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1. PYTHON ASSIGNMENT HELP
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2. Python Tutorial Assignments
• interactive "shell"
• basic types: numbers, strings
• container types: lists, dictionaries, tuples
• variables
• control structures
• functions & procedures
• classes & instances
• modules & packages
• exceptions
• files & standard library
• what's new in Python 2.0 and beyond

3. Python Assignment Overview
• Programs are composed of modules
• Modules contain statements
• Statements contain expressions
• Expressions create and process objects

4. Python Assignment Interpreter
• >>> 3 + 7
• 10
• >>> 3 < 15
• True
• >>> 'print me'
• 'print me'
• >>> print 'print me'
• print me
• >>>
• Python is an interpreted language
• The interpreter provides an interactive
environment to play with the language
• Results of expressions are printed on the
screen

5. Numbers: Integers
• Integer – the equivalent of a C long
• Long Integer – an unbounded integer value.

6. Numbers: Floating Point
>>> 1.23232
1.2323200000000001
>>> print 1.23232
1.23232
>>> 1.3E7
13000000.0
>>> int(2.0)
2
>>> float(2)
2.0
int(x) converts x to an integer
float(x) converts x to a floating point
The interpreter shows
a lot of digits

7. Running Interactively on UNIX
On Unix…
% python
>>> 3+3
6
• Python prompts with ‘>>>’.
• To exit Python (not Idle):
– In Unix, type CONTROL-D
– In Windows, type CONTROL-Z + <Enter>
– Evaluate exit()

8. Editing Python in Emacs
• Emacs python-mode has good support for editing Python, enabled enabled by default for
.py files
• Features: completion, symbol help, eldoc, and inferior interpreter shell, etc.

9. Basic Datatypes
• Integers (default for numbers)
z = 5 / 2 # Answer 2, integer division
• Floats
x = 3.456
• Strings
– Can use “” or ‘’ to specify with “abc” == ‘abc’
– Unmatched can occur within the string: “matt’s”
– Use triple double-quotes for multi-line strings or
strings than contain both ‘ and “ inside of them:
“““a‘b“c”””

10. Python Assignment
• Binding a variable in Python means setting a name to hold
a reference to some object
– Assignment creates references, not copies
• Names in Python do not have an intrinsic type, objects
have types
– Python determines the type of the reference automatically
based on what data is assigned to it
• You create a name the first time it appears on the left side
of an assignment expression:
x = 3
• A reference is deleted via garbage collection after any
names bound to it have passed out of scope
• Python uses reference semantics (more later)

11. Python Features
• no compiling or linking
• rapid development cycle
• no type declarations
• simpler, shorter, more flexible
• automatic memory management
• garbage collection
• high-level data types and operations
• fast development
• object-oriented programming
• code structuring and reuse, C++
• embedding and extending in C
• mixed language systems
• classes, modules, exceptions
• "programming-in-the-large" support
• dynamic loading of C modules
• simplified extensions, smaller binaries
• dynamic reloading of C modules
• programs can be modified without stopping

12. Python structure
• modules: Python source files or C extensions
– import, top-level via from, reload
• statements
– control flow
– create objects
– indentation matters – instead of {}
• objects
– everything is an object
– automatically reclaimed when no longer needed

13. Language comparison
Tcl Perl Python JavaScrip
t
Visual
Basic
Speed development     
regexp   
breadth extensible   
embeddable  
easy GUI   (Tk) 
net/web     
enterpris
e
cross-platform    
I18N    
thread-safe   
database access     