import nuke
def showReads ():
    """
    This panel gives you the number of reads that are either selected or in the entire script.
    Additionally, it tells you the path of either selected nodes or all read nodes.
    """
    reads = []
    readfiles = []
    nodes = nuke.selectedNodes('Read')
    if len(nodes) < 1:
        nodes = nuke.allNodes('Read')
    
    for node in nodes:
        if nuke.filename(node) not in readfiles:
            reads.append ({'file':nuke.filename(node),'start':node['first'].value(),'end':node['last'].value()})
            readfiles.append (nuke.filename(node))
           
    
    read = ''
    output = ''
    x = 0
    for read in reads:
        x = x + 1
        output = '%s%s %d-%d\n' % (output, read['file'], int(read['start']), int(read['end']))
    
    p = nuke.Panel('Read Paths', setWidth=650)
    
    p.addSingleLineInput('Script Name:',  nuke.root()['name'].value())
    p.addMultilineTextInput ('Paths:',output)
    p.addSingleLineInput ('Total Selected:', x)

    p.setWidth(1000)
    p.show()