Re: [Tutor] output sequentially
lina wrote: I have below file, I wish the output following: The first field 169 -170 sequential, and then the filed 2 from 1-29, ignore the rest 4 fields, 169CHOL O28 1612 6.966 6.060 6.429 Read the lines from the file, sort them with a proper key function, write the sorted lines to a new file: with open(source.txt) as instream: lines = sorted(instream, key=mykey) with open(dest.txt, w) as outstream: outstream.writelines(lines) Now for the mykey() function: what should it look like? You want to sort by the integer value of the first two columns, so you have to split the lines into fields and then remove the non-digits from the fields you are interested in. Here's an outline: def extract_int(field): only_digits = ... return int(only_digits) assert extract_int(169CHOL) == 169 assert extract_int(H28) == 28 def mykey(line): fields = ... # example: ['169CHOL', 'H29', '1611', '6.963', '6.155', '6.395'] return extract_int(fields[0]), extract_int(fields[1]) assert mykey(169CHOL H29 1611 6.963 6.155 6.395\n) == (169, 28) Can you fill in the blanks? ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] output sequentially
Hi, I have below file, I wish the output following: The first field 169 -170 sequential, and then the filed 2 from 1-29, ignore the rest 4 fields, thanks for any suggestions, 169CHOL H29 1611 6.963 6.155 6.395 169CHOL O28 1612 6.966 6.060 6.429 169CHOLC3 1613 7.005 6.073 6.566 169CHOLC4 1614 6.940 5.950 6.629 169CHOLC5 1615 7.006 5.934 6.766 169CHOL C10 1616 6.980 6.060 6.849 169CHOLC1 1617 7.040 6.182 6.781 169CHOLC2 1618 6.973 6.201 6.645 169CHOLC6 1619 7.055 5.819 6.816 169CHOLC7 1620 7.089 5.824 6.965 169CHOLC8 1621 7.000 5.916 7.048 169CHOLC9 1622 7.031 6.056 6.993 169CHOL C11 1623 7.000 6.169 7.092 169CHOL C12 1624 7.050 6.144 7.235 169CHOL C13 1625 6.993 6.009 7.281 169CHOL C14 1626 7.048 5.897 7.193 169CHOL C15 1627 6.982 5.781 7.266 169CHOL C16 1628 7.008 5.803 7.414 169CHOL C17 1629 7.038 5.952 7.414 169CHOL C19 1630 6.830 6.092 6.846 169CHOL C18 1631 6.841 6.000 7.265 169CHOL C20 1632 6.983 6.033 7.532 169CHOL C21 1633 7.094 6.057 7.635 169CHOL C22 1634 6.862 5.976 7.605 169CHOL C23 1635 6.838 6.050 7.737 169CHOL C24 1636 6.753 5.958 7.824 169CHOL C25 1637 6.609 6.008 7.837 169CHOL C26 1638 6.537 5.895 7.911 169CHOL C27 1639 6.620 6.116 7.945 170CHOL H29 1640 5.603 6.375 6.159 170CHOL O28 1641 5.625 6.472 6.165 170CHOLC3 1642 5.604 6.501 6.303 170CHOLC4 1643 5.560 6.645 6.330 170CHOLC5 1644 5.539 6.683 6.477 170CHOL C10 1645 5.670 6.664 6.552 170CHOLC1 1646 5.716 6.520 6.531 170CHOLC2 1647 5.732 6.480 6.384 170CHOLC6 1648 5.427 6.733 6.530 170CHOLC7 1649 5.430 6.768 6.679 170CHOLC8 1650 5.569 6.795 6.736 170CHOLC9 1651 5.661 6.676 6.704 170CHOL C11 1652 5.792 6.713 6.775 170CHOL C12 1653 5.781 6.703 6.927 170CHOL C13 1654 5.695 6.824 6.964 170CHOL C14 1655 5.564 6.799 6.889 170CHOL C15 1656 5.462 6.893 6.952 170CHOL C16 1657 5.506 6.897 7.097 170CHOL C17 1658 5.637 6.821 7.105 170CHOL C19 1659 5.765 6.766 6.489 170CHOL C18 1660 5.769 6.948 6.913 170CHOL C20 1661 5.727 6.885 7.211 170CHOL C21 1662 5.832 6.780 7.247 170CHOL C22 1663 5.655 6.910 7.343 170CHOL C23 1664 5.749 6.980 7.441 170CHOL C24 1665 5.667 6.987 7.570 170CHOL C25 1666 5.745 7.071 7.672 170CHOL C26 1667 5.674 7.205 7.695 170CHOL C27 1668 5.760 6.998 7.805 -- Best Regards, lina ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
