“Interpretive” language (vs compiled)

“Interpretive” language (vs. compiled)

• “Interpretive” language (vs. compiled)

• So is HTML, JavaScript.

• Python supports file I/O. JavaScript doesn’t

• Python is a serious web programming language used by Google, ILM, etc.

Jython is a “dialect” of Python

• Jython is a “dialect” of Python

• Python is implemented in C

• Jython is implemented in Java

• We use JES

• JES = Jython Environment for Students

http://code.google.com/p/mediacomp-jes/

• http://code.google.com/p/mediacomp-jes/

• http://code.google.com/p/mediacomp-jes/downloads/list

Select JES from “Programs”

• Select JES from “Programs”

• Click on the black part of the UI

• after the command prompt >>>

print 5 + 9

• print 5 + 9

• print “Hello”

• x = 5 + 9

• print x

• message = “Hello There”

• print message

print 5 + 9

• print 5 + 9

• print “Hello”

• x = 5 + 9

• print x

• message = “Hello There”

• print message

• Note: Python is case sensitive.

• “Print” and “Message” won’t work.

pickAFile()

• pickAFile()

pickAFile()

• pickAFile()

• print pickAFile()

pickAFile()

• pickAFile()

• print pickAFile()

• file = pickAFile()

pickAFile()

• pickAFile()

• print pickAFile()

• file = pickAFile()

• print file

pickAFile()

• pickAFile()

• print pickAFile()

• file = pickAFile()

• print file

• pict=makePicture(file) # interpret as picture

pickAFile()

• pickAFile()

• print pickAFile()

• file = pickAFile()

• print file

• pict=makePicture(file) # interpret as picture

• show(pict) # display as picture

show(makePicture(pickAFile()))

• show(makePicture(pickAFile()))

show(makePicture(pickAFile()))

• show(makePicture(pickAFile()))

• Now lets save it as a Python Program:

• displayPict.py

show(makePicture(pickAFile()))

• show(makePicture(pickAFile()))

• Now lets save it as a Python Program:

• displayPict.py

• And run it:

• open it

• and load it

show(makePicture(pickAFile()))

• show(makePicture(pickAFile()))

• Now lets save it as a Python Program:

• displayPict.py

• And run it:

• open it

• and load it

file = pickAFile()

• file = pickAFile()

• print file

• sound=makeSound(file) # interpret as sound

• play(sound) # lets listen to it

• All together: play(makeSound(pickAFile()))

• Save as a Python program and run it

def myFunction(): colon

• def myFunction(): colon

def myFunction(): colon

• def myFunction(): colon

• parentheses

def myFunction(): colon

• def myFunction(): colon

• parentheses

• function name

def myFunction(): colon

• def myFunction(): colon

• parentheses

• function name

• “def” instead of “function()”

def myFunction(): colon

• def myFunction(): colon

• parentheses

• function name

• “def” instead of “function()”

• The function must be called somewhere

def myFunction():

• def myFunction():

• block of commands

def myFunction():

• def myFunction():

• block of commands

• Note indentation!

Indentation is critical in Python

• Indentation is critical in Python

• Indentation associates these commands with this function

• Indentation separates commands from other functions

def pickAndShow():

• def pickAndShow():

• file = pickAFile()

• myPict = makePicture(file)

• show(myPict)

• pickAndShow() # somewhere we have to

• call the function