python lambda, filtering out non alpha characters -

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i'm trying keep letters in string. trying this:

s = '1208uds9f8sdf978qh39h9i#h(&#*h(&h97dgh' s_ = lambda: letter if letter.isalpha(), s

this errors out. how working version look?

how about

re.sub('[^a-za-z]','', s)

or

"".join([x x in s if x.isalpha()])

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