)*cos(x), x)
3