import json
import os
import uuid

filename = str(uuid.uuid4()) # create random file name

# JSON data to be written
jsonDict ={
    "firstname" : "John",
    "lastname" : "Doe",
    "age" : 30,
    "phonenumber" : "9976770500"
}

# write JSON to file
with open(filename, "w") as f:
    json.dump(jsonDict, f)

# read JSON string from file
f = open(filename, "r")
print(f.read())
f.close()
os.remove(filename)

# Output:
# {"firstname": "John", "lastname": "Doe", "age": 30, "phonenumber": "9976770500"}

package main

import (
    "bufio"
    "fmt"
    "os"
)

func checkErr(err error) {
    if err != nil {
        panic(err)
    }
}

func main() {
    content := "Some content"
    // write a string (or just bytes) into a file
    err := os.WriteFile("/tmp/dfile1", []byte(content), 0644)
    checkErr(err)

    // open a file for writing
    file, err := os.Create("/tmp/dfile2")
    checkErr(err)
    // defer a Close immediately after opening a file
    defer file.Close()

    bytesCount, err := file.Write([]byte(content))
    checkErr(err)
    fmt.Printf("wrote %d bytes\n", bytesCount)

    bytesCount, err = file.WriteString("Some other content\n")
    checkErr(err)
    fmt.Printf("wrote %d bytes\n", bytesCount)
    // flush writes to a stable storage (file system for example)
    file.Sync()

    // bufio provides buffered writers
    writer := bufio.NewWriter(file)
    bytesCount, err = writer.WriteString("Some othe buffered content\n")
    checkErr(err)
    fmt.Printf("wrote %d bytes\n", bytesCount)
    // ensure all buffered operations have been applied to the underlying writer
    writer.Flush()
}