python清除字符串里的非字母字符
s = "hello world! how are you? 0"
# Short version
print filter(lambda c: c.isalpha(), s)
# Faster version for long ASCII strings:
id_tab = "".join(map(chr, xrange(256)))
tostrip = "".join(c for c in id_tab if c.isalpha())
print s.translate(id_tab, tostrip)
# Using regular expressions
print re.sub("[^A-Za-z]", "", s)
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