Python教程(2.3)——运算符和类型转换 Python里有很多运算符(operator),这节就让我们来详细学一学。 注意:本文没有特别说明的地方,只考虑bool、int、float三种类型。例如“两边操作数类型相同时,得到的结果为操作数类型”这句话只需要考虑上述三种类型就可以了。 算术运算符 加运算符(plus,+) +运算符将两个数相加。例如
operator_plus = tk.Radiobutton(root, text="+", variable=var_operator, value="+") operator_minus = tk.Radiobutton(root, text="-", variable=var_operator, value="-") operator_multiply = tk.Radiobutton(root, text="*", variable=var_operator, value="*") operator_divide = tk.Radiobutton...
3 Python的IDE,包括PythonWin、Eclipse+PyDev插件、Komodo、EditPlus 版本 python2与python3是目前主要的两个版本。 如下两种情况下,建议使用python2: 1 你无法完全控制你即将部署的环境时; 2 你需要使用一些特定的第三方包或扩展时; python3是官方推荐的且是未来全力支持的版本,目前很多功能提升仅在python3版本上...
OperatorDescriptionTry it () Parentheses Try it » ** Exponentiation Try it » +x -x ~x Unary plus, unary minus, and bitwise NOT Try it » * / // % Multiplication, division, floor division, and modulus Try it » + - Addition and subtraction Try it » << >> Bitwise left ...
plusminus_operator_list = re.findall("[+-]", parenthesises_formula) plusminus_expression_list = re.split("[+-]", parenthesises_formula) if plusminus_expression_list[0] == "": #圆括号表达式列表中,如果第一个元素为空,则表明第一个元素为一个负数,则"-"号开头,将第一个"-"号合并到列表...
We concatenate two strings using the same operator: "Walter" + "White" == "WalterWhite" CopyWe also concatenate lists with the plus operator: ['Jack', 'Jim'] + ['John'] == ['Jack', 'Jim', 'John'] CopyThe plus sign’s multifunctionality as an operator reflects a common concept ...
Debug/traceback/breakpoint/step/inspect/pdb/pprint/print_exc/print_exc_plus/print_stack/trace/...
You should read this example as total is equal to the current value of total plus 5. This expression effectively increases the value of total, which is now 15.Note that this type of assignment only makes sense if the variable in question already has a value. If you try the assignment ...
del plus_minus_operator[index] return merge(plus_minus_operator, multiply_divide_list) return plus_minus_operator, multiply_divide_list def fushu_cl(formula): #字符串负数处理 plus_minus_operator = re.findall("[+-]", formula) # 拿出+和- ...
plusplusEnables increment operators in Python with a bytecode hackWhat's this?By default, Python supports neither pre-increments (like ++x) nor post-increments (like x++). However, the first ones are syntactically correct since Python parses them as two subsequent +x operations, where + is ...