How to solve error pip is not recognized and installation module gtts, pyttsx3,pyaudio, playsound..

How to solve error pip is not recognized as an internal or external command and installation of module pyaudio, pyttsx3, wikipedia..
gTTS

Features
Customizable speech-specific sentence tokenizer that allows for unlimited lengths of text to be read, all while keeping proper intonation, abbreviations, decimals and more;
Customizable text pre-processors which can, for example, provide pronunciation corrections;
Automatic retrieval of supported languages

pyttsx3
pyttsx3 is a text-to-speech conversion library in Python. Unlike alternative libraries, it works offline, and is compatible with both Python 2 and 3.

nsss – NSSpeechSynthesizer on Mac OS X 10.5 and higher

sapi5 – SAPI5 on Windows XP, Windows Vista, and (untested) Windows 7

espeak – eSpeak on any distro / platform that can host the shared library (e.g., Ubuntu / Fedora Linux)
Install with pip (using pyenv, pipenv or virtualenv):

playsound
playsound is a “pure Python, cross platform, single function module with no dependencies for playing sounds.” With this module, you can play a sound file with a single line of code:

Wikipedia is a Python library that makes it easy to access and parse data from Wikipedia.

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