#open for linecounts
f = open('file.ext')
line_count = sum(1 for _ in f)
f.close()

#re-open for process
f = open('file.ext')
i = 0
#loop if 'i' is not equal to line_count
while i != line_count:
    line = f.readline().replace('\n', '')
    lineSplit = line.split(':')
    userName = lineSplit[0]
    passWord = lineSplit[4].strip('\r').strip('\n')
    print("[+] Trying: "+userName+"/"+passWord)
    i += 1
f.close()