2.5 表达式和语句(Expressions and statements) 表达式(expression)是集值、变量和运算符的式子。单独值本身也可视为一个表达式,同理变量也是。例如: x是已赋值的变量。 语句(statement)是Python解释器可执行的代码块。如print和赋值语句。严格来说,表达式也是语句,但其区别在于表达式有值,而语句没有。 2.6 交互模式和...
在一些其他语言中,^用来表示幂运算,但是在Python中,它是一个位运算符,叫做XOR。本书中没有涉及到位运算,但是你可以去维基百科阅读相关资料http://wiki.python.org/moin/BitwiseOperators。 在Python 2 中,除法操作符结果有时候并不是你需要的: >>> minute = 59 >>> minute/600 minute的值是59,通常59除以60...
These variables hold one value. So now if we have these three statements. And the third one executes it says put 100 in X and that wipes out the old value 12.2 and it rewrites it with 100 and so we can change the variables. That's another reason that we call them variable. 这些变量...
Related Topics: basics python Recommended Video Course: Variables in Python Related Tutorials: Conditional Statements in Python Basic Data Types in Python: A Quick Exploration Operators and Expressions in Python Python while Loops: Repeating Tasks Conditionally Defining Your Own Python Function Remo...
Chapter 2 Variables, expressions and statements 1)数值values和数值类型types 2)变量variables 变量就是引用数值的一个名字name,编程语言最强大的特点就是操作变量的能力。 # 1 赋值表达式 assignment statement # 2 赋值图 state diagram 3)变量名variable names 和 保留字keywords ...
Regular assignment statements with the = operator don’t have a return value, as you already learned. Instead, the assignment operator creates or updates variables. Because of this, the operator can’t be part of an expression. Since Python 3.8, you have access to a new operator that allows...
When you type a statement on the command line, Python executes it. Statements don't produce any result... index:: expression Evaluating expressions計算式子An expression is a combination of values, variables, operators, and calls to functions. If you type an expression at the Python prompt, ...
You cannot step within a line of code to show how subexpressions get evaluated within that line; the best workaround is to manually split complex expressions into multiple lines and assign to temporary variables on each line (example).
Lesson 2 - Expressions, Data Types, & Variables The Python programming language has a wide range of syntactical constructions, standard library functions, and interactive development environment features. Fortunately, you can ignore most of that; you just need to learn enough to write some handy lit...
and that_is_another_thing):do_something() 多行结构的闭括号/方括号/括号可以与列表的最后一行的第一个非空格字符对齐,如下所示: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 my_list=[1,2,3,4,5,6,]result=some_function_that_takes_arguments('a','b','c','d','e','f',) ...