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Week01

Computer Programming

  • We write computer programs to tell computers what to do.
  • Every application you use is a computer program.
  • We write programs using programming languages.
  • In this class, we will learn the Python Programming Language.

Computer Science

  • The field of computer science (what you study as a CS major) includes computer programing, but also:
    • Problem solving
    • Algorithms and computing theory
    • Information organization and processing
    • System design
    • Human Interfaces
    • Hardware systems (CPU, Disk Drives, Networks, etc.)

Syllabus

  • Review

Operating Systems

  • Computers are more useful when they run on an operating system.
  • Operating systems manage the underlying computer hardware and often provide a nice user interface
  • Examples:
    • Windows
    • Mac OS X
    • Linux (UNIX)
  • There are many other operating systems, but these are the most popular.  Others include:
    • iOS (iPhone OS), based on Mac OS X
    • Android OS, based on Linux
  • We will be learning the Linux operating system, as it is used to power most internet services and applications.

Working in Linux

  • You may not be familiar with Linux, but it is pretty easy to learn.
  • Just like Windows and Mac OS X, Linux provides a graphical user interface with windows and menus.
  • Linux has standard applications like a web browser (Firefox or Chrome) and word processing (OpenOffice).
  • As programmers, you need to learn how to use the Terminal and the UNIX command line interface.
  • The command line allows you to type commands directly.
  • From the command line you can look examine directories, edit files, and run programs.
    • You can also do much more.
  • Getting familiar with the command line will make you a better programmer.

CS Accounts

  • You will do all of your work for CS 110 using your CS account.
  • This account allows you to login into all the CS machines.
    • The machines are located in HR 235, HR 530, and HR 536.
  • You can also login remote though stargate.cs.usfca.edu using ssh (more later).

Email Communication, Discussion Group, and Portfolios

  • First, as a computer scientist, email communication is extremely important.
  • We need to make sure that you can send email to the instructor and TAs and that you can receive all course related email.
  • Email accounts.  Currently you probably have the following email accounts:
    • Your personal account (Gmail, Yahoo, Hotmail, etc.)
    • Your Donsmail account
    • Your CS account
  • Wow, that's a lot of email accounts.
  • You need to understand what each account is needed for and how to set them up so that your email goes to one place.
  • You should pick one account (likely, your personal account or your new Gmail account), call this your MAIN account.
  • You should have mail forwarded from your other accounts to your MAIN account.
  • You need to email me your MAIN account, so that I know what it is.

Discussion Group

  • We will use a Google Group for course announcements and discussion.
  • You need to read your email regularly for updates and help.
  • You can ask questions to the group and the instructor or TA will respond.

Portfolios

  • For this class you will maintain a CS 110 portfolio.
  • We will be using Google Sites for you portfolio.
  • You need to send me a link to your portfolio.
  • All lab work and projects will be submitted to your portfolio.

Running Python Interactively

  • We can use the Python programming language in two ways:
  1. Interactive mode
  2. Script mode (program mode)
  • In interactive mode, you can type python code directly into the interpreter and get results:

$ python
Python 2.7.3 (default, Apr 24 2012, 00:00:54) 
[GCC 4.7.0 20120414 (prerelease)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> 1 + 2
3
>>> print 'Hello World!'
Hello World!
>>> for i in range(10):
...     print i
... 
0
1
2
3
4
5
6
7
8
9
>>> 

Creating Python Program Files

  • As an alternative to using Python interactively, you can write python code and put it into a file.
  • In order to write programs this way, we need to use an editor.
    • A simple editor found on Linux is call Gedit.
  • You can start gedit from the command line or from the Applications menu.
  • You can also use the UNIX cat command to create simple files:
$ cat > hello.py
print 'Hello World'
$ python hello.py 
Hello World

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