Python scripting 101!

Braces? Semicolons? Meh.

# Example
def main():
    print ("Hello World!") 

You guessed it!  '#' comments out the rest of line

# Example
def main(): # this is the main function
    print ("Hello World!") # this prints Hello World!

Unlike the command-line interpreter, you need to print to see it!

# Example
def main():
    a = 1
    b = 2
    a + b ## this will not be printed
    c = a + b
    print ( "The result is", c )
    print ( a,b,c )
    print ("Hello World!") 
    # undefine a variable in real time
    del c

Everything is object in python!

We'll cover this later... 

Can it run on its own? Sure it can.

#!/usr/local/bin/python3
def main():
    print ("Hello World!") 

if __name__ == "__main__":
    main()

## make sure you change the file to be executable in shell.
## % chmod +x hw.py