How to insert letter "A" on each line (of a very long list of lines) at position 22, i.e., one space after "LEU", leaving all other characters at the same position as in the original example:
ATOM 1 N LEU 1 146.615 40.494 103.776 1.00 73.04 1SG 2 In all lines"ATOM" is constant as to both position and string, while "LEU" is constant as to position only, i.e., "LEU" may be replaced by three different uppercase letters. Therefore, the most direct indication would be position 22. Should the script introduce blank lines, no problem. That I know how to correct with a subsequent script. Thanks chiendarret -- http://mail.python.org/mailman/listinfo/python-list
