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  • how to edit header in a fast file with python

    I am looking to edit the header of a fast file using python. I am converting the DNA sequence to an amino acid sequence and I need to add "-aa" where the first space in the header is located.

    The header looks like this:
    >ANIS1000.x1 ET TIME...

    It needs to look like this:
    >ANIS1000.x1-aa ET TIME...

    I can locate the index of the space using this:
    locate = dnaHeader.find(' ')

    But then I cannot insert the '-aa' using the insert function:
    dnaHeader = dnaHeader.insert(locate, ' ')

    The error says 'str' object does not support item assignment.

    Thanks!
    Brian

  • #2
    You could use:

    Code:
    newHeader= dnaHeader[0:locate] + '-aa' + dnaHeader[locate:]
    Maybe it's not the most efficient strategy since you need to create a new string but unless your file is massive it should be good enough.

    .insert() is a method for lists not for strings, which are immutable.

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