def is_chinese(s):
return all('\u4e00' <= char <= '\u9fff' for char in s)
# 示例使用
s1 = "汉字大萨"
s2 = "汉字."
s3 = "@#!汉字"
s4 = "asd字"
print(is_chinese(s1)) # True
print(is_chinese(s2)) # False
print(is_chinese(s3)) # False
print(is_chinese(s4)) # False