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Ways of installing python module

I'm new to python, about a month.
I know installing python modules can be done by using pip or easy_install. But when I was trying to install the regex module it gave me an error.
Typing pip install re in cmd gave me the following errors;
ERROR: Could not find a version that satisfies the requirement re (from versions: none)
ERROR: No matching distribution found for re
So I went to PyPI and downloaded a file there and now PyCharm doesn't give error when I import the module anymore.
So are there any difference between these ways of downloading Python modules or it doesn't matter ?
I'm using Windows 10 and have Python 3.8 and 3.8.1.

re is a built-in module, therefore you are not required to install this with pip.
Python Built-In Modules

re is part of the Python standard library so there is no need to install it separately. There are many ways to 'install' a package, e.g. using easy_install, pipx, venv, poetry, etc., but pip install --user is likely the way you're going to want to go to get started until you run into a compelling reason to explore other options. Either way, all these tools are essentially just various ways to move packages into PYTHONPATH, the place that Python looks for packages by default.

error when downloading the gensim package in python

I have been trying to install the gensim package in python using pip, using the pip.main(['install','gensim']). It works and starts downloading, but then I get the following error:
THESE PACKAGES DO NOT MATCH THE HASHES FROM THE REQUIREMENTS FILE. If you have updated the package versions, please update the hashes. Otherwise, examine the package contents carefully; someone may have tampered with them.
gensim from https://files.pythonhosted.org/packages/82/f2/c2f2c87ed72483fce010fbfea1a3adbd168c0f0dafc878cbfb5a76381b03/gensim-3.4.0-cp36-cp36m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl#sha256=7bafe3f2fd49738942ef04396cb1e50a38283fe02203e5d4c66588daa01fb87c:
Expected sha256 7bafe3f2fd49738942ef04396cb1e50a38283fe02203e5d4c66588daa01fb87c
Got 728e9e79db209cfb0699c815c30a6169cefa61f46ef3471937100e4173fdbb3d
Any help would be appreciated

It seems like the package pip is trying to download and install is being modified in transit. You should be able to download, verify, and install the package yourself.
Download the package:
$ curl -O https://files.pythonhosted.org/packages/82/f2/c2f2c87ed72483fce010fbfea1a3adbd168c0f0dafc878cbfb5a76381b03/gensim-3.4.0-cp36-cp36m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl
Calculate the SHA256 sum to ensure the package has not been modifed:
$ openssl sha256 gensim-3.4.0-cp36-cp36m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl
The output should be 7bafe3f2fd49738942ef04396cb1e50a38283fe02203e5d4c66588daa01fb87c (according to https://pypi.org/project/gensim/#files)
Install the package:
$ pip install gensim-3.4.0-cp36-cp36m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl

I didn't solve the problem but I found a way to work around this challenge. I started using anaconda directly. I used the navigator to install gensim in my environments, then I used the spyder command prompt to run my codes.
These links are useful:
https://docs.anaconda.com/anaconda/navigator/
https://docs.anaconda.com/anaconda/install/
https://www.anaconda.com/download/#macos

Conda 'ImportError: No module named ruamel.yaml.comments'

Conda gives error when I run any command with it.
Traceback (most recent call last):
File "/usr/local/bin/conda", line 7, in <module>
from conda.cli.main import main
File "/usr/local/lib/python2.7/dist-packages/conda/cli/__init__.py", line 8, in <module>
from .main import main # NOQA
File "/usr/local/lib/python2.7/dist-packages/conda/cli/main.py", line 46, in <module>
from ..base.context import context
File "/usr/local/lib/python2.7/dist-packages/conda/base/context.py", line 18, in <module>
from ..common.configuration import (Configuration, MapParameter, PrimitiveParameter,
File "/usr/local/lib/python2.7/dist-packages/conda/common/configuration.py", line 40, in <module>
from ruamel.yaml.comments import CommentedSeq, CommentedMap # pragma: no cover
ImportError: No module named ruamel.yaml.comments

The module ruamel.yaml.comments will normally be loaded from site-packages/ruamel/yaml/comments.py, and not from site-packages/ruamel_yaml/comments.py
Conda seems to have problems with properly supporting namespaces (ruamel.) which I can only attribute to not (yet) being fully pip compatible. That although "namespaces are a honking good idea", and package namespaces have been around for many years.
Assuming you can extend "conda" installations with pip you could try to do a normal install of ruamel.yaml with:
pip install ruamel_yaml==0.11.14
I would not normally recommend such an old version, but that is more likely to work in combination with the version conda uses itself internally.
The alternative would be to switch to using python and pip without conda, that way you can just use the latest version of software from PyPI.

