Hi Friends,
After a long time, I was writing code in pythonista, to help learn, playing piano notes.
I am sure this may not be the optimal solutiion. But it works, and I am always ready to
learn from the experts here. Thank You!

# to learn playing piano keys from phone display
# not scaled for ipad
import ui
import sound
import time
from random import choice
from scripter import script, start_scripter

td=1 # default time delay 1 sec

# piano keys from A3 to G4# are Available with following names (21 keys)
piano_klist = [
        "piano:C3", "piano:C3#", 
        "piano:D3", "piano:D3#", "piano:E3", 
        "piano:F3", "piano:F3#", 
        "piano:G3", "piano:G3#", 
        "piano:A3", "piano:A3#", "piano:B3",
        "piano:C4", "piano:C4#", 
        "piano:D4", "piano:D4#", "piano:E4", 
        "piano:F4", "piano:F4#", 
        "piano:G4", "piano:G4#"
        ]

# to load sound effects for minimum latency
for key_name in piano_klist:
    sound.load_effect(key_name)

def slider_action(sender):
    global td
    # to set slider value reversed, so that
    # bpm can go up sliding towards right
    td = round(((1-sender.value)*1.75)+0.2, 2)
    bpm=int (60/td)
    lb.text= str(bpm) + ' BPM'
    # I put this here hoping it will avoid keyboard popping up
    # and covering the display area
    ui.end_editing()

# very important to update label with name of music note
@script
def rnd_note(sender):
    # set to practice for 12 notes at a time
    repeat = 12
    for note in range(repeat):
        key_name = choice(piano_klist)
        time.sleep(td)
        lb1.text = key_name[6:]
        sound.play_effect(key_name)
        yield
    time.sleep(td)
    lb1.text = '♫'
    lb.text = 'Tempo Slider'

w,h = ui.get_screen_size()
# if in landscape mode
if w>h:
    w,h=h,w
gap = 10

v = ui.View(name='Piano Practice', bg_color = 'lightyellow')
v.frame = (gap,gap,w,h)
start_scripter(v)

lb = ui.Label(name = 'mylabel')
lb.frame=(gap*2, 10, w-4*gap, 30)
lb.background_color='gray'
lb.text_color = 'yellow'
lb.font = ('Helvetica', 18)
lb.text = 'Set Tempo BPM'
lb.alignment =1
lb.flex = 'W'

slider = ui.Slider()
slider.value=0.5
slider.frame=(gap*2,gap+32,w-4*gap,50)
slider.background_color='gray'
slider.flex = 'W'
slider.action = slider_action
    
lb1 = ui.Label(name = 'note')
lb1.frame= (gap*2, gap+100, w-4*gap, h-475)
lb1.font = ('Helvetica', 150 )
lb1.text_color = 'yellow'
lb1.alignment =1
lb1.background_color = 'gray'
lb1.text = '♫'
lb1.flex = 'W'

button = ui.Button(name='start')
button.frame = (gap*2, 300, w-4*gap, 40)
button.bg_color='yellow'
button.border_width=1
button.title='Start'
button.font = ('Helvetica', 18)
button.flex = 'W'
button.action=rnd_note

v.add_subview(slider)
v.add_subview(lb)
v.add_subview(lb1)
v.add_subview(button)

v.present('sheet')

I use both Carnets and Pyto, and love both of them.
But I am not an advanced user so they help me learn Jupiter Notebooks (Carnets)
And both can run Pandas, which is superb.
Pyto is updated regularly and runs 3.8 version of Python

I Am Using Pythonista On My iPad Pro And I Have No Issues At All, It Works Fine.

I love Pythonista, and learned a lot of Python on the go..
Apart from pythonista, i am enjoying Pyto (with Python3.8) and Carnets (Like Jupyter Notebooks), especially, as both of these work with Pandas.

