for if else in one line

>>> plate = '3k4j3m'

>>> nmplt=[]

>>> letplt=[]

>>> [letplt.append(let) if(i%2!=0) else nmplt.append(let) for i,let in enumerate(plate)]

[None, None, None, None, None, None]

>>> nmplt

['3', '4', '3']

>>> letplt

['k', 'j', 'm']

>>> ''.join(nmplt)

'343'

>>> ''.join(letplt)

'kjm'

Using only if

>>> [let for i,let in enumerate(plate) if i%2!=0]

['k', 'j', 'm']