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Lecture # 27 Python I. Python. “ 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. Jython is a “ dialect ” of Python Python is implemented in C
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Lecture # 27 Python I
Python • “Interpretive” language (vs. compiled) So is HTML, JavaScript. • Python supports file I/O. JavaScript doesn’t • Python is a seriousweb programming language used by Google, ILM, etc.
Jython • Jython is a “dialect” of Python • Python is implemented in C Jython is implemented in Java • We use JES JES = Jython Environment for Students
Downloading Jython • http://code.google.com/p/mediacomp-jes/ • http://code.google.com/p/mediacomp-jes/downloads/list
Using Jython • Select JES from “Programs” • Click on the black part of the UI after the command prompt >>>
Jython DEMO • print 5 + 9 • print “Hello” • x = 5 + 9 • print x • message = “Hello There” • print message
Jython DEMO • 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.
Jython DEMO Pictures • pickAFile()
Jython DEMO Pictures • pickAFile() • print pickAFile()
Jython DEMO Pictures • pickAFile() • print pickAFile() • file = pickAFile()
Jython DEMO Pictures • pickAFile() • print pickAFile() • file = pickAFile() • print file
Jython DEMO Pictures • pickAFile() • print pickAFile() • file = pickAFile() • print file • pict=makePicture(file) # interpret as picture
Jython DEMO Pictures • pickAFile() • print pickAFile() • file = pickAFile() • print file • pict=makePicture(file) # interpret as picture • show(pict) # display as picture
How could we do this all at once? show(makePicture(pickAFile()))
How could we do this all at once? show(makePicture(pickAFile())) Now lets save it as a Python Program: displayPict.py
How could we do this all at once? show(makePicture(pickAFile())) Now lets save it as a Python Program: displayPict.py And run it: open it and load it
How could we do this all at once? show(makePicture(pickAFile())) Now lets save it as a Python Program: displayPict.py And run it: open it and load it King of the “1-liners”
Jython DEMO Sound • 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
Jython Functions def myFunction(): colon
Jython Functions def myFunction(): colon parentheses
Jython Functions def myFunction(): colon parentheses function name
Jython Functions def myFunction(): colon parentheses function name “def” instead of “function()”
Jython Functions def myFunction(): colon parentheses function name “def” instead of “function()” The function must be called somewhere
Jython Functions def myFunction(): block of commands
Jython Functions def myFunction(): block of commands Note indentation!
Jython Functions: Indentation • Indentation is critical in Python • Indentation associates these commands with this function • Indentation separates commands from other functions
Jython Function: Example defpickAndShow(): file = pickAFile() myPict = makePicture(file) show(myPict) pickAndShow() # somewhere we have to call the function