这里statement1和statement2两个变量都为字符串,但是quantity这个变量为整数,因此print statement1 + quantity + statement2会报错TypeError: cannot concatenate 'str' and 'int' objects, 提示不能将字符串和整数拼接合并。解决的办法是使用str()这个函数将quantity从整数转化为字符串,举例如下: ...
如果.是放在赋值语句后面,且值是非整数,就会报错 1#值是字符型2In [18]: x*y3Out[18]:245In [19]: a="bb".6File"<ipython-input-19-35d6cdca8521>", line17a="bb".8^9SyntaxError: invalid syntax1011#值是浮点型12In [20]: a =1.9.13File"<ipython-input-20-d03258cd8a31>", line114a =...
we have a technique calledMnemonic(记忆的).The idea is when you choose a variable name,you should choose a variable name to be sensible and Python doesnt care whether you choose mnemonic variable names or not. Assignment Statements: An assignment statement consists of an expression on the right...
In Python, theequal sign (=) assigns a variable to a value: >>>count=4>>>count4 This is called anassignment statement. We've pointed the variablecountto the value4. We don't have declarations or initializations Some programming languages have an idea ofdeclaring variables. ...
Variable：在程序中存储数据的标识符。Assignment：将值分配给变量的操作。Function：一段可重用的代码块，...
A common use of the conditional expression is to select variable assignment. For example, suppose you want to find the larger of two numbers. Of course, there is a built-in function, max(), that does just this (and more) that you could use. But suppose you want to write your own co...
a = 12 is correct, but 12 = a does not make sense to Python, which creates a syntax error. Check it in Python Shell. >>> a = 12 >>> 12 = a SyntaxError: can't assign to literal >>> Multiple Assignment The basic assignment statement works for a single variable and a single expr...
Python augmented assignment operators combines addition and assignment in one statement. Since Python supports mixed arithmetic, the two operands may be of different types. However, the type of left operand changes to the operand of on right, if it is wider....
4] l[3] = 40 # 和很多语言类似,python中索引同样从0开始,l[3]表示访问列表的第四个元素 l [1, 2, 3, 40] tup = (1, 2, 3, 4) tup[3] = 40 Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: 'tuple' object does not support item assignment ...
ModuleVariable 7 0 7 ParameterSpec 1 0 1 ParameterVariable 1 0 1 PythonFunctionCreatedContext 1 1 0 PythonMainModule 1 0 1 PythonModuleContext 1 1 0 StatementAssignmentVariableConstantImmutable 3 0 3 StatementAssignmentVariableConstantMutable 1 0 1 ...