Point html links to github pages instead of htmlpreview

Author: jerry-git

README.md

@@ -27,24 +27,24 @@ See [contributing](https://github.com/jerry-git/learn-python3/blob/master/CONTRI
 
 
 ## Beginner
-1. [Strings](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/beginner/html/strings.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/strings.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/strings_exercise.ipynb)
-1. [Numbers](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/beginner/html/numbers.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/numbers.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/numbers_exercise.ipynb)
-1. [Conditionals](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/beginner/html/conditionals.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/conditionals.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/conditionals_exercise.ipynb)
-1. [Lists](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/beginner/html/lists.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/lists.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/lists_exercise.ipynb)
-1. [Dictionaries](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/beginner/html/dictionaries.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/dictionaries.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/dictionaries_exercise.ipynb)
-1. [For loops](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/beginner/html/for_loops.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/for_loops.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/for_loops_exercise.ipynb)
-1. [Functions](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/beginner/html/functions.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/functions.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/functions_exercise.ipynb)
-1. [Testing with pytest - part 1](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/beginner/html/testing1.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/testing1.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/testing1_exercise.ipynb)
+1. [Strings](https://jerry-git.github.io/learn-python3/notebooks/beginner/html/strings.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/strings.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/strings_exercise.ipynb)
+1. [Numbers](https://jerry-git.github.io/learn-python3/notebooks/beginner/html/numbers.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/numbers.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/numbers_exercise.ipynb)
+1. [Conditionals](https://jerry-git.github.io/learn-python3/notebooks/beginner/html/conditionals.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/conditionals.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/conditionals_exercise.ipynb)
+1. [Lists](https://jerry-git.github.io/learn-python3/notebooks/beginner/html/lists.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/lists.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/lists_exercise.ipynb)
+1. [Dictionaries](https://jerry-git.github.io/learn-python3/notebooks/beginner/html/dictionaries.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/dictionaries.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/dictionaries_exercise.ipynb)
+1. [For loops](https://jerry-git.github.io/learn-python3/notebooks/beginner/html/for_loops.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/for_loops.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/for_loops_exercise.ipynb)
+1. [Functions](https://jerry-git.github.io/learn-python3/notebooks/beginner/html/functions.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/functions.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/functions_exercise.ipynb)
+1. [Testing with pytest - part 1](https://jerry-git.github.io/learn-python3/notebooks/beginner/html/testing1.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/testing1.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/testing1_exercise.ipynb)
 1. Recap exercise 1 [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/recap1_exercise.ipynb)
-1. [File I\O](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/beginner/html/file_io.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/file_io.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/file_io_exercise.ipynb)
-1. [Classes](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/beginner/html/classes.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/classes.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/classes_exercise.ipynb)
-1. [Exceptions](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/beginner/html/exceptions.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exceptions.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/exceptions_exercise.ipynb)
-1. [Modules and packages](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/beginner/html/modules_and_packages.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/modules_and_packages.ipynb)
-1. [Debugging](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/beginner/html/debugging.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/debugging.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/debugging_exercise.ipynb)
-1. [Goodies of the Standard Library - part 1](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/beginner/html/std_lib.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/std_lib.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/std_lib1_exercise.ipynb)
-1. [Testing with pytest - part 2](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/beginner/html/testing2.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/testing2.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/testing2_exercise.ipynb)
-1. [Virtual environment](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/beginner/html/venv.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/venv.ipynb)
-1. [Project structure](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/beginner/html/project_structure.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/project_structure.ipynb)
+1. [File I\O](https://jerry-git.github.io/learn-python3/notebooks/beginner/html/file_io.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/file_io.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/file_io_exercise.ipynb)
+1. [Classes](https://jerry-git.github.io/learn-python3/notebooks/beginner/html/classes.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/classes.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/classes_exercise.ipynb)
+1. [Exceptions](https://jerry-git.github.io/learn-python3/notebooks/beginner/html/exceptions.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exceptions.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/exceptions_exercise.ipynb)
+1. [Modules and packages](https://jerry-git.github.io/learn-python3/notebooks/beginner/html/modules_and_packages.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/modules_and_packages.ipynb)
+1. [Debugging](https://jerry-git.github.io/learn-python3/notebooks/beginner/html/debugging.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/debugging.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/debugging_exercise.ipynb)
+1. [Goodies of the Standard Library - part 1](https://jerry-git.github.io/learn-python3/notebooks/beginner/html/std_lib.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/std_lib.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/std_lib1_exercise.ipynb)
+1. [Testing with pytest - part 2](https://jerry-git.github.io/learn-python3/notebooks/beginner/html/testing2.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/testing2.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/testing2_exercise.ipynb)
+1. [Virtual environment](https://jerry-git.github.io/learn-python3/notebooks/beginner/html/venv.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/venv.ipynb)
+1. [Project structure](https://jerry-git.github.io/learn-python3/notebooks/beginner/html/project_structure.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/project_structure.ipynb)
 1. Recap exercise 2 [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/beginner/exercises/recap2_exercise.ipynb)
 
