Brython documentation

Problem

Read the content of a file

Solution

We use the built-in function open() to load the file content

import time
from browser import document

fake_qs = '?foo=%s' %time.time()
document['zone'].value = open('file.txt'+fake_qs).read()

Note the query string with a random value at the end of the file name : it is required to refresh the result if the source file is changed between two calls

The next example adds a timeout function to print a message in case the file was not found after 4 seconds :

import time
from browser import ajax, document 

def on_complete(req):
    if req.status==200 or req.status==0:
        document["zone"].value = req.text
    else:
        document["zone"].value = "error "+req.text

def err_msg():
    document["zone"].text = "server didn't reply after %s seconds" %timeout

timeout = 4

def go(url):
    req = ajax.Ajax()
    req.bind("complete", on_complete)
    req.set_timeout(timeout,err_msg)
    req.open('GET',url,True)
    req.send()

go('file.txt?foo=%s' %time.time())

Introduction

Installation

Limitations of the "file" protocol

Frequently asked questions

Syntax, keywords and built-in functions

Standard distribution

`import` implementation

Brython packages

Browser interface

Brython-specific built-in modules

Working with Brython

Cookbook

Problem

Solution