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Python.h not found even after I used sudo install

I've been studying darkflow from the following link;
https://github.com/thtrieu/darkflow
on Ubuntu 20.04
I thought there was a problem in my flow file, so I tried to rebuild the build file by the following code
dyi#D-FIP7VAE:~/Tiny-YOLO-voc-traffic-sign-detection$ python3.7 setup.py build_ext --inplace<br/>
and this is what i got.
setup.py:6: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
import imp
running build_ext
building 'darkflow.cython_utils.nms' extension
x86_64-linux-gnu-gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O2 -Wall -g -fdebug-prefix-map=/build/python3.7-ZE4Yn0/python3.7-3.7.10=. -fstack-protector-strong -Wformat -Werror=format-security -g -fdebug-prefix-map=/build/python3.7-ZE4Yn0/python3.7-3.7.10=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I/home/dyi/.local/lib/python3.7/site-packages/numpy/core/include -I/usr/include/python3.7m -c darkflow/cython_utils/nms.c -o build/temp.linux-x86_64-3.7/darkflow/cython_utils/nms.o
darkflow/cython_utils/nms.c:29:10: fatal error: Python.h: No such file or directory
29 | #include "Python.h"
| ^~~~~~~~~~
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
so I tried this
sudo apt-get install python3-dev
But this didn't work, and I get the same error over and over.
Can anybody find the reason why..?

You can try :
sudo apt install libpython3.7-dev

Installing Kivy 1.10.1 on Raspbian Buster

I found errors when installing kivy 1.10.1.dev0 on my new Raspberry Pi 4.
The source of error comes from the instruction:
sudo pip3 install git+https://github.com/kivy/kivy.git#master
after following the guide https://kivy.readthedocs.io/en/master/installation/installation-rpi.html#.
It gives the error:
building 'kivy.lib.vidcore_lite.egl' extension
creating build/temp.linux-armv7l-3.7/tmp/pip-req-build-bsrs6yn7/kivy/lib/vidcore_lite
arm-linux-gnueabihf-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I/tmp/pip-req-build-bsrs6yn7/kivy/include -I/opt/vc/include -I/opt/vc/include/interface/vcos/pthreads -I/opt/vc/include/interface/vmcs_host/linux -I/usr/include/python3.7m -c /tmp/pip-req-build-bsrs6yn7/kivy/lib/vidcore_lite/egl.c -o build/temp.linux-armv7l-3.7/tmp/pip-req-build-bsrs6yn7/kivy/lib/vidcore_lite/egl.o
/tmp/pip-req-build-bsrs6yn7/kivy/lib/vidcore_lite/egl.c:1:2: error: #error Do not use this file, it is the result of a failed Cython compilation.
#error Do not use this file, it is the result of a failed Cython compilation.
^~~~~
error: command 'arm-linux-gnueabihf-gcc' failed with exit status 1
----------------------------------------
Failed building wheel for Kivy
Running setup.py clean for Kivy
Failed to build Kivy
Installing collected packages: Kivy

Building pywt on ubuntu

I have problems building pywt from source on Ubuntu.
When I run python setup.py build, I get the following error:
running build
running build_py
running build_ext
Cython is not installed. Using compiled file: src/_pywt.pyx
building 'pywt._pywt' extension
creating build/temp.linux-x86_64-2.7
creating build/temp.linux-x86_64-2.7/src
gcc -pthread -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -DPY_EXTENSION -Isrc -I/usr/local/include/python2.7 -c src/_pywt.c -o build/temp.linux-x86_64-2.7/src/_pywt.o
gcc: error: src/_pywt.c: No such file or directory
gcc: fatal error: no input files
compilation terminated.
error: command 'gcc' failed with exit status 4
When I run cython --version I get the following output:
Cython version 0.21.1

pywt can be installed as an Ubuntu package using apt-get:
sudo apt-get install python-pywt

Failed to build the bsdiff module

Good afternoon all,
I am having trouble using the bsdiff module with Python. While I can use shell scripts I would prefer to have a cross-platform solution.
I have downloaded bsdiff4-1.1.4 and attempt to run setup.py as follows:
Files list:
bsdiff4 build CHANGELOG.txt do.sh examples Makefile README.rst setup.py
I run:
python3 setup.py build
And I get this error:
/usr/lib/python3.4/distutils/dist.py:260: UserWarning: Unknown distribution option: 'entry_points'
warnings.warn(msg)
running build
running build_py
running build_ext
building 'bsdiff4.core' extension
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -g -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -fPIC -I/usr/include/python3.4m -c bsdiff4/core.c -o build/temp.linux-x86_64-3.4/bsdiff4/core.o
bsdiff4/core.c:8:20: fatal error: Python.h: No such file or directory
#include <Python.h>
^
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
I want to be able to use python to apply patches to binary files.
Any help appreciated.
José

You need to install apt-get install python3-dev.
ubuntu python3-dev
header files and a static library for Python
If it is your system python you will need sudo

Installing rdiff on docker containers

I am trying to make a backup solution off docker containers using rdiff. I have python install and the python-dev packages but when I run the install command:
python ./setup.py install
I get the following error
running install
running build
running build_py
running build_ext
building 'rdiff_backup._librsync' extension
gcc -pthread -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -I/usr/local/include/python2.7 -c _librsyncmodule.c -o build/temp.linux-x86_64-2.7/_librsyncmodule.o
_librsyncmodule.c:25:22: fatal error: librsync.h: No such file or directory
compilation terminated.
error: command 'gcc' failed with exit status 1

Your container needs the librsync-dev package.