Try pip install ruamel.yaml
It works for me.

Try conda install ruamel.yaml ... pip didnt work for me

Try sudo pip install ruamel_yaml

I went into this file:
/anaconda2/lib/python2.7/site-packages/dateparser/utils/__init__.py
edited this line:
import ruamel.yaml as yaml
to read
import ruamel_yaml as yaml
Changing the dot to an underscore worked for me.... I hope it works for you.

this worked for me:
pip install --upgrade ruamel.yaml --ignore-installed ruamel.yaml
from an answer in matsci.org
https://matsci.org/t/modulenotfounderror-no-module-named-ruamel/36183

The above answer didn't work for me. I had to do a fresh install of the core conda components as described in the conda docs here. Copy and pasted below:
Issue: My conda is broken and I want to fix it without blowing away the current installation
I am getting a conda error and want to reinstall Miniconda to fix it but when I try, it gives me the error that Miniconda (or Anaconda) is already installed and will not let me continue. I want to force the installation.
Resolution: Install Miniconda using the -f (force) option
Download and install the appropriate Miniconda for your computer operating system from the Miniconda download page using the force or -f option as shown:
bash Miniconda3-latest-MacOSX-x86_64.sh -f
NOTE: Substitute the appropriate filename and version for your
operating system.
NOTE: Be sure that you install to same install location as your
existing install so it overwrites the core conda files and does not
install a duplicate in a new folder.

Go to anaconda3\lib\site-packages\rpcq_base.py
and change line #22 :
from ruamel import yaml
to
from ruamel_yaml as yaml

This might not be a popular answer, but it finally helped me after many hours of troubleshooting:
Uninstall conda (I used this stack overflow solution) and also rm -rf miniconda3 in my home directory, fwiw.
Reinstalled conda using data camp's tutorial.
No other solutions worked for me after lots of head banging.

For python3 use
pip3 install ruamel_yaml
if pip3 not installed try at first
sudo apt install python3-pip

For me this was a conda/pip error. I'd tried to install (cwltool in my case) through pip.
It completed successfully, but then running any command gave me the error like above.
ImportError: No module named ruamel.yaml.
It turned out that the pip binary wasn't part of my conda env and was installing cwltool into a completely separate location.
To resolve the issue I completed the following:
conda activate <env I want to install cwltool into>
conda install -y pip
# Run 'rehash' now if you're using zsh to ensure you're using the right pip
pip install cwltool
cwltool -h

To add to what #user612161 has said, go to the directory of parent module (dateparser in this case) requiring ruamel.yaml:
cd anaconda2/lib/python2.7/site-packages/dateparser
and change all occurrences of ruamel.yaml into ruamel_yaml by the following command (Linux):
find . -name '*.py' | xargs sed -i 's/ruamel.yaml/ruamel_yaml/g'

The quick and easy is to ignore the previously installed version in an upgrade
pip install --ignore-installed ruamel_yaml==0.17.4

I was trying to link Bloomberg to Python
pip install --index-url=https://bcms.bloomberg.com/pip/simple blpapi
pip install xbbg
so far, so good.... then I tried to import a module from the package xbbg:
from xbbg import blp
and I was faced with an error, it couldn't find "ruamel.yaml" within the "param.py" within the xbbg module
When I dug into the folder C:/Anaconda3/Lib/site-packages I could see that there was a folder there called ruamel_yaml so I went back to the param.py file and edited ruamel.yaml to be ruamel_yaml as suggested in other posts.
"from xbbg import blp" now worked and I'm able to take data directly from Bloomberg into Python now. Problem solved.
I have a feeling that this issue is being caused by downloading different versions at different times as I've found the learning curve to get setup on Python difficult with many false starts. I was tearing my hair out a bit because I just got Python up and running linked to Bloomberg on my work pc but when I tried to link Bloomberg up to Python on my laptop it kept getting stuck with the "ruamel" issue. The version of Python on my laptop is much older than the version on my work pc. What makes me think that its a version issue is that I did not have to edit ruamel.yaml to be ruamel_yaml in order for me to link Python and BB.
These are just ideas, I'm too inexperienced at this stage to offer much more than to share what happened.