Thank you @cvp for all your help and @Phuket2 for filtering code.
I have put up the fully working version below.
I use this to order a lot of books for our bookstore.
I have the csv data file with a few thousand records of book title and book author.

import ui

items = [
    ['Pretty Woman', 'Julia Roberts'],  
    ['Seven Year Itch', 'Marilyn Monroe'],
    ['Casablanca' , 'Ingrid Bergman'],
    ['Roman Holiday','Audrey Hepburn'],
    ['African Queen','Katherine Hepburn'],
    ['Out Of Africa','Meryl Streep'],
    ['Cleopatra','Elizabeth Taylor'],
    ['Titanic','Kate Winslet'],
    ['Apartment','Shirley MacLaine'],
    ['West Side Story','Natalie Wood'],
    ['Rear Window','Grace Kelly'],
    ['Pillow Talk','Doris Day'],
    ['Sound Of Music','Julie Andrews'], 
    ['Love Story','Ali McGraw'],
    ['You Got Mail','Meg Ryan'],
    ['Clueless','Alicia Silverstone'],
    ['Great Gatsby','Mia Farrow'],
    ['Mask','Cameron Diaz'],
    ['Kill Bill', 'Uma Thurman'],
    ]

w,h = ui.get_screen_size()
h=h-64
gap = 5
fontsize = 15 if w<750 else int((w / 75) + 16)

class MyTableViewDataSource (object):
    def tableview_cell_for_row(self, tableview, section, row):
        row_title, row_description = tableview.data_source.items[row]
        # 'subtitle'-style cells come with a built-in secondary label
        cell = ui.TableViewCell('subtitle')
        cell.text_label.text = row_title
        cell.text_label.text_color = 'blue'
        cell.detail_text_label.text = row_description
        cell.detail_text_label.text_color = 'slateblue'
        return cell
     
    def tableview_number_of_rows(self, tableview, section):
        return len(tableview.data_source.items)
        
class MyTableViewDelegate (object):
        def tableview_did_select(self, tableview, section, row):
            main, desc = tableview.data_source.items[row]
            print(f'{main}, {desc}')
            
class MyTextFieldDelegate (object):
    items = items or []
    def textfield_did_change(self, textfield):
        self.filter_data(textfield.text)

    def filter_data(self, filter_text=''):
        ft = filter_text.lower()
        if not len(ft):
            tbl.data_source.items = self.items
            tbl.reload()
        else:
            tbl.data_source.items = [s for s in self.items if (ft in s[0].lower()) or (ft in s[1].lower())]
            tbl.reload()
    
view = ui.View(name='Filter Items', frame =(0,0,w,h), bg_color='slateblue')

tf = ui.TextField(frame=(gap,gap,w-gap*2,32), flex='w', placeholder='Search', clear_button_mode='always')
tf.delegate = MyTextFieldDelegate()
view.add_subview(tf)
    
tbl = ui.TableView(frame=(gap,42,w-gap*2,h-42), corner_radius=3, flex='wh')
tbl.row_height=fontsize*2.5
tbl.name = 'Item Table'
tbl.separator_color = 'grey'
tbl.data_source = MyTableViewDataSource()
tbl.data_source.items = items
tbl.delegate = MyTableViewDelegate()
view.add_subview(tbl)

view.present('sheet', title_bar_color= 'slateblue')

Thank You Very Much For The Prompt Reply @cvp !
I can figure it out now. :)

@foundjem
No, it does not.
So I use 'carnets' app which has support of most modules including pandas.
carnets is jupyter notebooks on iOS, it is great and free.. a little quirky, though :)

Hi Friends,
I am trying to use a filter which must update the data source continuously in my tableview.
I figured it out for ui.LitsDataSource but i have wasted a couple of days trying to do the same with
MyTableViewDataSource method.
This filter was shown by a kind friend @Phuket2 about 2 years ago.
It was must a very simple mistake i am making, tried using reload() method too.
Here is my program, forgive the sloppiness..
Thank you.

# filtering data with two items per record
# example with tableview cells with subtitles
# And TableView Delegate method

import ui

items = [
    ['Pretty Woman', 'Julia Roberts'],  
    ['Seven Year Itch', 'Marilyn Monroe'],['Casablanca' , 'Ingrid Bergman'],
    ['Roman Holiday','Audrey Hepburn'],
    ['Sound Of Music','Julie Andrews'], 
    ['Love Story','Ali McGraw'],
    ['You Got Mail','Meg Ryan'],
    ['Clueless','Alicia Silverstone'],
    ['Great Gatsby','Mia Farrow'],
    ['Mask','Cameron Diaz']     
    ]

w,h = ui.get_screen_size()
h=h-64
gap = 5
fontsize = 15 if w<750 else int((w / 75) + 16)

def reload_data():
    tbl.data_source.reload()

class MyTableViewDataSource (object):
    def tableview_cell_for_row(self, tableview, section, row):
        row_title, row_description = items[row]
        # 'subtitle'-style cells come with a built-in secondary label
        cell = ui.TableViewCell('subtitle')
        cell.text_label.text = row_title
        cell.text_label.text_color = 'blue'
        cell.detail_text_label.text = row_description
        cell.detail_text_label.text_color = 'slateblue' #'#555'
        return cell
     
