import os

path = './testTTCN'
files = os.listdir(path)

i = 1
for file in files:
    ttcnfile = path +'/'+file
    # -gui or -tree or -token
    runcmd = 'grun TTCN ttcn3module -gui ' +ttcnfile
    print(runcmd)
    os.system(runcmd)
    if( i%5 ==0):
        os.system("pause")