python lambda，过滤掉非字母字符 [英] python lambda, filtering out non alpha characters

问题描述

我正在尝试仅将字母保留在字符串中.我正在尝试做这样的事情:

i'm trying to keep only the letters in a string. i am trying to do something like this:

s = '1208uds9f8sdf978qh39h9i#H(&#*H(&H97dgh'
s_ = lambda: letter if letter.isalpha(), s

这个错误出来了.工作版本的外观如何?

this errors out. how would a working version look?

推荐答案

或者:

s_ = filter(lambda c: c.isalpha(), s)

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