Python 字符串检查
字符串检查
要检查字符串中是否存在某个短语或字符，我们可以使用 in 或 not in 关键字。
例子 1
检查以下文本中是否存在短语 "ain"：
txt = "The rain in Spain stays mainly in the plain" x = "ain" in txt print(x)
例子 2
检查以下文本中是否不存在短语 "ain"：
txt = "The rain in Spain stays mainly in the plain" x = "ain" not in txt print(x)