#myString is None OR myString is empty or blank return True 1. 2. 3. 4. 5. 6. 并且,与测试字符串是否不是None或NOR空或NOR空白完全相反: AI检测代码解析 def isNotBlank (myString): if myString and myString.strip(): #myString is not None AND myString is not empty or blank return ...
方法一:使用if语句判断字符串是否为空 最常见的方法是使用if语句判断一个字符串是否为空。在Python中,空字符串是一个长度为0的字符串,可以通过判断字符串的长度是否为0来判断字符串是否为空。 下面是使用if语句判断字符串是否为空的示例代码: AI检测代码解析 defis_empty_string(string):iflen(string)==0:retur...
zero_integer =0zero_float =0.0ifzero_integerorzero_float:print("This won't be executed.")else:print("This will be executed.") 空字符串:空字符串''被视为假。 empty_string =''ifempty_string:print("This won't be executed.")else:print("This will be executed.") 空列表、空字典、空集合...
Strings can beconcatenatedto build longer strings using the plus sign and also they can bemultipliedby a number, which results in the continuous repetition of the string as many times as the number indicates. Also, if we want to find out thelengthof the string, we simply have to use thelen...
使用if not优化代码 在多个条件链中使用if not可以提高代码清晰度,避免过度嵌套的if语句。 def process_request(request): if not request.is_valid(): print("请求无效。") return # 处理有效请求的代码 # ... 通过在函数process_request的开头使用if not提前退出,可以使代码更加简洁和易于阅读。
if text: print("The string is not empty") else: print("The string is empty") ``` 在这个例子中,如果`text`是空字符串,那么条件`if text`的结果将是`False`,因此会执行`else`语句,输出"The string is empty"。 另外需要注意的是,虽然空字符串被认为是`True`,但它在布尔运算中的优先级是低于其他...
StringIO的源码位于Modules/_io/stringio.c。作为一个C级对象,我们首先来看StringIO的object struct定义: 接下来的代码来自https://github.com/python/cpython的main分支,本文写作时的版本号为Python 3.12.0 Alpha 4。下同 typedefstruct{ PyObject_HEAD ...
Let’s check our first character string my_string1:print(any(c.isalpha() for c in my_string1)) # Check if letters are contained in string # TrueAs you can see, the logical value True has been returned, i.e. our first example string contains alphabetical letters....
Compare with if,elif, else : if, elif , else 实现比较 比较运算符:==, !=, <, <=, >, >= and, or, not what is true? 各种类型数据 的 true false的规定 False: { Boolean: Fase, Null: None, Zero integer:0, Zero float: 0.0, empty string: '', empty list: [], empty tuple: (...
A string is printable if all of its characters are considered printable in repr() or if it is empty. """ pass def isspace(self, *args, **kwargs): # real signature unknown """ Return True if the string is a whitespace string, False otherwise. ...