    def tableview_number_of_rows(self, tableview, section):
        return len(items)
        
class MyTableViewDelegate (object):
        def tableview_did_select(self, tableview, section, row):
            print(f'{items[row][0]}, {items[row][1]}')
            
class MyTextFieldDelegate (object):
    items = items or []
    def textfield_did_change(self, textfield):
        self.filter_data(textfield.text)

    def filter_data(self, filter_text=''):
        ft = filter_text.lower()
        if not len(ft):
            tbl.data_source.items = self.items
        else:
            for s in self.items:
                if ft in (s[0].lower()) or ft in (s[1].lower()):
                    tbl.data_source.items = s
                    ## Need this to be updated
                    ## in the tableview 
    
view = ui.View(name='Filter Items', frame =(0,0,w,h), bg_color='slateblue')

tf = ui.TextField(frame=(gap,gap,w-gap*2,32), flex='w', placeholder='Search', clear_button_mode='always')
tf.delegate = MyTextFieldDelegate()
view.add_subview(tf)
    
tbl = ui.TableView(frame=(gap,42,w-gap*2,h-42), corner_radius=3, flex='wh')
tbl.row_height=fontsize*2.5
tbl.name = 'Item Table'
tbl.separator_color = 'grey'
tbl.data_source = MyTableViewDataSource()
tbl.delegate = MyTableViewDelegate()
view.add_subview(tbl)

view.present('sheet', title_bar_color= 'slateblue')

Love Pythonista And Love Reddit.
I think the biggest advantage in moving to Reddit would be getting a more intelligent search, searching in this forum is not good.
I am no expert but i see no downside to shifting to Reddit.

HI @sulcud,
Mindnotes app, looks interesting,
could you please put up the english version,
when you are free.
Thank you

@ccc
Beauty !

@Phuket2 ,
Thank you very much for the tip.
I would also like to thank you for your old post on the same topic at
https://forum.omz-software.com/topic/3401/share-using-draw_snapshot-method
which i saw after i posted this thread.
Sometimes searching is very difficult in this forum. :)
Take Care

@cvp ,
Thank You Very Much, Exactly What I Wanted.. :)

HI,
I am sure this is a basic question..
i want the simplest way to save the puzzle generated on the console to be saved as an image.
I tried reading through ImageContext, Image, ctx etc but failed to understand.
Please help..

For eg. let's say i want to save this display as an image..

# save display
import ui

w,h = ui.get_screen_size()
view = ui.View(name = 'Grid', bg_color=1)
view.add_subview(ui.View(name='left', frame=(0,0,w/3,h/5), bg_color='blue'))
view.add_subview(ui.View(name='right', frame=(w*2/3,0,w/3,h/5), bg_color='red'))
view.present('sheet')

Thank you very much @ccc for your constant support and prompt help.

Yes, I found some old file, i had named matplotlib.py ,
I have renamed it and now everything works fine.
Silly mistake on my part when i started with pythonista.

Hi,
I often get "cannot import name 'pyplot' error"
when i try to import matplotlib

As a work around, I go to Examples folder and run any plotting example, then it works,
after which i can import matplotlib normally.

The error states something about "frozen importlib._bootstrap"
How can i avoid this error, in pythonista 3

Thank you.

# Histogram
# Basic plot
import numpy as np
import matplotlib.pyplot as plt
height = [3, 12, 5, 18, 45]
bars = ('A', 'B', 'C', 'D', 'E')
y_pos = np.arange(len(bars))
plt.bar(y_pos, height, color=(0.2, 0.4, 0.6, 0.6))
 
# Custom Axis title
plt.xlabel('X Axis Title', fontweight='bold', color = 'red', fontsize='17', horizontalalignment='center')
plt.show()```

Hope this helps..

# sets date time picker
# you can get details of different parameters from strftime.org
import datetime, ui
date_picker = ui.DatePicker(bg_color=1)
date_picker.mode = ui.DATE_PICKER_MODE_DATE_AND_TIME
date_picker.date = datetime.datetime.strptime('01/03/1958-07:00:PM', '%d/%m/%Y-%I:%M:%p')
date_picker.present()

Hi,
I wrote a small utility for this.. hope you find it useful.

https://forum.omz-software.com/topic/4328/modules-of-pythonista-displayed-with-help