步骤1:检查变量的类型 在实现isEmpty函数之前,我们首先需要检查传入的变量的类型。根据变量的类型,我们可以确定使用哪种方法来判断其是否为空。以下是检查变量类型的代码示例: defisEmpty(var):# 检查变量的类型ifisinstance(var,str):# 字符串类型的处理passelifisinstance(var,list):# 列表类型的处理passelifisinsta...
src_str[test111test222] 不含有 match_str[sky] use"find" to match,返回首次匹配的下标,匹配不到 返回 -1src_str[test111test222],match_str[sky],匹配到的下标为[-1] use"rfind" to match,返回最后一次匹配到的下标,匹配不到返回-1src_str[test111test222],match_str[sky],匹配到的下标为[-1] ...
ifis_empty:print("字符串为空")else:print("字符串不为空") 1. 2. 3. 4. 示例代码 下面的代码是将上述步骤整合在一起的完整示例代码: str_input=input("请输入一个字符串: ")# 方法1:使用len函数iflen(str_input)==0:is_empty=Trueelse:is_empty=False# 方法2:使用not运算符is_empty=notbool(...
if test_str.strip(): Remove empty spaces and check for empty. if bool(name): False when a string has a value.True when a string is empty. if test_str == "": True when a string is empty.False when a string has a value. if "".__eq__(test_str): True when a string is emp...
| 整数或浮点→字符串 |str( )|float_variable=float(2.15)``string_variable=str(float_variable)``print(string_variable)| | 字符串→列表 |列表()|greeting="Hello"``a_list=list(greeting)``print(a_list)| | 字符串→集合 |set( )|fruit="Banana"``a_set=set(fruit)``print(a_set)| ...
= None _protocol: str = None _user_agent: str = None _credential: CredentialClient = None def __init__( self, config: Config, ): if UtilClient.is_unset(config): raise TeaException({ 'name': 'ParameterMissing', 'message': "'config' can not be unset" }) if UtilClient.empty(...
Bing到这个网页,在StackOverflow上有人有同样的问题。https://stackoverflow.com/questions/20826788/str-split-giving-me-valueerror-empty-separator-for-a-sentence-in-the-for 可惜我的网络一直打不开网页,只能通过Bing的Cache来访问,555……http://cncc.bingj.com/cache.aspx?q=ValueError%3a+empty+separator&...
['Column2'] == 'Value')] # 字符串模糊匹配 filtered_df = df[df['Column_Name'].str.contains('pattern')] # 空值过滤 filtered_df = df[df['Column_Name'].isnull()] # 排除重复行 deduplicated_df = df.drop_duplicates() # 根据某一列的值进行分组 grouped_df = df.groupby('Column_Name...
Some built-in sequence types are list, str, tuple, and bytes. Note that dict also supports getitem() and len(), but is considered a mapping rather than a sequence because the lookups use arbitrary immutable keys rather than integers. 迭代器(Iterator):...
To check if a string is empty or whitespace using the len() function in Python, we will use the following steps.First, we will find the length of the input string using the len() function. We will store the length in a variable str_len. Now, we will check if the length of the...