Python pip argparse upgrade

I have been attempting to upgrade argparse on Ubuntu 16.04 to the latest version, but pip keeps saying that it is part of the standard library.
How can this package be upgraded?
$ sudo pip install argparse --upgrade
Collecting argparse
Using cached argparse-1.4.0-py2.py3-none-any.whl
Installing collected packages: argparse
Found existing installation: argparse 1.2.1
Not uninstalling argparse at /usr/lib/python2.7, as it is in the standard library.
Successfully installed argparse-1.2.1
Thanks.

Argparse is maintained as a separate package here: https://pypi.python.org/pypi/argparse
Which is where pip is going to collect it.
But
As of Python >= 2.7 and >= 3.2, the argparse module is maintained
within the Python standard library. For users who still need to
support Python < 2.7 or < 3.2, it is also provided as a separate
package....
So, you are getting the error because it is part of the standard library, but also available to install via pip if you are using a version of Python for which it isn't.
If you really need to install 1.4.0 try this: (worked for me on my Windows 2.7.11 install)
Download the gzip file, not the wheel, from the pypi downloads page
Uncompress the archive and open a terminal in the argparse-1.4.01 folder
Run python setup.py install (See the 'Install' section of first link)
And check you now have the correct version (hopefully):
>>> import argparse
>>> argparse.__version__
'1.4.0'
Note:
This still leaves the original argparse.py (in ...Python27\Lib for me) intact, and places the 1.4.0 egg in site-packages, with an easy-install.pth file which I presume ensures that this version gets used in preference to the standard library one.

Trouble installing geopy with Python 3.2

I am trying to install a module on python 3.2 but am unable to. I am using Windows 7. I need to have the module installed only on Python 3.2, so solutions that work for other versions of Python won't be helpful to me (I had no problem installing modules in Python 2.7 or 3.3, 3,4) I got rid of all my other versions of python, because I thought that might be the problem.
I have tried both using pip install, and to manually install the package and neither works. At first glance it looks like I am installing setuptools and pip correctly. Here is the output I get when I try to install pip
Installed c:\python32\lib\site-packages\setuptools-7.0-py3.2.egg
Processing dependencies for setuptools==7.0
Finished processing dependencies for setuptools==7.0
PS C:\> python32 .\get-pip.py
Requirement already up-to-date: pip in c:\python32\lib\site-packages
Cleaning up...
PS C:\> pip install geopy
It looks fine, right?
Then when I try to use by entering pip install geopy Here is the output I get
pip: the termpipis not recognized as the name of a cmdlet, function or operable program etc. I made sure that python 3.2 was specified in the path environments, and uninstalled all other versions of pythons. I don't know what else I can do?
I also tried to manually install geopy. I went to the geopy page on github and pressed on "Download ZIP". I then extracted the folder to lib/site-packages directory in python32. When I tried to install using the setup.py (python32 setup.py install) Here is the error message that I got. I am not sure what this error message means
Traceback (most recent call last):
File "setup.py", line 6, in <module>
from geopy import __version__ as version
File "C:\python32\lib\site-packages\geopy-master\geopy\__init__.py", line 10, in <module>
from geopy.location import Location
File "C:\python32\lib\site-packages\geopy-master\geopy\location.py", line 21
def __init__(self, address=u"", point=None, raw=None):

Update: GeoPy 1.6.0 introduced support for Python 3.2, so update it and it should install and work.
Old answer:
This is a bug with geopy, and/or it doesn't support Python 3.2. With this Python release, strings cannot be in the form u"the string", since it is a SyntaxError. This was fixed with PEP-414 for Python 3.3.
While you can install the package, a quick fix for geopy is to edit the installed files to remove the u in several module files, such as "C:\python32\lib\site-packages\geopy-master\geopy\location.py" (as shown in your question).
For example:
Change address=u"" to address=""
Change signature_method=u"HMAC-SHA1" to signature_method="HMAC-SHA1"
Also watch out for single quote changes, e.g. u'the string'
etc.