Установка библиотеки ujson для Python3.7 на Ubuntu 18.04?

При попытке
pip3 install ujson:
Collecting json
Could not find a version that satisfies the requirement json (from versions: )
No matching distribution found for json
При попытке:
pip install ujson
Command "/home/user/projectname/venv/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-install-p_wjk8ks/ujson/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-record-5bqhlrz8/install-record.txt --single-version-externally-managed --compile --install-headers /home/user/projectname/venv/include/site/python3.7/ujson" failed with error code 1 in /tmp/pip-install-p_wjk8ks/ujson/
Что-то другое

Так стоит дев пакет то или нет?
Если нет, то попробуй поставить, удали папку с окружением и создай заново

Collecting ujson
Using cached https://files.pythonhosted.org/packages/16/c4/79f3...
Installing collected packages: ujson
Running setup.py install for ujson: started
Running setup.py install for ujson: finished with status 'error'
Complete output from command /home/user/projectname/venv/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pycharm-packaging/ujson/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-record-x3gilh7h/install-record.txt --single-version-externally-managed --compile --install-headers /home/user/projectname/venv/include/site/python3.7/ujson:
Warning: 'classifiers' should be a list, got type 'filter'
running install
running build
running build_ext
building 'ujson' extension
creating build
creating build/temp.linux-x86_64-3.7
creating build/temp.linux-x86_64-3.7/python
creating build/temp.linux-x86_64-3.7/lib
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -g -fdebug-prefix-map=/build/python3.7-1t2gIN/python3.7-3.7.0~b3=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I./python -I./lib -I/home/user/projectname/venv/include -I/usr/include/python3.7m -c ./python/ujson.c -o build/temp.linux-x86_64-3.7/./python/ujson.o -D_GNU_SOURCE
In file included from ./python/ujson.c:39:0:
./python/py_defines.h:39:10: fatal error: Python.h: No such file or directory
#include
^~~~~~~~~~
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1

----------------------------------------

Command "/home/user/projectname/venv/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pycharm-packaging/ujson/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-record-x3gilh7h/install-record.txt --single-version-externally-managed --compile --install-headers /home/user/projectname/venv/include/site/python3.7/ujson" failed with error code 1 in /tmp/pycharm-packaging/ujson/

(2715) ➜  python pyenv virtualenv 3.7.0 370
Looking in links: /var/folders/w0/m_4f_m9d00z6b03wrzw6rd_c0000gn/T/tmphxkherah
Requirement already satisfied: setuptools in /Users/vadim/.pyenv/versions/3.7.0/envs/370/lib/python3.7/site-packages (39.0.1)
Requirement already satisfied: pip in /Users/vadim/.pyenv/versions/3.7.0/envs/370/lib/python3.7/site-packages (10.0.1)
(2715) ➜  python pyenv activate 370
pyenv-virtualenv: prompt changing will be removed from future release. configure `export PYENV_VIRTUALENV_DISABLE_PROMPT=1' to simulate the behavior.
(370) ➜  python pip install ujson
Collecting ujson
  Downloading https://files.pythonhosted.org/packages/16/c4/79f3409bc710559015464e5f49b9879430d8f87498ecdc335899732e5377/ujson-1.35.tar.gz (192kB)
    100% |████████████████████████████████| 194kB 1.8MB/s
Installing collected packages: ujson
  Running setup.py install for ujson ... done
Successfully installed ujson-1.35

Это я к тому что ставится ujson на 3.7.0 - не получается так - пользуйся pyenv

ValdemarTXT с venv - все норм:

$ python3.7 -m venv /tmp/py37
$ /tmp/py37/bin/pip install ujson
Collecting ujson
  Downloading https://files.pythonhosted.org/packages/16/c4/79f3409bc710559015464e5f49b9879430d8f87498ecdc335899732e5377/ujson-1.35.tar.gz (192kB)
    100% |████████████████████████████████| 194kB 7.4MB/s 
Installing collected packages: ujson
  Running setup.py install for ujson ... done
Successfully installed ujson-1.35
$ /tmp/py37/bin/python3.7 -c "import ujson; print(ujson.__version__)"
1.35

Мне кажется было так - не было дев пакетов - и в старом окружении не ставилось
Пакеты добавил - но окружение не снес - опять не ставилось
А в новосозданном окружении (уже с дев пакетами) - все поставилось