import re
str = "The rain in Spain"
# 返回所有单词字符的匹配项(a 到 Z 的字母,0-9 的数字,以及下划线 _ 字符):
x = re.findall("\w", str)
print(x)
if (x):
print("Yes, there is at least one match!")
else:
print("No match")