Extracting a changeable string from a list and insertion in Python -

i'm still learning python, bare me!

i have list looks this:

['2    19   2839475239874 hda'] 

i need extract hda end. however, hda may not last chunk, hda may not 3 letters (it 4 or 5, , include numbers); start letter 'h'.

after hda extracted, need insert chunk dd command. looks this:

dd if=/dev/zero of=/dev/hda bs=512 count=1 

but if hda different each time run dd command, need way have 'hda' part of dd command changeable.

sorry if confusing, beginner , confused myself! i've tried using startswith extraction, can't past there!

simply so:

lst = ['2    19   2839475239874 hda']  # extracting device part dev = filter(lambda s: s[0] 'h', lst[0].split())[0]  # inserting cmd = 'dd if=/dev/zero of=/dev/{0} bs=512 count=1'.format(dev) 

you want check case don't have h-word in list though.