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save dictionary python

python string methods

python find in array

python pause for time

Speech engines with python tutorial

A computer system used to create artificial speech is called a speech synthesizer, and can be implemented in software or hardware products.

A text-to-speech (TTS) system converts normal language text into speech. How can we use speech synthesis in Python?

• Machine Learning Intro for Python Developers
• Master Computer Vision with OpenCV

Pyttsx

Text to speech sample:
 

Install with:

sudo pip install pyttsx

Create the code speech1.py

import pyttsx
engine = pyttsx.init()
engine.say('The quick brown fox jumped over the lazy dog.')
engine.runAndWait()

And execute it with python.

Espeak

Text to speech sample:
 

We can install using:

sudo apt-get install espeak

Create the code speech2.py:

import os
os.system("espeak 'The quick brown fox'")

It is very easy to use, but like pyttsx it sounds very robotic.

gTTS

I found a script on Github that uses the Google speech engine. The script comes with many options and does not speak, instead it saves to an mp3. We added a command to play the mp3 automatically:

os.system("mpg321 out.mp3 -quiet")

Run with:

python gtts.py -s 'Python programming example'

The voice is extremely natural. The only disadvantage is that you need to be connected with the Internet when running this script.

Links

• Jarvis with Python


• Speech recognition using Google Speech API

string methods python

Methods can be applied to Python strings, where a string is somet text between quotes. An example of using the string method replace, which replaces the a sub-string in a string:

s = "Hello World"
s = s.replace("World","Python")
print(s)

Related Course:
Python Programming Bootcamp: Go from zero to hero

Overview
Python includes these useful methods for string manipulation:

sudo pip install gTTS

from gtts import gTTS
import os
tts = gTTS(text='Hello World', lang='en')
tts.save("hello.mp3")
os.system("mpg321 hello.mp3")

#!/usr/bin/env python3
# Requires PyAudio and PySpeech.

import speech_recognition as sr
from time import ctime
import time
import os
from gtts import gTTS

def speak(audioString):
    print(audioString)
    tts = gTTS(text=audioString, lang='en')
    tts.save("audio.mp3")
    os.system("mpg321 audio.mp3")

def recordAudio():
    # Record Audio
    r = sr.Recognizer()
    with sr.Microphone() as source:
    print("Say something!")
    audio = r.listen(source)

    # Speech recognition using Google Speech Recognition
    data = ""
    try:
        # Uses the default API key
        # To use another API key: `r.recognize_google(audio, key="GOOGLE_SPEECH_RECOGNITION_API_KEY")`
        data = r.recognize_google(audio)
        print("You said: " + data)
    except sr.UnknownValueError:
        print("Google Speech Recognition could not understand audio")
    except sr.RequestError as e:
        print("Could not request results from Google Speech Recognition service; {0}".format(e))

    return data

def jarvis(data):
    if "how are you" in data:
        speak("I am fine")

    if "what time is it" in data:
        speak(ctime())

    if "where is" in data:
        data = data.split(" ")
        location = data[2]
        speak("Hold on Frank, I will show you where " + location + " is.")
        os.system("chromium-browser https://www.google.nl/maps/place/" + location + "/&")

# initialization
time.sleep(2)
speak("Hi Frank, what can I do for you?")
while 1:
    data = recordAudio()
    jarvis(data)

gui in python

To create a graphical interface (GUI) in Python you need to make use of a library or module.  There are at least three widely used modules for creating GUIs with Python:

• Tkinter
• PyQt4
• PyQT5
• WxWidgets (WxPython)

Related course:

• Create GUI Apps with PyQt5

GUI toolkits

QT4 and QT5 are developed by the Qt company.  Graphical applications made with QT4 or QT5 run on Windows, Linux/X11 and Mac OS X.  It has tons of widgets including tabs, buttons, item views, table views, progressbars, input fields, calendar views and many more. Compared to Tk it has a lot more widgets available.

WxPython is a module that creates a native GUI look regardless of the operating system used. On Windows it will look as windows application while on Mac OS it will look as a Mac application. This can be a clear advantage compared to QT4 or Tk, depending on your purpose. WxWidgets has many widgets available such as buttons, menu, text but also more advanced widgets as a htmlview or tree control.

A window created with wxPython. wxPython has native appearance on all operating systems.