python - Why does Go's map iteration order vary when printing?

Question

package main

import "fmt"

func main(){
    sample := map[string]string{
    "key1":"value1",
    "key2":"value2",
    "key3":"value3",
    }
    for i := 0;i<3;i++{
        fmt.Println(sample)
    }
}

The above go code just print a map[string]string three times.

I expect it to a fixed output,but it shows as the following:

map[key3:value3 key2:value2 key1:value1]
map[key1:value1 key3:value3 key2:value2]
map[key2:value2 key1:value1 key3:value3]

It varies!

while in python:

#!/bin/env python
#encoding=utf8

sample = {
    "key1":"value1",
    "key2":"value2",
    "key3":"value3",
}
for i in range(3):
    print sample

OutPut:

{'key3': 'value3', 'key2': 'value2', 'key1': 'value1'}
{'key3': 'value3', 'key2': 'value2', 'key1': 'value1'}
{'key3': 'value3', 'key2': 'value2', 'key1': 'value1'}`

Answer 1

Waitting for answers