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ModuleNotFoundError: No module named 'mercantile' [duplicate]

I had PyQt4 running fine with python2 on Ubuntu 12.04. I then installed python-PySide. But the installation test would give me a module not found error. Then I installed python3-PySide and it works fine. So obviously something to do with my environment paths, but I'm not sure what I need to do. I'm guessing PySide is automatically checking if python3 exists and if it does then it'll use it regardless. I need PySide to work with python2.7 because of Qt4.8 compatibility issues. Any suggestions?
some info about my system:
which python
/usr/bin/local/python
which python3
/usr/bin/python3
EDIT:
More details about installation test.
After installation, I bring up the python console and try import PySide, as follows:
python
import PySide
ImportError: No module name PySide
But it works fine for python3:
python3
import PySide
PySide.version
'1.1.2'

You have two independent Python 2.7 installations, one in /usr and one in /usr/local. (And that's on top of the Python 3.x installation you also have.)
This is bound to cause confusion, especially for novices. And it has caused exactly the kind of consuion it was bound to cause.
You've installed PySide into the /usr installation, so it ended up in /usr/lib/python2.7/dist-packages. If you run /usr/bin/python, that import PySide will probably work fine. (If not, see below.)
But the default thing called python and python2.7 on your PATH is the /usr/local installation, hence which python says /usr/local/bin/python, so it can't see PySide at all. So you need to get it installed for the other Python as well.
Unless you know that you need a second Python 2.7 in /usr/local for some reason, the simplest thing to do would be to scrap it. Don't uninstall it and reinstall it; just uninstall it. You've already got a Python 2.7 in /usr, and you don't need two of them.
If you really need to get PySide working with the second 2.7…
Since you still haven't explained how you've been installing PySide despite being asked repeatedly, I can't tell you exactly how to do that. But generally, the key is to make sure to use explicit paths for all Python programs (python itself, python-config, pip, easy_install, etc.) that you have to run. For example, if the docs or blog or voices in your head tell you to run easy_install at some step, run /usr/local/bin/easy_install instead. If there is no such program, then you need to install that. The fact that you already have /usr/bin/easy_install doesn't help—in fact, it hurts.
If you can get rid of the second Python, but that doesn't fix PySide yet, uninstall, rebuild, and reinstall PySide. Or, even simpler… PySide has pre-made, working binary Ubuntu packages for all of the major Python versions that have Ubuntu packages. Just install it that way.

IDLE and python is different, not able to install modules properly

thanks for reading this. I am using macOS High Sierra. I am not very familiar with terminal or environment variables, but am trying to learn more. From reading other threads and google, it seems like I either have multiple pythons installed, or have pythons running from different paths. However I am not able to find a solution to resolving this, either by re-pathing my IDLE or deleting it entirely.
I do have python, python launcher, and anaconda (not very sure how anaconda works, have it installed a few years back and didn't touch it) installed. I am trying to install pandas (pip install pandas), which tells me that I have it installed, but when I run it on IDLE, it says module not found. Though if i run python3 on terminal and type my code in, it works (so pandas has indeed been installed).
When i run which python on terminal, it returns
/Users/myname/anaconda3/bin/python
(when i enter into this directory from terminal, it shows that in the bin folder, I have python, python.app, python3, python3-config, python3.7, python3.7-config, python3.7m, python3.7m-config)
When i run which idle on terminal, it returns
/usr/bin/idle (im not even sure how to find this directory from the terminal)
When i run import os; print(os.path) on IDLE, it returns module 'posixpath' from '/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/posixpath.py'
Would really appreciate some help to figure out how to ensure that when i install modules from terminal, it would be installed into the same python as the one IDLE is using. Also, I would like to know whether it is possible for me to work on VSCode instead of IDLE. I cant seem to find suitable extensions for data science and its related modules (like statsmodels, pandas etc). Thanks a lot!

First of all, a quick description of anaconda:
Anaconda is meant to help you manage multiple python "environments", each one potentially having its own python version and installed packages (with their own respective versions). This is really useful in cases where you would like multiple python versions for different tasks or when there is some conflict in versions of packages, required by other ones. By default, anaconda creates a "base" environment with a specific python version, IDLE and pip. Also, anaconda provides an improved way (with respect to pip) of installing and managing packages via the command conda install <package-name>.
For the rest, I will be using the word "vanilla" to refer to the python/installation that you manually set up, independent of anaconda.
Explanation of the problem:
Now, the problem arises since you also installed python independently. The details of the problem depend on how exactly you set up both python and anaconda, so I cannot tell you exactly what went wrong. Also, I am not an OSX user, so I have no idea how python is installed and what it downloads/sets alongside.
By your description however, it seems that the "vanilla" python installation did not overwrite neither your anaconda python nor anaconda's pip, but it did install IDLE and set it up to use this new python.
So right now, when you are downloading something via pip, only the python from anaconda is able to see that and not IDLE's python.
Possible solutions:
1. Quick fix:
Just run IDLE via /Users/myname/anaconda3/bin/idle3 every time. This one uses anaconda's python and should be able to see all packages installed via conda install of pip install (*). I get this is tiresome, but you don't have to delete anything. You can also set an "alias" in your ~/.bashrc file to make the command idle specifically linking you there. Let me know with a comment if you would like me to explain how to do that, as this answer will get too long and redundant.
2. Remove conda altogether (not recommended)
You can search google on how to uninstall anaconda along with everything that it has installed. What I do not know at this point is whether your "vanilla" python will become the default, whether you will need to also manually install pip again and whether there is the need to reinstall python in order for everything to work properly.
3. Remove your python "vanilla" installation and only use anaconda
Again, I do not know how python installation works in OSX, but it should be reasonably straightforward to uninstall it. The problem now is that probably you will not have a launcher for IDLE (since I am guessing anaconda doesn't provide one on OSX) but you will be able to use it via the terminal as described in 1..
4. Last resort:
If everything fails, simply uninstall both your vanilla python (which I presume will also uninstall IDLE) and anaconda which will uninstall its own python, pip and idle versions. The relevant documentation should not be difficult to follow. Then, reinstall whichever you want anew.
Finally:
When you solve your problems, any IDE you choose, being VScode (I haven't use that either), pycharm or something else, will probably be able to integrate with your installed python. There is no need to install a new python "bundle" with every IDE.
(*): Since you said that after typing pip install pandas your anaconda's python can import pandas while IDLE cannot, I am implying in my answer that pip is also the one that comes with anaconda. You can make sure this is the case by typing which pip which should point to an anaconda directory, probably /Users/myname/anaconda3/bin/pip

