LEARN GOLANG QUICKLY AND PYTHON CODING PRACTICE EXERCISES Coding For Beginners (TAM, JJ) (Z-Library)

LEARN GOLANG QUICKLY AND PYTHON CODING PRACTICE EXERCISES     CODING FOR BEGINNERS WITH HANDS ON PROJECTS BY J J TAM

Introduction Go Language Go: Hello World Application Go language: Build executable Go: Primitive Data Types Go language: Print value and type of a variable Go language: Initialize multiple variables in one line Go Language: Constants Go language: iota identifier Go Language: Type Conversion Go language: Type Inference Go language: strings Go language: concatenate strings Go language: multi line strings Go Language: Arrays Go Language: Arrays are passed by value Go language: Slices Go language: Slices are passed by reference Go language: Iterate over a slice using range keyword Go language: Get slice from a slice Go language: Append an element to a slice Go Language: Map data structure Go language: Define map using literal notation Go language: len : Get number of items in a map Go Language: Map: Check whether an item exists in map or not

Go language: Delete item from the map Go language: Print all the keys of map Go language: Print key, value from map Go language: if statement Go language: if-else statement Go language: if statement: combine initialisation and condition evaluation in same line Go Language: switch statement Go language: switch without an expression Go Language: for loop Go Language: Use for loop as while loop Go language: Print elements of array Go language: Iterate over a map Go language: Read data from console or user Go Language: Create a function Go Language: Pass by Reference Go language: Variadic Functions Go language: Return a value from function Go language: Anonymous functions Go Language: Functions continued Go Language: return Error from a function Go Language: Structs Go Language: Construct an object to a structure using & Go language : struct literal notation Go language: constructor functions

Go Language: Adding Methods to a struct PYTHON String – Exercises Python: Reverse a string Remove a newline in Python Find the common values Python Data Type: List – Exercises Python: Sum all the items in a list Get the largest number from a list Remove duplicates from a list Python Data Types: Dictionary – Exercises Add a key to a dictionary Iterate over dictionaries using for loops Merge two Python dictionaries Multiply all the items in a dictionary Remove a key from a dictionary Get a dictionary from an object's fields Combine two dictionary adding values for common keys Find the highest 3 values PYTHON BASICS – EXERCISES Display current date and time Print the calendar Computes the value of n+nn+nnn Calculate number of days volume of a sphere in Python

Compute the area of Triangle Compute the GCD CALCULATE THE LCM Convert feet and inches to centimeters Convert time – seconds Convert seconds to day Program to solve Future value of amount Check whether a file exists Convert the distance Sum all the items Multiplies all the items Get the largest number Get the smallest number Remove duplicates Clone or copy a list Difference between the two lists Generate all permutations Find the second smallest Get unique values Get the frequency of the elements Generate all sublists Find common items Create a list

LEARN GOLANG QUICKLY     CODING FOR BEGINNERS WITH HANDS ON PROJECTS BY J J TAM

Introduction Go Language   Go is an open source language to build reliable software in efficient way.   a .      Go is a compiled language. b .      Go has clean and clear syntax c .       Go has in built language support for concurrency d .      Go is statically typed language e .      Functions are first class citizens in Go f .        Go initialize default values for uninitialized variables. For example, for the string default value is empty string. g .      Go has good features that makes the development fast h .      Go has only few keywords to remember i .        Most of the computers now a days has multiple cores, but not all languages have efficient ways to utilize these multi cores. But Go has very good support to utilize multi core system in efficient way. .        Since Go has very good built-in support for concurrency features, you no need to depend on any threading libraries to develop concurrent applications. k .       Go has in-built garbage collector, so you no need to take the overhead of managing application memory. j. In Go, complex types are composed of smaller types. Go encourages composition.

Install and setup Go   Download latest version of Go from below location. https://golang.org/   Extract the downloaded zip file, you can see below content structure. $ ls AUTHORS  CONTRIBUTORS PATENTS  VERSION  bin  favicon.ico misc  robots.txt test CONTRIBUTING.md LICENSE  README.md api  doc  lib  pkg  src   Add bin directory path to your system path.     Open terminal or command prompt and execute the command ‘go’, you can see below output in console. $ go Go is a tool for managing Go source code.   Usage:   go <command> [arguments]   The commands are:   bug         start a bug report build       compile packages and dependencies clean       remove object files and cached files doc         show documentation for package or symbol

env         print Go environment information fix         update packages to use new APIs fmt         gofmt (reformat) package sources generate    generate Go files by processing source get         download and install packages and dependencies install     compile and install packages and dependencies list        list packages or modules mod         module maintenance run         compile and run Go program test        test packages tool        run specified go tool version     print Go version vet         report likely mistakes in packages   Use "go help <command>" for more information about a command.   Additional help topics:   buildmode   build modes c           calling between Go and C cache       build and test caching environment environment variables filetype    file types go.mod      the go.mod file gopath      GOPATH environment variable gopath-get  legacy GOPATH go get goproxy     module proxy protocol importpath  import path syntax modules     modules, module versions, and more module-get  module-aware go get packages    package lists and patterns testflag    testing flags testfunc    testing functions   Use "go help <topic>" for more information about that topic.  

