1>>> type(True)#返回<class 'bool'>2<class'bool'>3>>> type(False)#返回<class 'bool'>4<class'bool'>5>>> isinstance(False, int)#bool 类型属于整形,所以返回True6True7>>> True == 1, Trueis1#输出(True, False)8(True, False)9>>>
>>> type(b[0]) <class 'tuple'> >>> d.keys() dict_keys([1, 2, 3]) >>> c=list(d.keys()) >>> c [1, 2, 3] >>> for i in c: print(i) 1 2 3 >>> d.values() dict_values(['a', 'b', 'c']) >>> for key,value in d.items() SyntaxError: invalid syntax >>...
datatype并不是Python标准库，且也不可以用于检查数据类型，代码会运行出错，如果你想检查数据类型，建议使用type（）函数。“代码运行出错，错误提示类似"发生异常: NameError name 'datatype' is not defined File "I:\PYTHON\1\py002.py", line 4, in <module> print(datatype(x)) ”等 1.Python3....
'''代码源于书中例子,直接上码'''importsysfromfractionsimportFractionfromdecimalimportDecimalasD# rename for brevityfromoperatorimportitemgetterfromcollectionsimportnamedtuplefromcollectionsimportdefaultdictfromcollectionsimportChainMap'''Integers使用'''a=12b=3print(a+b)# 相加 15print(b-a)# 相减 -9print(a/...
data = [1, "apple", True, {"name": "Bob"}]for item in data: if datatype(item) == 'int': print(f"整数值：{item}") elif datatype(item) == 'str': print(f"字符串：{item}") elif datatype(item) == 'bool': print(f"布尔值：{item}") elif datatype(...
python中datatype的用法 python中datatype函数 一、标示符和关键字Identifiers and Keywords Python 有一个内置函数dir(),它用于返回一个对象的属性列表,该函数没有参数时返回Python的内置属性列表 >>> dir() ['__builtins__', '__doc__', '__name__']...
in Python is an object and every object has an identity, a type, and a value. Like another object-oriented language such as Java or C++, there are several data types which are built into Python. Extension modules which are written in C, Java, or other languages can define additional ...
In Python, the data type is set when you assign a value to a variable: ExampleData TypeTry it x = "Hello World"strTry it » x = 20intTry it » x = 20.5floatTry it » x = 1jcomplexTry it » x = ["apple", "banana", "cherry"]listTry it » ...
File"<pyshell#62>", line 1,in<module>ls NameError: name'ls'isnotdefined>>> 二、tuple and sequence 字符串,列表,都是序列数据类型,元组也是,都可以进行切片,索引 元组是不可变的对象 当定义一个元组,只有一个元素,要使用逗号commas,定义空元组时要用() ...
In Python, a string is a sequence of characters enclosed within either single quotes (‘‘) or double quotes (" "). It is an immutable data type, which means once a string is created, it cannot be modified. However, it is possible to create a new string by concatenating two or more...