First: This would be a comment if I had enough reputation.
Second: I would just delete python. Everything. And reinstall it.

To repeat and summarized what has been said on various other question answers:
1a. 3rd party packages are installed for a particular python(3).exe binary.
1b. To install multiple packages to multiple binaries, see the option from python -m pip -h.
To find out which python binary is running, execute import sys; print(sys.executable).
3a. For 3rd party package xyz usually installed in some_python/Lib/site-packages, IDLE itself has nothing to do with whether import xyz works. It only matters whether xyz is installed for 'somepython' (see 1a).
3b. To run IDLE with 'somepython', run somepython -m idlelib in a terminal or console.
somepython can be a name recognized by the OS or a path to a python executable.

I've installed a GUI app to run with pip, now how do i run it?

It seems like a stupidly simple problem, I've installed the youtube-dlg program using pip on MacOS Sierra 10.12.3, got my dependencies in order through some struggling (wxpython3 instead of version 4), etc., and then now that I've gotten to a point where everything seems to be installed where it should be fit to run, I can't seem to figure out how. Here's where I got to.
$ sudo -H pip install youtube-dlg
Requirement already satisfied: youtube-dlg in
/private/var/root/Library/Python/2.7/lib/python/site-packages
My question is, how do I simply run youtube-dlg? The app name and path are listed, and I'm naively stuck on where to go next. This may be a pathing issue I'm not aware of. I was hoping to run it once and find a way to keep it either pinned to the Dock or in Apps seeing as it is a GUI. Getting this to work on windows was easy enough, but unfortunately in the OS world I am master of none, user of many.

Apparently all I needed to do was python youtube-dlg
I am a dummy! For anyone else that might be having troubles with youtube-dlg, make sure you are on wxpython version 3. The current version is 4. Here is a working link for the one I found. https://wxpython.org/snapshots/wxPython3.0-osx-3.0.3.0.b20160914-cocoa-py2.7.dmg

PySide2 on windows

Does anyone know where I can find a pip-install for PySide2?
It's 2017 and I can't seem to find a pip install or site-package containing the binaries for PySide2. I prefer not to deal with downloading the source code and compiling it myself, as that usually ends up being a huge headache as it's never a smooth process. Also considering it's highly likely someone else has already done it. If I were to be honest here, if I attempted to compile it myself and errors popped up, I wouldn't really know where to begin solving them, nor do I want to spend time doing that.
I just find it hard to believe I can't find it anywhere online or even in PIP when a lot of applications in the VFX industry are switching to PySide2.
I hope someone can help me out.
Thanks

Same Problem...
So i tried to build it. But there are Problems building the WebKit.
Hence my windows binaries are actually without a webkit binding.

You can obtain it through PyPI:
pip install PySide2
or if it fails (most likely because your pip executable is bound to python 2) try:
pip3 install PySide2
or even better:
python -m pip install Pyside2
This assumes that python is bound to Python 3, that way you're really sure about the Python version used, see Why you should use python -m pip.

There are wheels available by Fredrik Averpil here built with Qt 5.6.
Claudius Hansch's answer provides a wheel using Qt 5.9.
In any case, don't forget to either
set the QT_QPA_PLATFORM_PLUGIN_PATH environment variable as described here
or
create a qt.conf file in the folder of your python.exe with the content
[Paths]
Prefix = /dir_to_site-packages/PySide2
Binaries = /dir_to_site-packages/PySide2

PySide2 is now available on pypi so a simple
pip install PySide2
should work on Windows, OSX, and linux!

I use Python 3.7 on windows 10 pro, 64bit.
Installing via pip failed for me.
I ended up downloading the wheel from qt directly
QT official download page
and install the downloaded wheel which worked fine.

pip.exe has stopped working

I know this question has been asked a few times before, but none of the answers I've read have managed to solve my problem.
When I try to run any of the following, I get an error saying "pip.exe has stopped working:
easy_install
pip
pip3
It was working for me previously (the last time I used it was probably a month ago), but not anymore. I'm using Python 3.4.4, I checked the PATH and it's configured correctly. Does anyone know what else might be causing the issue?

I had the same problem before and the solution is quite simple.
First try updating pip via command:
pip install --upgrade pip
If that doesn't work try uninstalling current version of python and reinstalling the newest version.
Note1: Do not just delete install files and files in your C drive ,uninstall everything packages, everything that might cause problems, especially delete old python packages and extensions they might not work with the newest python version and that might be the problem. You can see in python website which packages and extensions are supported.
Note2: Do not and I repeat DO NOT install .msi or .exe extensions they don't work anymore always use .whl (wheel) files. If you have one .msi or .exe uninstall them form your system completely; that also means that you have to uninstall them from command prompt.
Note3: Always check if the .whl is compatible with your Python version.
Note4: Also don't forget to save your projects before doing anything.
Hope that works :D
Happy Coding.