Python to Go Cheatsheet

34 points by tebeka 8 years ago | 7 comments

posedge 8 years ago |

My god is go a cumbersome language. I get why the explicitly returned errors are a good thing but the complexity for parsing json surprises me

nytopop 8 years ago | |

That's an artifact of it being statically typed. The data type to unmarshal into / marshal from needs to be defined somewhere. The extra stuff apart from error handling isn't required if you use a more generic type like `map[string]interface{}`.

ben_jones 8 years ago | |

What?

// example for unmarshalling an http request to JSON

contents, err := ioutil.Readall(req.Body)

if err != nil { return err }

req.Body.Close()

user := new(User)

if err := json.Unmarshal(contents, user); err != nil { return nil }

// do whatever you want with 'user'

Majora320 8 years ago | | |

Why do you have to call `req.Body.Close()`? Does Go not have RAII?

Does Go have something analogous to Rust's `try!` or `?` operator, which would turn it into (pseudocode):

    contents, err := try!(ioutil.Readall(req.Body))

Or:

    contents, err := ioutil.Readall(req.Body)?

If not, why not?

(I don't know Go)

jimsmart 8 years ago | | |

Perhaps worth pointing out, pedantically, that really only the final two lines are the JSON handling — the first three lines here are reading/handling the input stream (HTTP).

mzzter 8 years ago |

For those fluent in Go first, this is good as a quick Go to Python reference too. Though good as an initial quickstart, this invites programming in Go using a Python-style and vice versa. Glad that there’s at least a section on goroutines and chan.