python 字符串检查的简单工具方法

def (s):
    if isinstance(s, str):
        return s.strip()
    else:
        return ''


# 判断字符不为空
def is_not_empty_str(s):
    if s is None:
        return False
    elif isinstance(s, str):
        return s.strip() != ""
    else:
        return False