Sequencer en python


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PDF Sequence Iteration in Python

Sequence Iteration in Python Mapping is itself an instance of a general pattern of computation: iterating over all elements in a sequence To map a function over a sequence we do not just select a particular element but each element in turn This pattern is so common that Python has an additional control statement to process sequential data

PDF Exploring Data Using Python 3 Dr Charles R Severance

uses and simple examples of Python for data analysis including regular expressions for searching and parsing automating tasks on your computer retrieving data across the network scraping web pages for data object-oriented programming

PDF Python Tutorial

9/7/2016 CIS 519 - Python Tutorial Objects Python treats all data as objects Identity Memory address: Does not change Type Does not change Value Mutable: value can be changed (e g [12]) - Has both deep and shallow copy methods Immutable: value cannot be changed after creation (e g (12)) - Only has shallow copy Equality

PDF Build a step sequencer using Python

Make the synthetizer play notes using Python Modify and turn notes on / off to create a sequence Implement "step by step" and "live" modes

PDF Sequences in Python

Sequences in Python A sequence is an ordered collection of data values Unlike a pair which has exactly two elements a sequence can have an arbitrary (but finite) number of ordered elements The sequence is a powerful fundamental abstraction in computer science

PDF CSC326 Python Sequences

CSC326 Python Sequences Contents Agenda while Statement Sequence Overview String Lists Dictionary Tuples What We have Learned for Sequences Sequences are Objects List Comprehension Cross product of two sets Accessing Matrics Prime Number with List Comprehension Quick Sort Recap 2 2 4 5 7 9 10 10 11 12 12 12 12 Agenda iteration construct sequences

  • Pour stocker en mémoire une valeur dans une variable, on utilise simplement le signe égal = .
    Dans cet exemple, on a mis en mémoire trois variables.
    Dans a , on a stocké la valeur 3, dans b la valeur 7 et dans c la valeur 12.
    Remarque importante : ce qui est stocké est le résultat du calcul et non le calcul.

  • Comment afficher le contenu d'un tableau en Python ?

    En Python, pour accéder à une case d'un tableau, il suffit de placer son indice entre crochets suite à l'appel du tableau.

  • Comment parcourir un tableau en Python ?

    Pour parcourir un tableau en contrôle de flux, on utilise l'instruction for elt in Tab.
    L'instruction for elt in Tab permet d'affecter successivement à la variable elt chaque élément du tableau Tab.
    Si Tab=[1, 2, 5, 7], for elt in Tab signifie que que elt prend successivement les valeurs 1, 2, 5 et 7.

  • Comment afficher un tuple Python ?

    Comme pour les listes, pour accéder à un élément d'un tuple, il faut utiliser les crochets et préciser l'index de l'élément.
    Comme pour les listes, il est possible d'utiliser un index négatif pour compter à partir de la fin du tuple.
    Le dernier élément a l'index -1.

  • Les séquences en Python Il est possible de "stocker" plusieurs grandeurs dans une même structure, ce type de structure est appelé une séquence. De façon plus précise, nous définirons une séquence comme un ensemble fini et ordonné d'éléments indicés de 0 à n-1 (si cette séquence comporte n éléments).

    PART 1: BACKGROUND

    Musical instruments Synthetizers and samplers Sequencers Step sequencers archive.fosdem.org

    MUSICAL INSTRUMENTS

    Can be played by humans Some can be "played" by computers: Synthetizers Samplers archive.fosdem.org

    SYNTHETIZERS

    Sound generators Lots of parameters can be tweaked archive.fosdem.org

    SAMPLERS

    Do not generate sounds themselves Play samples (little chunks of sound) archive.fosdem.org

    SAMPLES / NOTES:

    One sample for the whole keyboard (pitch adjusted or not) One sample for each note One sample for a group of notes, pitch is ajusted archive.fosdem.org

    SEQUENCERS

    Play a sequence of notes Several tracks, instruments

    USING A STEP SEQUENCER

    "Step by step" mode: for each step, define the note attributes. No timing, no rush "Live" mode: turn steps on and off in real time, adjust pitch, length

    PART 2: THE PROJECT

    Project goals MIDI Using mido The Dirty Part: blocking, threads, asyncio

    PROJECT GOALS

    Make the synthetizer play notes using Python Modify and turn notes on / off to create a sequence Implement "step by step" and "live" modes Change tempo in real time Make interactions possible with any controller

    WE WILL NEED TO SPEAK MIDI WITH DEVICES

    Midi input: pads pressed, keys pressed, knobs turned

    MIDI INPUT: RECEIVING MESSAGES

    Message reception blocks So if we want to do something else in parallel, we have to handle this in a thread or coroutine or

    ALIGNING NOTES (STEPS) WITH TEMPO

    Naive implementation: Two problems: time.sleep also blocks, so we have to handle it in a thread or coroutine or

    SOLUTIONS

    Threads Many queues to avoid shared state Coroutines with asyncio Everything in a single thread, less concurrency issues Ok since our app is I/O bound

    PROPOSED DESIGN

    Main process is I/O bound Console process is CPU bound archive.fosdem.org

    PART 3: IMPLEMENTATION & DEMO

    System overview Implementing a controller Action SYSTEM OVERVIEW archive.fosdem.org

    IMPLEMENTING A CONTROLLER

    Map messages from controller (pad pressed) to sequencer actions (toggle step) Send messages to controller for feedback (LEDs

    INTERPRETING EVENTS FROM CONTROLLERS

    Some events are represented by a single message Others are the result of a sequence of messages (ex: NPRN LSB, MSB) archive.fosdem.org

    BENEFITS

    Easy to read, easy to write The dynamic features of Python and plugin system make writing controllers easy Large ecosystem archive.fosdem.org

    CHALLENGES

    Python is not the best choice for real-time computing Performance on tiny devices (C.H.I.P, Rpi

    WHERE IS MY CPU?

    Rules evaluation engine: Speed can be improved: PyPy, Cython, Numba

    FUTURE PLANS

    Chords (especially important for a drum machine

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    PDF Cours de Python

    PDF Programmer en Python - univ-rennes1.fr

    PDF Introduction à la programmation en langage Python - LRI

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    C'est quoi une séquence en Python ?

    Les séquences en Python Il est possible de "stocker" plusieurs grandeurs dans une même structure, ce type de structure est appelé une séquence.
    . De façon plus précise, nous définirons une séquence comme un ensemble fini et ordonné d'éléments indicés de 0 à n-1 (si cette séquence comporte n éléments).

    Comment parcourir un tableau en Python ?

    Parcourir en utilisant la méthode range() La méthode range() peut être combinée avec la méthode for pour afficher les éléments d'un tableau en python. debut: ce paramètre est pour définir l'indice du début. fin; ce paramêtre est pour définir l'indice de fin de la séquence à afficher.

    C'est quoi un tuple en Python ?

    Il permet de créer une collection ordonnée de plusieurs éléments.
    . En mathématiques, on parle de p-uplet.
    . Par exemple, un quadruplet est constitué de 4 éléments.
    . Les tuples ressemblent aux listes, mais on ne peut pas les modifier une fois qu'ils ont été créés.

    Comment comparer deux listes sur Python ?

    Pour tester si deux listes sont identiques, il suffit d'utiliser l'opérateur d'égalité (==).
    . Deux listes sont égales si elles poss?nt le même nombre d'éléments et que ceux situés aux mêmes indices sont égaux.
    . On peut également comparer deux listes en utilisant les opérateurs >, <, >= et <=.










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