One of the main new features in IPython 2.0 is interactive widgets.
Some additional references:
ipython/examples at master · ipython/ipython, specifically ipython/examples/Interactive Widgets at master · ipython/ipython
Hear Fernando Perez talk about interact starting at PyCon2014: IPython in Depth. Accompanying repo: ipython/ipython-in-depth.
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# need to be running at least version 2 of IPython
import IPython
IPython.version_info
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from IPython.display import display, Image, HTML, clear_output
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from IPython.html import widgets
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# what's in widgets
dir(widgets)
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import math
def fac(x):
print math.factorial(x)
fac(10)
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# let's dispaly factorial of input x
widgets.interact(fac,x=(0,1000,1))
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# how to set starting value of a widget?
widgets.interact(fac,
x=widgets.IntSliderWidget(min=0,max=1000,step=1,value=10))
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from jinja2 import Template
import uuid
def square(r,g,b,a):
html_template = """
<style>
#{{div_id}} {
background-color: rgba({{r}},{{g}},{{b}},{{a}});
height:100px;
width:100px;
}
</style>
<div id="{{div_id}}"/>"""
div_id="i" + str(uuid.uuid4())
html_src = Template(html_template).render(r=r, g=g, b=b, a=a, div_id=div_id)
display(HTML(html_src))
square(255,0,255,1)
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widgets.interact(square,
r=widgets.IntSliderWidget(min=0,max=255,step=1,value=0),
g=widgets.IntSliderWidget(min=0,max=255,step=1,value=0),
b=widgets.IntSliderWidget(min=0,max=255,step=1,value=0),
a=widgets.FloatSliderWidget(min=0,max=1,value=1)
)
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#hsla
# https://en.wikipedia.org/wiki/HSL_and_HSV
import colorsys
def square_hsla(h,s,l,a):
html_template = """
<style>
#{{div_id}} {
background-color:hsla({{h}},{{s}}%,{{l}}%,{{a}});
height:100px;
width:100px;
}
</style>
<div id="{{div_id}}"/>"""
div_id="i" + str(uuid.uuid4())
html_src = Template(html_template).render(h=h, s=s, l=l, a=a, div_id=div_id)
(r,g,b) = colorsys.hls_to_rgb(float(h)/360.0,float(l)/100.0,float(s)/100.0)
print (int(r*255+0.5), int(g*255+0.5), int(b*255+0.5))
display(HTML(html_src))
square_hsla(120,100,50,0.3)
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widgets.interact(square_hsla,
h=widgets.FloatSliderWidget(min=0,max=360,value=120),
s=widgets.FloatSliderWidget(min=0,max=100,value=100),
l=widgets.FloatSliderWidget(min=0,max=100,value=50),
a=widgets.FloatSliderWidget(min=0,max=1,value=0.3)
)
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%%html
<svg height="100">
<circle cx="50" cy="50" r="40" stroke="black" stroke-width="3" fill="red" />
</svg>
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def circle(r=40):
cx = int(1.25*r)
cy = cx
height = 2*cx
html = """<svg height="{height}">
<circle cx="{cx}" cy="{cy}" r="{r}" stroke="black" stroke-width="3" fill="red" />
</svg>
""".format(height=height, cx=cx, cy=cy, r=r)
display(HTML(html))
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circle(r=200)
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widgets.interact(circle, r=(0,500,5))
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w = widgets.FloatSliderWidget()
w.min = 0
w.max = 200
w.value = 30
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w
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w.value = 10
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import time
for m in range(0,200,2):
w.value = m
time.sleep(0.1)
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w.keys
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w.close()
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m = widgets.interact(circle, r=(0,500,5))
m
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for r in range (0,500,5):
m.widget._children[0].value = r
time.sleep(0.1)
for r in range (500,0,-5):
m.widget._children[0].value = r
time.sleep(0.1)
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#http://stackoverflow.com/a/20304752/7782
def pigLatin(aString):
index = 0
stringLength = len(aString)
consonants = ''
# if aString starts with a vowel then just add 'way' to the end
if isVowel(aString[index]):
return aString + 'way'
else:
# the first letter is added to the list of consonants
consonants += aString[index]
index += 1
# if the next character of aString is a vowel, then from the index
# of the vowel onwards + any consonants + 'ay' is returned
while index < stringLength:
if isVowel(aString[index]):
return aString[index:stringLength] + consonants + 'ay'
else:
consonants += aString[index]
index += 1
return 'This word does contain any vowels.'
def isVowel(character):
vowels = 'aeiou'
return character in vowels
def echoPL(s):
print pigLatin(s)
widgets.interact(echoPL, s="hello")
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