lines of code calculator

Python uses only 40 lines of code to write a calculator instance, and python40 lines This example describes a calculator written in Python with only 40 lines of code. We will share this

Python + tkinter use 80 lines of code to implement a calculator instance, tkinter80 lines This article describes how to use Python + tkinter to program a simple calculator code example. If you don't talk about it, go straight to

80 lines of code use Python + tkinter to implement a calculator, 80 lines of tkinter If you don't talk about it, go straight to the topic. We recommend that you repeat the code and try out the code reuse, use the string method, a

This article describes how to use only 50 lines of code to implement a calculator written in Python. it mainly uses the PlyPlus library to make the core code very simple. For more information, see Introduction In this article, I will show you how to parse and calculate a four arithmetic expression just like a general

Use 50 lines of Python code to create a calculatorIn this article, I will show you how to parse and calculate a four-digit arithmetic expression just like a common calculator. When we end, we will get a calculator that can process expressions such as 1 + 2 *-(-3 + 2)/5.6 + 3. Of course, you can also expand it more powe

basically ' lambda x,y:x+y '. OK, now let's run this code to check the results. >>> Calc (). Transform (G.parse (' 1 + 2 *-( -3+2)/5.6 + 30 ')) 31.357142857142858 What about eval ()? 7 >>>eval (' 1 + 2 *-( -3+2)/5.6 + 30 ') 31.357142857142858 Succeeded:)Last step: REPL For the sake of beauty, we wrap it up in a nice calculator REPL: Defmain (): calc=calc () whiletrue: try: s=raw_input (' > ')

Each method corresponds to a rule. If the method does not exist, the __default__ method is invoked. We omitted Start,add_symbol and Mul_symbol, because they would only return their own branches. I used float () to parse the numbers, which is a lazy way, but I can do it with a parser. To keep the statement clean, I used the operator module. For example, add is basically ' lambda x,y:x+y ' or something like that. OK, now let's run this code to

take a look at the concrete implementation. >>>importoperator as Op >>>fromplyplusimportstransformer Classcalc (Stransformer): Def_bin_operator (Self, exp): Arg1, Operator_symbol, Arg2=exp.tail operator_func={' + ': Op.add, '-': op.sub, ' * ': Op.mul, '/': Op.div}[operator_symbol] Returnoperator_func (Arg1, arg2) Number =lambdaself, Exp:float (Exp.tail[0]) Neg =lambdaself, exp:-exp.tail[0] __default__=lambdaself, Exp:exp.tail[0] Add=_bin_operator Mul=_bin_operator Each method corresponds

a look at the specific implementation. >>>importoperatorasop >>>fromplyplusimportSTransformer classCalc(STransformer): def_bin_operator(self,exp): arg1,operator_symbol,arg2=exp.tail operator_func={'+':op.add, '-':op.sub, '*':op.mul, '/':op.div}[operator_symbol] returnoperator_func(arg1,arg2) number=lambdaself,exp:float(exp.tail[0]) neg=lambdaself,exp:-exp.tail[0] __default__=lambdaself,exp:exp.tail[0] add=_bin_operator mul=_bin_

Calculator written with 40 lines of pythoncodeOccasionally writing something in a script is also good. Code From tkinter import * reset = Truedef buttonCallBack (event): global label global reset num = event. widget ['text'] if num = 'C': label ['text'] = "0" return if num in "= ": label ['text'] = str (eval (label ['text']) reset = True return s = label ['text']

Simple JS calculator implementation code and js calculator code Look at the calculators in your cell phone. They are divided into common calculators and scientific calculators. If you think your head is not big enough, you can implement a normal version (supporting basic continuous operations such as positive, negativ

In the process of working or learning code, we often want to know how many lines of code we have written, and today we write a script in the project environment to count the number of project code.Function:1. Total number of statistics code rows2. Counting Empty rows3. Count the number of comment

(Line.endswith ("*/")) {comment = false; }} else if (Line.startswith ("//")) {commentlines++; } else {normallines++; }}} catch (IOException e) {e.printstacktrace (); }} catch (FileNotFoundException e) {e.printstacktrace (); } finally {if (BR! = null) {try {System.out.println ("blank line number : "+whitelines); System.out. println ("Number of comment line