@Vile thank only @jonb 😀

Following @JonB advice, this works

.
.
.
        self.last_t = self.t
        
    def update(self):
        #self.sprite.texture=sprite_sheet[1]
        if (self.t-self.last_t) > 0.05:
            #modify_the_sprite
            self.last_t = self.t
.
.
.

@octoshark see last post of this topic

Same error and solution here and here

Found via Google on module 'matplotlib' has no attribute 'cbook'

And the big script also works....

For me, this little script works also if in Pythonista iCloud

import matplotlib.pyplot as plt
x=[1,2]
y=[1,2]
plt.scatter(x,y)
plt.show()

Or IOS 13 bug

@average install piexif.py from here
and try this script

from   datetime import datetime
import dialogs
from   objc_util import ObjCInstance
import os
import photos
import piexif   # https://github.com/hMatoba/Piexif/tree/master/piexif

def exif_as_str(exif_val):
    exif_str = str(exif_val)
    if len(exif_str) >= 3:
        if exif_str[:2] == "b'" and exif_str[-1] == "'":
            exif_str = exif_str[2:-1]
    return exif_str 

def main():
    # select photo
    asset = photos.pick_asset()
    
    # get its path
    path = str(ObjCInstance(asset).pathForOriginalFile())
    #print(path)

    # get photo exifs
    exif_info = piexif.load(path)   
    exif_str = exif_as_str(exif_info['Exif'][piexif.ExifIFD.DateTimeOriginal])
    #print('photo taken date/time',exif_str)

    # get new taken date-time   
    new_date = dialogs.datetime_dialog(title=str(exif_str))
    dt_str = datetime.strftime(new_date,'%Y:%m:%d %H:%M:%S')
    
    # update exif of taken datetime
    exif_info['Exif'][piexif.ExifIFD.DateTimeOriginal] = dt_str 
    exif_str = exif_as_str(exif_info['Exif'][piexif.ExifIFD.DateTimeOriginal])
    #print('modified photo taken date/time',exif_str)

    # create new photo with modified taken date-time    
    exif_bytes = piexif.dump(exif_info)
    new_path = 'temp.jpg'
    piexif.insert(exif_bytes,path,new_file=new_path)
    photos.create_image_asset(new_path)
    os.remove(new_path)
            
#--- protect for import
if __name__ == '__main__':
    main()

If any error, please forgive me and don't forget I'm in holidays In Bourgogne (🍷=>bugs)

@jm2466 this

    # 1) convert PIL Image to ui.Image
    console.hud_alert('convert PIL Image into ui.Image')
    with io.BytesIO() as bIO:
        new_im.save(bIO, 'PNG')
        ui_image = ui.Image.from_data(bIO.getvalue())
    del bIO
    # 2) Create a PHAsset from an ui.Image (not from a PIL Image)
    console.hud_alert('Create a PHAsset from an ui.Image')
    lib = PHPhotoLibrary.sharedPhotoLibrary()
    def change_block():
        req = PHAssetChangeRequest.creationRequestForAssetFromImage_(ui_image)
    def perform_changes():
        lib.performChangesAndWait_error_(change_block, None)
    t = threading.Thread(target=perform_changes)
    t.start()
    t.join()

is about (😀) 1000 x slower than

    path = 'temp.jpg'
    new_im.save(path , quality=95)
    photos.create_image_asset(path)
    os.remove(path)

@jm2466 You could always convert your PIL Image into an ui.Image and use this kind of code to save it in camera roll

# only to have an ui.Image
import ui
img = ui.Image.named('test:Bridge')

# Create a PHAsset from an ui.Image (not from a PIL Image)
from objc_util import *
import threading

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

lib = PHPhotoLibrary.sharedPhotoLibrary()
def change_block():
    req = PHAssetChangeRequest.creationRequestForAssetFromImage_(img)
def perform_changes():
    lib.performChangesAndWait_error_(change_block, None)

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