在Python中,可以使用isinstance()函数来判断一个变量的类型是否为字符串。例如: value = "hello" if isinstance(value, str): print("value is a string") else: print("value is not a string") 复制代码 另外,也可以直接使用type()函数来判断一个变量的类型是否为字符串。例如: value = "hello" if typ...
Python中内置的type()函数可以返回一个变量的类型。可以用type()函数和运算符isinstance()进行类型判断。例如: x=10y="hello"z=[1,2,3]ifisinstance(x,int):print("x is an integer")ifisinstance(y,str):print("y is a string")ifisinstance(z,list):print("z is a list")else:print("zis not a...
copy.PyStringMap copy.deepcopy copy.error copy.t In [3]: help(copy.copy) copy(x) Shallow copy operation on arbitrary Python objects. deepcopy(x, memo=None,_nil=[]) Deep copy operation on arbitrary Python objects. In [5]: a=[1,2,3] In [6]: b=a In [7]: id(a) Out[7]:...
type(3.14159), type("123")6#类型转换7printint(3.14159), int(-2.8)8printfloat(3), float(-1)9#输出字符串10print"span"+"and"+"eggs"11str1 ="teacher"12str2 ="student"13print"I'm a %s, not a %s"%(str1, str2)14s ="123"15printtype(s) ==str16#次方17print3 ** 318print81 ...
Check if type of a variable is string in Python - In this article, we are going to find out how to check if the type of a variable is a string in Python. The first approach is by using the isinstance() method. This method takes 2 parameters, the first pa
is 比较的是id是否相同,== 比较的是值是否相同 #如果is判断的结果为True,那么二者的id一样,即二者内存地址一样,即二者就是一个东西,即值一定相等#如果==判断的结果为True,那么二者的值一样,但是二者的内存地址可能不一样 如果要判断一个变量的是否等于None、True、False,建议使用is去判断 ...
Python Data Types with Examples Python Arrays - The Complete Guide What is String in Python and How to Implement Them? Python Numbers - Learn How to Create Prime Numbers, Perfect Numbers, and Reverse Numbers in Python Python Classes and Objects: A Beginner’s Guide to OOP Python for Loops ...
python编程之if/for/whil 1、python流程控制之if测试 A、python对象的特点--所有对象都支持比较操作 数字:通过相对大小进行比较 字符串:按照字典次序逐字进行比较 列表和元组:自左至右比较各部分内容 字典:对排序之后的(键、值)列表进行比较 B、python中真和假的含义...
1. Quick Examples of Checking if String is Empty If you are in a hurry, below are some quick examples of how to check whether the given string is empty or not in Python. # Quick Examples # Using not to check if string is empty ...
1 class str(basestring): 2 """ 3 str(object='') -> string 4 5 Return a nice string representation of the object. 6 If the argument is a string, the return value is the same object. 7 """ 8 def capitalize(self): 9 """ 首字母变大写 """ 10 """ 11 S.capitalize() -> str...