#!/usr/bin/env python
# coding: utf-8

# # Exercises
# 
# This collection of exercises can be done in any order, or even skipped entirely; none of the rest of the tutorial depends on it. Choose the ones that are of interest to you. Sample solutions are provided for all of them.
# 
# ## We do not anticipate that you will have time to complete all of the exercises
# 
# That is why we provide solutions!

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get_ipython().run_line_magic('matplotlib', 'inline')
import matplotlib.pyplot as plt

import numpy as np

import ipywidgets as widgets
from ipywidgets import interact, interactive 


# ## interact/interactive only

# ### Reverse some text
# 
# Write a function that takes text as an input and reverses the text, and uses `interact` or `interactive` to generate the input field. 

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# %load solutions/interact-basic-list/reverse-text.py


# ### Make a plot
# 
# Pick a function of interest to you that depends on a couple of parameters and use `interact` to generate controls for the parameters. 
# 
# If you don't have a favorite function, try graphing $f(x) = \sin(k x + p)$ over the $0 < x < 4\pi$, with $0.5 \le k \le 2$ and $0 \le p < 2\pi$.
# 
# Use either the `interact` function or the `@interact` decorator.

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# %load solutions/interact-basic-list/plot-function.py


# ### A more extended example of interact
# 
# A notebook I used in a cosmology course is [here](https://github.com/mwcraig/jupyter-notebook-intro/blob/master/supernova-data.ipynb). It used interact to allow students to fit cosmological models to high redshift supernova data.

# ## interact/interactive and/or other widgets
# 
# Some of the exercises below might be possible only with interact and interactive.

# ### Choose two widgets and link their values
# 
# Choose any two widgets from the widget list, link their values using `widgets.jslink`, and display both widgets (the `display` function can take more than one argument).
# 
# Note: for all widgets except the section widgets below you should link the `value` of the widgets. For the selection widgets, link the `index` instead.
# 
# Selection widgets:
# 
# + `Dropdown`
# + `RadioButtons`
# + `Select`
# + `SelectionSlider`
# + `SelectionRangeSlider`
# + `ToggleButtons`
# + `SelectMultiple`

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# %load solutions/interact-basic-list/sample-linked-widgets.py


# ### Boxes
# 
# Create any three widgets, place them in a `VBox`, and display it.

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# %load solutions/interact-basic-list/widgets-in-a-box.py


# ## Blank canvas
# 
# The cell below is for you to try out antyhing you would like. Be creative!

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