Go for Python Programmers Alexandre Vicenzi Pythonista at Red Hat 

History ● Robert Griesemer, Rob Pike and Ken Thompson ● Google ● Began in late 2007 ● First public release in 2009 ● First stable release in 2012 

Why a new language? ● Frustration with existing languages ● Programming had become too difficult ● Many years with a quiet landscape of choices ● To take advantage of networking and multicore 

Features ● Compiles to native machine code ● Memory safety ● Garbage collection ● Concurrency 

Go vs Python 

Code organization ● Keep everything in a single workspace ○ src - source files ○ bin - executable commands ● GOPATH environment variable ($HOME/go) ● Workspace contains multiple repositories ● Import path is the package location in the workspace 

Package management ● No official tool yet ● Tools ○ dep - The official experiment ○ Godep ○ Govendor ○ Glide ○ many others ● Modules ○ Preliminary support ○ No need for GOPATH anymore ○ Go 1.13 (August 2019) 

Object Oriented Programming ● No classes ● No inheritance ● No generics ● Interfaces ● Composition ● Type embedding 

Pointers ● Everything in Go is passed by value ● No pointer arithmetic ● Pointer is represented by * ● * is also used to “dereference” ● & returns the memory address ● new function 

Go concurrency ● Goroutines ○ Function executing concurrently with other functions in the same address space ○ Goroutines are multiplexed onto multiple OS threads ● Channels ○ Typed, synchronized, thread-safe by design ○ Buffered and Unbuffered (default) 

What else is different? ● No decorators ● No named or optional arguments ● No iterators ● No generators ● No exceptions ● Part of the C family ● Labels and goto 

Your first program package main import "fmt" func main() { fmt.Println("Hello, world.") } 

factorial.py def factorial(n): if n == 0: return 1 return n * factorial(n - 1) print(factorial(5)) 

factorial.go package main import "fmt" func factorial(n int) int { if n == 0 { return 1 } return n * factorial(n-1) } func main() { fmt.Println(factorial(5)) } 

fibonacci.py def fibonacci(n): a, b = 0, 1 yield a for i in range(n): a, b = b, a + b yield a for i in fibonacci(10): print(i) 

fibonacci.go package main import "fmt" func fibonacci(c chan int, n int) { a, b := 0, 1 c <- a for i := 0; i < n; i++ { a, b = b, a+b c <- a } close(c) } func main() { c := make(chan int) go fibonacci(c, 10) for i := range c { fmt.Println(i) } } 

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Conclusion Go is ● Simple ● Concurrent ● Robust ● Fun 

Next steps ● golang.org ● tour.golang.org ● groups.google.com/d/forum/golang-nuts ● golang-book.com 

Thank you Alexandre Vicenzi Pythonista at Red Hat alexandrevicenzi.com @alxvicenzi