python清除字符串里非字母字符的方法

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)

希望本文所述对大家的Python程序设计有所帮助。