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Thanks to @omz and @brumm for their help

# coding: utf-8
from objc_util import *
import threading
import photos
import console
import ui

NSBundle.bundleWithPath_('/System/Library/Frameworks/Photos.framework').load()
PHAssetCollection = ObjCClass('PHAssetCollection')
PHAsset = ObjCClass('PHAsset')
PHPhotoLibrary = ObjCClass('PHPhotoLibrary')
PHAssetChangeRequest = ObjCClass('PHAssetChangeRequest')

class MyView(ui.View):

    def will_close(self):
        # Back to home screen
        #webbrowser.open('launcher://crash')
        pass

def select_photos():
    console.clear()
    back = MyView(frame=(0,0,500,500))
    back.present('sheet')
    todels=photos.pick_image(include_metadata=True,original=True,raw_data=False,multi=True)

    # todels = list of tuples
    # [(image,metadata),(image,metadata),...]

    # Build dictionary filename: index
    fn_index = {}
    for ip in range(photos.get_count()):
        m = photos.get_metadata(ip)
        fn = m.get('filename')
        fn_index[fn] = ip
        # that could be a problem if two photos have the same filename, what happens if you download the same file (fi from Dropbox) more than once.

    # pick_image seems to display "camera roll" which seems to be all photos in sequence like
    # - type = 2: smartalbum
    # - subtype = 209: smartalbumlibrary
    result = PHAssetCollection.fetchAssetCollectionsWithType_subtype_options_(2, 209, None)
    coll = result.firstObject()
    assets = PHAsset.fetchAssetsInAssetCollection_options_(coll, None)

    # create array of assets to be deleted  
    a_del = []  
    for todel in todels:
        fn = todel[1].get('filename')
        ia = fn_index[fn] # file name -> index
        a = assets.objectAtIndex_(ia)   
        var filename: String?

        resources = PHAssetResource.assetResourcesForAsset(a)
        filename = resources[0].originalFilename

        a_del.append(a)

    lib = PHPhotoLibrary.sharedPhotoLibrary()
    def change_block():
        # standard delete will ask a confirmation by specifying the number of photos to be deleted but by showing only one
        req = PHAssetChangeRequest.deleteAssets_(a_del)

    def perform_changes():      lib.performChangesAndWait_error_(change_block, None)

    t = threading.Thread(target=perform_changes)
    t.start()
    t.join()

if __name__ == '__main__':
    select_photos()

Your script isn't very useful as you've posted it. There is incorrect indentation throughout, and only bits are formatted as code. Please format the entire section as code by placing three back ticks (`) before and after the code block.

Thanks for your advice, I didn't know that

As the delete action does display only one photo, you could, just before deletion, display as background, a grid of thumbnails of the selected photos.

    # build a grid of thumbnails
    n = len(sel_photos)
    cols = 6  
    rows = int(ceil(n/float(cols)))          
    width = cols * 64
    height = rows * 64
    grid = Image.new('RGB', (width,height),'gray')
    p = 0
    for i in xrange(0,rows):
        for j in xrange(0,cols):
            sel_photo = sel_photos[p]
            fn = sel_photo[1].get('filename')
            ia = fn_index[fn] # filename -> index
            thumb = photos.get_thumbnail(ia)
            thumb = thumb.resize((64,64))
            grid.paste(thumb, (j*64,i*64))
            p += 1
            if p == n:
                break
        if p == n:
            break

    # display grid image en background
    iv = ui.ImageView(frame=(0,0,width,height))
    iv.content_mode = ui.CONTENT_SCALE_ASPECT_FIT
    # convert PIL to ui.Image
    bIO = io.BytesIO()
    grid.save(bIO,'png')
    iv.image = ui.Image.from_data(bIO.getvalue())
    back.add_subview(iv)