Python Assignment & Homework Help

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PYTHON PROGRAMMING LANGUAGE

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Introduction

• Python is a general-purpose interpreted,
  interactive, object-oriented and high-level
  programming language. Python was created by Guido
  van Rossum in the late eighties and early
  nineties. Like Perl, Python source code is also
  now available under the GNU General Public
  License (GPL).

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Installing Python

• First download Python-2.4.1.exe by following this
  link. If you are a dialup user, keep in mind that
  the file is around 10MB
• Run the file you just downloaded, and follow the
  prompts.
• OK! Hopefully now everything is good! Now, to
  test if that just worked, type this in your DOS
  window
• python V

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Math in python

• Addition
• gtgtgt11
• 2
• gtgtgt2080
• 100
• Subtraction
• gtgtgt6-4
• 2

• Multiplication
• gtgtgt52
• 10
• gtgtgt32
• 9
• Division
• gtgtgt21/7
• 3

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Program in a file, and variables

• Variables
• Variables store a value, that can be looked at or
  changed at a later time.
• Variable demonstrated
• print this program is demo of variables
• Print the value of v is now , v
• Vv1

• Writing program in python to a file is very easy.
  Python programs are simply text documents. You
  can open them up in notepad.
• A simple program
• print Mary has a little lamb

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loops

• The while loop
• a0
• While alt10
• aa1
• Print a

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For Loop

• Basically, the for loop does something foe every
  value in a list. The way it is set out is a
  little confusing, but otherwise is very basic.
• cheerleading program
• Word raw_input( who do you go for? )
• For letter in word
• Call Gimme a letter !
• Print call
• Print letter !
• Print what does that spell?
• Print word !

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Conditional Statements

• If conditions to b e met
• do this
• and this
• but this happens regardless
• because it is not indented
• Example1
• Y 1
• If y 1
• Print y still equals 1, I was just checking

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Functions

• Python has lot of pre-made functions, that you
  can use right now, simply by calling them.
  Calling is a function involves you giving a
  function input, and it will return a value as
  output.
• Here is a general form that calling a function
  takes.
• function_name(parameters)

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File I/O

• To open a text file you use, well, the open()
  function. Seems sensible. You pass certain
  parameters to open() to tell it in which way the
  file should be opened r for read only and w
  for writing only, -a for appending and r
  both reading and writing.
• Ex-
• openfile open(pathtofile, r)
• Openfile.read()

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