python-golang-p1

This week I had to update several spreadsheets…. again donkey job, again try to work smarter. So there was a pattern, and I knew I could copy/paste to the spreadsheet all changes (192 changes per file…). So decided to create a python script to generate the output I needed. It was just new hostnames for devices. So it wasnt really difficult. Although I had to search for basic stuff like how to make a for loop in python. That’s what happens when yo dont use thing often.

Anyway, I managed to get my basic python script. And I could copy paste the output to the spreadsheet just fine.

$ cat rename.py 
for x in range(137,141):
    print("router-p1-r" + str(x) + "01")
    print("router-p1-r" + str(x) + "02")
    print("router-p1-r" + str(x) + "03")
    print()
$ 
$ python rename.py 
router-p1-r13701
router-p1-r13702
router-p1-r13703

router-p1-r13801
router-p1-r13802
router-p1-r13803

router-p1-r13901
router-p1-r13902
router-p1-r13903

router-p1-r14001
router-p1-r14002
router-p1-r14003

But now, I have been trying to learn golang (even though I dont master python neither bash….) and I thought this was a basic stuff to try in golang too. So again, I had to search for basic stuff. How to create a range: link. How to concatenate a string and a integer: link.

So managed to get this and looks like it does the same job:

$ cat rename.go 
package main

import "fmt"

func main() {
	for i := 137; i <= 141; i++ {
		fmt.Println(fmt.Sprint("router-p1-r", i, "01"))
		fmt.Println(fmt.Sprint("router-p1-r", i, "02"))
		fmt.Println(fmt.Sprint("router-p1-r", i, "03"))
		fmt.Println()
	}
}
$ 
$ go run rename.go 
router-p1-r13701
router-p1-r13702
router-p1-r13703

router-p1-r13801
router-p1-r13802
router-p1-r13803

router-p1-r13901
router-p1-r13902
router-p1-r13903

router-p1-r14001
router-p1-r14002
router-p1-r14003

router-p1-r14101
router-p1-r14102
router-p1-r14103

So got the same result in both languages. Keep going!

Vim + Golang

I am trying to learn a bit of golang (although sometimes I think I should try to master python and bash first..) with this udemy course.

The same way I have pyenv/virtualenv to create python environments, I want to do the same for golang. So for that we have goenv:

Based on goenv install instructions and ex-collegue snipset, this is my goenv snipset in .bashrc:

########################
# Go configuration
########################
#
# git clone -b v0.0.4 https://github.com/wfarr/goenv.git $HOME/.goenv
if [ ! -d "$HOME/.goenv" ]; then
    git clone https://github.com/syndbg/goenv.git $HOME/.goenv
fi

if [ -d "$HOME/.goenv"   ]
then
    export GOENV_ROOT="$HOME/.goenv"
    export PATH="$GOENV_ROOT/bin:$PATH"
    if  type "goenv" &> /dev/null; then
        eval "$(goenv init -)"
        # Add the version to my prompt
        __goversion (){
            if  type "goenv" &> /dev/null; then
                goenv_go_version=$(goenv version | sed -e 's/ .*//')
                printf $goenv_go_version
            fi
        }
        #PS1_GO="go:\$(__goversion) "
        export PS1="go:\$(__goversion)|$PS1"
        export PATH="$GOROOT/bin:$PATH"
        export PATH="$PATH:$GOPATH/bin"
    fi
fi

################## End GoLang #####################

From time to time, remember to go to ~.goenv and do a “git pull” to get the latest versions of golang.

Ok, once we can install any golang version, I was thinking about the equivalent to python virtualenv, but it seems it is not really needed in golang. At the moment, I am super beginner so no rush about this.

And finally, as I try to use VIM for everything so I can keep learning, I want to use similar python plugins for golang. So I searched and this one looks quite good: vim-go

So I updated vundle config in .vimrc:

Plugin 'fatih/vim-go', { 'do': ':GoUpdateBinaries' }

Then install the new new plugin once in VIM.

:PluginInstall

or >

:PluginUpdate

There is a good tutorial you can follow to learn the new commands.

I am happy enough with “GoRun”, “GoFmt”, “GoImports”, “GoTest”

Keep practising, Keep learning.