Note If you do not want to install Go in your system, you can play around Go at ‘https://play.golang.org/’.

Go: Hello World Application   Open any text editor and create HelloWorld.go file with below content.   HelloWorld.go package main   func main() {   println ( "Hello, World" ) }   Execute the command ‘go run HelloWorld.go’. $ go run HelloWorld.go Hello, World   package main It is used by the Go compiler to determine application entry point.   func main() Program execution starts from here. ‘func’ keyword is used to define a function. ‘main’ function do not take any arguments.   println("Hello, World") ‘println’ is a built in function in Go, that is used to print given message to console.   Note a .      Unlike C, C++ and Java, you no need to end a statement by a semi colon. b .      String in Go, are placed in between double quotes

c .       Strings in Go are Unicode.

Go language: Build executable   Use the command ‘go build goFilePath’, to build the executable from go program.   App.go package main   import "fmt"   func main() { fmt.Println( "Hello World" ) }   $ go build App.go $ $ ls App     App.go   As you see 'App' file is created after building. If you run build command in windows, it generates App.exe file.     Run the file 'App' to see the output. $ ./App Hello World

Go: Primitive Data Types   Below table summarizes the data types provided by Go Language.   Integer Data Types Data Type Description Minimum Value Maximum Value uint8   Unsigned 8- bit integers 0 255 uint16   Unsigned 16-bit integers 0 65535 uint32     Unsigned 32-bit integers 0 4294967295 uint64     Unsigned 64-bit integers 0 18446744073709551615 int8   Signed 8-bit integers -128 127 int16   Signed 16- bit integers -32768 32767 int32 Signed 32- bit integers -2147483648 2147483647 int64 Signed 64- bit integers -9223372036854775808 9223372036854775807   Below table summarizes floating point numbers.   Data Type Description float32 IEEE-754 32-bit floating-point numbers float64 IEEE-754 64-bit floating-point numbers

  Below table summarizes the complex numbers.   Data Type Description complex64 Complex numbers with float32 real and imaginary parts complex128 Complex numbers with float64 real and imaginary parts   Apart from the above types, Go language support below types that are implementation specific.   a .      Byte b .      rune (same as int32) c .       uint d .      int e .      uintptr   Syntax to create variable var variableName dataType var variableName dataType  = value variableName := value   HelloWorld.go package main   import "fmt"   func main() {   var a int = 10   var b uint8 = 11   var c uint16 = 12   var d uint32 = 13   var e uint64 = 14   var f int8 = 15   var g int16 = 16

  var h int32 = 17   var i int64 = 18     var k float32 = 2   var l float64 = 2   complex1 := complex ( 10 , 13 )   fmt.Println( "a : " , a); fmt.Println( "b : " , b); fmt.Println( "c : " , c); fmt.Println( "d : " , d); fmt.Println( "e : " , e); fmt.Println( "f : " , f); fmt.Println( "g : " , g); fmt.Println( "h : " , h); fmt.Println( "i : " , i);   fmt.Println( "k : " , k); fmt.Println( "l : " , l);   fmt.Println( "complex1 : " , complex1);   }   Output a :  10 b :  11 c :  12 d :  13 e :  14 f :  15 g :  16 h :  17 i :  18 k :  2 l :  2 complex1 :  (10+13i)   How to access real and imaginary numbers from complex numbers?

You can use ‘real’ and ‘img’ methods to access the real and complex parts of a number.   myComplex := complex(10, 13) real(myComplex) imag(myComplex)     HelloWorld.go package main   import "fmt"   func main() {   complex1 := complex ( 10 , 13 )   var realPart = real (complex1)   var imgPart = imag (complex1)   fmt.Println( "complex1 : " , complex1); fmt.Println( "realPart : " , realPart); fmt.Println( "imgPart : " , imgPart);   }   Output   complex1 :  (10+13i) realPart :  10 imgPart :  13

Go language: Print value and type of a variable   %v is used to print the value of a variable %T is used to print the type of a variable.   App.go package main   import "fmt"   func main() {   var x int = 10   fmt.Printf( "i : %v, type : %T\n" , x, x) }   Output i : 10, type : int     Go language: Initialize multiple variables in one line   If variables are of same data type, you can initialize them in one line like below.   var i, j, k int = 1, 2, 3

   App.go package main   import (   "fmt" )   func main() {   var i, j, k int = 1 , 2 , 3   fmt.Println( "i : " , i, ", j : " , j, ", k : " , k)   }   Output i :  1 , j :  2 , k :  3