How I can multiply the fourth one from each row in the text file

[canatilaa]

- 2, 1, 2, 3, **4**, 15, 14, 29, 64168.0, 1

2, 1, 2, 3, **6**, 15, 14, 29, 64168.0, 1

2, 1, 2, 3, **8**, 15, 14, 29, 64168.0, 1

I wanna multiply this item

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

elif menu == 4:     fin = open("data.txt", "r")     i = 0     n = 0     freeday = fin.read[i][9]     i = i + 1       print freeday # 45 saatten fazla calısma yasası.......(n) elif menu == 5:     fin = open("data.txt", "r")     for line in fin:         totalweekdayshour = [5]         totalweekendhour = [6]     if totalweekdayshour + totalweekendhour >= 45:           print ("workers must be work 45 h")       else:         print ("no problem")     fin.close`

[Philia]

Properly format and indent your code. It's much more readable. Not to mention python code will not work without proper indentation.
I formatted and indented your code below. But It's not clear what you are trying to do here.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

elif menu == 4:         fin = open("data.txt", "r")         i = 0         n = 0         freeday = fin.read[i][9]         i = i + 1           print freeday # 45 saatten fazla calısma yasası.......(n)     elif menu == 5:         fin = open("data.txt", "r")         for line in fin:             totalweekdayshour = [5]             totalweekendhour = [6]             if totalweekdayshour + totalweekendhour >= 45:                  print ("workers must be work 45 h")       else:         print ("no problem") fin.close()

[Larz60+]

As philia states, it's unclear as to what your intention is, however to access the various elements of your file,
split each line into a list, then it will be easy to work with. Example:

1 2 3 4 5 6 7 8 9 10 11 12 13 14

import os   # make sure we are in same directory as script: os.chdir(os.path.abspath(os.path.dirname(__file__)))     with open('fin.txt', 'r') as fp:     linecount = 1     for line in fp:         line = line.strip().split(',')         print()         for n, item in enumerate(line):             print('item {} of line {} is equal to {}'.format(n, linecount, item))         linecount += 1

will generate:

Output:
item 0 of line 1 is equal to - 2
item 1 of line 1 is equal to  1
item 2 of line 1 is equal to  2
item 3 of line 1 is equal to  3
item 4 of line 1 is equal to  **4**
item 5 of line 1 is equal to  15
item 6 of line 1 is equal to  14
item 7 of line 1 is equal to  29
item 8 of line 1 is equal to  64168.0
item 9 of line 1 is equal to  1

item 0 of line 2 is equal to 2
item 1 of line 2 is equal to  1
item 2 of line 2 is equal to  2
item 3 of line 2 is equal to  3
item 4 of line 2 is equal to  **6**
item 5 of line 2 is equal to  15
item 6 of line 2 is equal to  14
item 7 of line 2 is equal to  29
item 8 of line 2 is equal to  64168.0
item 9 of line 2 is equal to  1

item 0 of line 3 is equal to 2
item 1 of line 3 is equal to  1
item 2 of line 3 is equal to  2
item 3 of line 3 is equal to  3
item 4 of line 3 is equal to  **8**
item 5 of line 3 is equal to  15
item 6 of line 3 is equal to  14
item 7 of line 3 is equal to  29
item 8 of line 3 is equal to  64168.0
item 9 of line 3 is equal to  1