AWS s3 python sdk code examples

Yet another easy-to-understand, easy-to-use aws s3 python sdk code examples.

github地址：https://github.com/garyelephant/aws-s3-python-sdk-examples.

"""
Yet another s3 python sdk example.
based on boto 2.27.0
"""

import time
import os
import urllib

import boto.s3.connection
import boto.s3.key

def test():
    print ‘--- running AWS s3 examples ---‘
    c = boto.s3.connection.S3Connection(‘<YOUR_AWS_ACCESS_KEY>‘, ‘<YOUR_AWS_SECRET_KEY>‘)

    print ‘original bucket number:‘, len(c.get_all_buckets())

    bucket_name = ‘yet.another.s3.example.code‘
    print ‘creating a bucket:‘, bucket_name
    try:
        bucket = c.create_bucket(bucket_name)
    except boto.exception.S3CreateError  as e:
        print ‘ ‘ * 4, ‘error occured:‘
        print ‘ ‘ * 8, ‘http status code:‘, e.status
        print ‘ ‘ * 8, ‘reason:‘, e.reason
        print ‘ ‘ * 8, ‘body:‘, e.body
        return

    test_bucket_name = ‘no.existence.yet.another.s3.example.code‘
    print ‘if you just want to know whether the bucket(\‘%s\‘) exists or not‘ % (test_bucket_name,),         ‘and don\‘t want to get this bucket‘
    try:
        test_bucket = c.head_bucket(test_bucket_name)
    except boto.exception.S3ResponseError as e:
        if e.status == 403 and e.reason == ‘Forbidden‘:
            print ‘ ‘ * 4, ‘the bucket(\‘%s\‘) exists but you don\‘t have the permission.‘ % (test_bucket_name,)
        elif e.status == 404 and e.reason == ‘Not Found‘:
            print ‘ ‘ * 4, ‘the bucket(\‘%s\‘) doesn\‘t exist.‘ % (test_bucket_name,)

    print ‘or use lookup() instead of head_bucket() to do the same thing.‘,         ‘it will return None if the bucket does not exist instead of throwing an exception.‘
    test_bucket = c.lookup(test_bucket_name)
    if test_bucket is None:
        print ‘ ‘ * 4, ‘the bucket(\‘%s\‘) doesn\‘t exist.‘ % (test_bucket_name,)

    print ‘now you can get the bucket(\‘%s\‘)‘ % (bucket_name,)
    bucket = c.get_bucket(bucket_name)

    print ‘add some objects to bucket ‘, bucket_name
    keys = [‘sample.txt‘, ‘notes/2006/January/sample.txt‘, ‘notes/2006/February/sample2.txt‘,           ‘notes/2006/February/sample3.txt‘, ‘notes/2006/February/sample4.txt‘, ‘notes/2006/sample5.txt‘]
    print ‘ ‘ * 4, ‘these key names are:‘
    for name in keys:
        print ‘ ‘ * 8, name

    filename = ‘./_test_dir/sample.txt‘
    print ‘ ‘ * 4, ‘you can contents of object(\‘%s\‘) from filename(\‘%s\‘)‘ % (keys[0], filename,)
    key = boto.s3.key.Key(bucket, keys[0])
    bytes_written = key.set_contents_from_filename(filename)
    assert bytes_written == os.path.getsize(filename), ‘    error occured:broken file‘

    print ‘ ‘ * 4, ‘or set contents of object(\‘%s\‘) by opened file object‘ % (keys[1],)
    fp = open(filename, ‘r‘)
    key = boto.s3.key.Key(bucket, keys[1])
    bytes_written = key.set_contents_from_file(fp)
    assert bytes_written == os.path.getsize(filename), ‘    error occured:broken file‘

    print ‘ ‘ * 4, ‘you can also set contents the remaining key objects from string‘
    for name in keys[2:]:
        print ‘ ‘ * 8, ‘key:‘, name
        key = boto.s3.key.Key(bucket, name)
        s = ‘This is the content of %s ‘ % (name,)
        key.set_contents_from_string(s)
        print ‘ ‘ * 8, ‘..contents:‘, key.get_contents_as_string()
        # use get_contents_to_filename() to save contents to a specific file in the filesystem.

    #print ‘You have %d objects in bucket %s‘ % ()    

    print ‘list all objects added into \‘%s\‘ bucket‘ % (bucket_name,)
    objs = bucket.list()
    for key in objs:
        print ‘ ‘ * 4, key.name

    p = ‘notes/2006/‘
    print ‘list objects start with \‘%s\‘‘ % (p,)
    objs = bucket.list(prefix = p)
    for key in objs:
        print ‘ ‘ * 4, key.name

    print ‘list objects or key prefixs like \‘%s/*\‘, something like what\‘s in the top of \‘%s\‘ folder ?‘ % (p, p,)
    objs = bucket.list(prefix = p, delimiter = ‘/‘)
    for key in objs:
        print ‘ ‘ * 4, key.name

    keys_per_page = 4
    print ‘manually handle the results paging from s3,‘, ‘ number of keys per page:‘, keys_per_page
    print ‘ ‘ * 4, ‘get page 1‘
    objs = bucket.get_all_keys(max_keys = keys_per_page)
    for key in objs:
        print ‘ ‘ * 8, key.name

    print ‘ ‘ * 4, ‘get page 2‘
    last_key_name = objs[-1].name   #last key of last page is the marker to retrive next page.
    objs = bucket.get_all_keys(max_keys = keys_per_page, marker = last_key_name)
    for key in objs:
        print ‘ ‘ * 8, key.name
    """
    get_all_keys() a lower-level method for listing contents of a bucket.
    This closely models the actual S3 API and requires you to manually handle the paging of results.
    For a higher-level method that handles the details of paging for you, you can use the list() method.
    """

    print ‘you must delete all objects in the bucket \‘%s\‘ before delete this bucket‘ % (bucket_name, )
    print ‘ ‘ * 4, ‘you can delete objects one by one‘
    bucket.delete_key(keys[0])
    print ‘ ‘ * 4, ‘or you can delete multiple objects using a single HTTP request with delete_keys().‘
    bucket.delete_keys(keys[1:])

    print ‘now you can delete the bucket \‘%s\‘‘ % (bucket_name,)
    c.delete_bucket(bucket)

    #references:
    #  [1] http://docs.pythonboto.org/
    #  [2] amazon s3 api references

if __name__ == ‘__main__‘:
    test()

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