 
@@ -53,18 +53,18 @@ See [contributing](https://github.com/jerry-git/learn-python3/blob/master/CONTRI
 #### Idiomatic Python
 Python is a powerful language which contains many features not presented in most other programming languages. Idiomatic section will cover some of these Pythonic features in detail. These materials are especially useful for people with background in other programming languages.
 
-1. [Idiomatic loops](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/intermediate/html/idiomatic_loops.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/intermediate/idiomatic_loops.ipynb)
-1. [Idiomatic dictionaries](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/intermediate/html/idiomatic_dicts.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/intermediate/idiomatic_dicts.ipynb)
-1. [Idiomatic Python - miscellaneous part 1](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/intermediate/html/idiomatic_misc1.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/intermediate/idiomatic_misc1.ipynb)
-1. [Idiomatic Python - miscellaneous part 2](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/intermediate/html/idiomatic_misc2.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/intermediate/idiomatic_misc2.ipynb)
+1. [Idiomatic loops](https://jerry-git.github.io/learn-python3/notebooks/intermediate/html/idiomatic_loops.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/intermediate/idiomatic_loops.ipynb)
+1. [Idiomatic dictionaries](https://jerry-git.github.io/learn-python3/notebooks/intermediate/html/idiomatic_dicts.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/intermediate/idiomatic_dicts.ipynb)
+1. [Idiomatic Python - miscellaneous part 1](https://jerry-git.github.io/learn-python3/notebooks/intermediate/html/idiomatic_misc1.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/intermediate/idiomatic_misc1.ipynb)
+1. [Idiomatic Python - miscellaneous part 2](https://jerry-git.github.io/learn-python3/notebooks/intermediate/html/idiomatic_misc2.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/intermediate/idiomatic_misc2.ipynb)
 1. Idiomatic Python exercise [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/intermediate/exercises/idiomatic_python_exercise.ipynb)
 
 #### Step up your `pytest` game
-1. [Efficient use of fixtures](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/intermediate/html/pytest_fixtures.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/intermediate/pytest_fixtures.ipynb)
+1. [Efficient use of fixtures](https://jerry-git.github.io/learn-python3/notebooks/intermediate/html/pytest_fixtures.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/intermediate/pytest_fixtures.ipynb)
 1. Other tips and tricks
 
 #### General topics
-1. [Goodies of the Standard Library - part 2](http://htmlpreview.github.com/?https://github.com/jerry-git/learn-python3/blob/master/notebooks/intermediate/html/std_lib2.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/intermediate/std_lib2.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/intermediate/exercises/std_lib2_exercise.ipynb)
+1. [Goodies of the Standard Library - part 2](https://jerry-git.github.io/learn-python3/notebooks/intermediate/html/std_lib2.html) [[notebook]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/intermediate/std_lib2.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/jerry-git/learn-python3/blob/master/notebooks/intermediate/exercises/std_lib2_exercise.ipynb)
 
 #### Backlog
 * Sets