Having trouble in installing pypiwin32 via pip - python

I am using Raspbian stretch and i am trying to install Pypiwin32 in Raspberry Pi 3 B+ and when i enter the command pip install pypiwin32 an error showing that:
Collecting pywin32>=223 (from pypiwin32)
Could not find the version that satisfies the requirements pywin32>=223 (from pypiwin32) (from versions: )
No matching distribution found for pywin32>=223 (from pypiwin32)
When i see this error and i download the pypiwin32 file and enter the command python setup.py install it gives an error No module named _winreg.
I am using Python2.7.15.
Please help me.

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Error while trying to install PyQt designer on Macbook

I have installed PyQt5 on my Macbook, however when I try and run the command to install the tools, I am getting an error as follows:
ERROR: Could not find a version that satisfies the requirement pyqt5-plugins<5.15.2.3,>=5.15.2.2 (from pyqt5-tools) (from versions: none)
ERROR: No matching distribution found for pyqt5-plugins<5.15.2.3,>=5.15.2.2 (from pyqt5-tools)
Here is the full input and output:
(base) _-Air:Chess-Final _$ pip3.7 install pyqt5-tools
Collecting pyqt5-tools
Using cached pyqt5_tools-5.15.2.3.0.2-py3-none-any.whl (28 kB)
ERROR: Could not find a version that satisfies the requirement pyqt5-plugins<5.15.2.3,>=5.15.2.2 (from pyqt5-tools) (from versions: none)
ERROR: No matching distribution found for pyqt5-plugins<5.15.2.3,>=5.15.2.2 (from pyqt5-tools)
WARNING: You are using pip version 20.2.3; however, version 20.3.3 is available.
You should consider upgrading via the '/usr/local/bin/python3.7 -m pip install --upgrade pip' command.
I have tried downloading QT designer from its website, but since I want it for personal use, I am not able to get it (it requires company information)
So it turns out that pyqt5-tools is only available for Windows as seen on their site: https://pypi.org/project/pyqt5-tools/
Try an alternative such as QT-creator for Mac: https://www.qt.io/download
This post strongly supports using Homebrew: Python PyQt on macOS Sierra

Error when installing pywin32 (on Ubuntu)

I'm trying to install the pywin32 module on Ubuntu for python 3.6, I've tried pip3 install pywin32 and got the following output:
Collecting pywin32
Could not find a version that satisfies the requirement pywin32 (from versions: )
No matching distribution found for pywin32
Then I tried pip3 install pypiwin32 and got the following output:
Collecting pypiwin32
Using cached https://files.pythonhosted.org/packages/d0/1b/2f292bbd742e369a100c91faa0483172cd91a1a422a6692055ac920946c5/pypiwin32-223-py3-none-any.whl
Collecting pywin32>=223 (from pypiwin32)
Could not find a version that satisfies the requirement pywin32>=223 (from pypiwin32) (from versions: )
No matching distribution found for pywin32>=223 (from pypiwin32)
The pywin32 and pypiwin32 is "Python extensions for Microsoft Windows Provides access to much of the Win32 API, the ability to create and use COM objects, and the Pythonwin environment."
One supported OS is Microsoft Windows, because you can access the Win32 API only from Windows.
Source: https://pypi.org/project/pywin32/

ERROR: Could not find a version that satisfies the requirement <package name>

I am trying to install python modules in my raspberry pi 3B+ which is using Ubuntu Mate. For most of the modules i get the following error all the time
ERROR: Could not find a version that satisfies the requirement
For instance, I tried the following code:
pip install functools_lru_cache
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting functools_lru_cache
ERROR: Could not find a version that satisfies the requirement functools_lru_cache (from versions: none)
ERROR: No matching distribution found for functools_lru_cache
It is not just this package but also pip install backports , pip install soupsieve, etc. Please Help !!!

How to fix "Could not find a version that satisfies the requirement opencv-python"

I am trying to make some basic facial recognition with my raspberry pi using OpenCV-python, however, I am unable to install OpenCV-python using pip3.
I tried to follow this guide
https://pysource.com/2018/10/31/raspberry-pi-3-and-opencv-3-installation-tutorial/
once this didn't work I tried using a fresh os and upgrading python to no avail.
This is what happens when I input the pip3 command
pi#raspberrypi:~ $ pip3 install opencv-python
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting opencv-python
ERROR: Could not find a version that satisfies the requirement opencv-python (from versions: none)
ERROR: No matching distribution found for opencv-python
I expect that opencv-python should start installing

Could not find a version that satisfies the requirement pip (from versions: ) No matching distribution found for pip

I'm a beginner in python.
I already install python 2.7.5 , download get-pip.py file, using cmd and run these command and get this error:
Could not find a version that satisfies the requirement pip (from versions: )
No matching distribution found for pip
Can anyone help?

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