Programming intro variables constants - arithmetic and assignment operators

Agenda of LO CS.1.08 W3
1- Warm up about programming 10 min
2- ppt teacher demonstrate about Python 15m
3- Video about Python 5min
4- Practical work Students divided in pairs and use
Anaconda : Spyder or on line Python platform to
create very simple program using python
-3.8.1 7
- Questions and answers as pretest about Python 5 m
8-Refelection 5 min
9- Home work 5 min
Python
Eng. & Educator Osama
Ghandour

LO CS.1.08 W3 - Gain Interpret
a work of design, implement, test
and debug programs that use
different data types, variables and
constants. • Use strategies before,
during and post (Arithmetic and
Assignment)..
Lesson plan
Python
Ghandour

Warm Up Why Python
Listen to this video
Offline
On line
Python
Ghandour

Essential Question
1- What is the different
between the data types?
2- What is the different
between the Constants
and Variables?
Python
Ghandour

Essential Question
3- How can test a program
and debug its errors?
4- Mention the Arithmetic
and Assignment Operators,
and give some examples.
Python
Ghandour

Getting Started With Python
Programming
•Tutorial: creating computer programs
•Variables and constants
•Input and output
•Operators
•Common programming errors
•Formatted output

James Tam
Tips For Success: Programming Sections
• (The previous 4 tips are still applicable but there’s some tips specific
to programming):
– Take extensive notes: everything in class not just what the instructor “writes
down” but also what he/she “says in class”.
• Some students may find when studying the lecture slides for the exam that they
cannot understand concepts.
• The extra “filling of the blanks” occurs during lecture so you need to annotate the
slides with your own notes
– After lectures have covered a particular concept/example
• If you have time try writing the program on your own (without looking at the online
examples or notes) in order to create a program that fulfills the same task as the
example program
• (It’s one thing to see the solution to a problem explained, your depth of
understanding will be deeper if you have to re-create it from scratch yourself).
• JT’s note: you may find this unnecessary for the simple examples in this section but it
will be beneficial to do this when more complex concepts are covered (e.g. nested
loops onwards)

James Tam
Python
• This is the name of the programming language that will be
used to illustrate different programming concepts this
semester:
–My examples will be written in Python
–Your assignments will be written in Python
• Some advantages (from Python dot org)
–Free
–Powerful
–Widely used (Google, NASA, Yahoo, Electronic Arts, some Linux
operating system scripts etc.)
• Named after a British comedy “Monty Python’s Flying Circus”
–Official website (Python the programming language, not the Monty
Python comedy troop): http://www.python.org
–An overview of the web site:
https://www.python.org/about/gettingstarted/

James Tam
Python History
• Developed in the early 1990s by Guido van
Rossum.
• Python was designed with a tradeoff in mind (from
“Python for everyone” (Horstman and Necaise):
– Pro: Python programmers could quickly write programs
(and not be burdened with an overly difficult language)
– Con: Python programs weren’t optimized to run as
efficiently as programs written in some other languages.
From:
http://www.python.org/~guido/

James Tam
Working From Home
• Remotely login to the Computer Science network
• Advantage:
– The interface will be the same in the CPSC lab vs. working at home.
– If you login to the correct machine then your program is guaranteed to work in the
lab (pick a “Linux” based machine).
– No need to transfer files because you are directly editing them on your CPSC
account when you are at home
• Drawback:
– There is a fair learning curve at first
– Example: Connect using a remote login program such as SSH or Putty
• Info:
http://pages.cpsc.ucalgary.ca/~tamj/resources/new_CPSC_student/
working_at_home.html
• Downloads:
– Working from home, use Putty: http://www.ucalgary.ca/cpsc/files/cpsc/putty.zip
– Transferring files to/from home, use Filezilla: https://filezilla-project.org/
– (The remote login software SSH comes with MacOS so no download is needed).
• Sometime later in the semester, in tutorial, the Teaching Assistants
will show you how to use these programs.

James Tam
Working From Home (Installing Python)
• Alternative (OK for 217/231 but not recommended for
219/233): Getting Python (get version 3.X and not version 2.X)
– http://www.python.org/download/

James Tam
The First Python Program
• Program name: small.py
print ("hello",end="")
Filename: 1small.py

James Tam
Creating/Running Programs: One Operating System
• The process is similar on other platforms/OS’s (the TA’s will
show you how to do it on the lab computers (Linux) during
tutorials).
Step 1: Writing your program
–You need a text editor (e.g., WordPad, Notepad, Notepad++) to enter
the program.
–It can be done using any editor that you want, but don’t use a word
processor (e.g., MS-Word) and remember to save it as a text file ending
with the suffix dot-py “.py”

James Tam
Creating/Running Programs: One Operating System (2)
Step 2: Translating and running your program
– You need to open a command line to translate/run your Python
program.
– The name of the Python translator is “Python”
– To translate/run your program type “python filename.py” at the
command line.
• The first example program would be executed by typing “python small.py”
• For a program whose filename is called “output1.py” you would type “python
output1.py”. Running
/translating
the program
Output of program
(result of running the
program)

James Tam
Important Reminders
• Make sure you type the whole file name (including the part
after the period) when you translate/run your program.
–E.g., “python small.py”
• Unless you are very familiar with your operating system when
you translate/run a program you should first navigate to the
directory/folder where your Python program resides.
–JT: the ‘cd’ command changes your directory (Windows and UNIX
although something different is needed when changing Windows drives)
–Suppose my program was under:
C:231 (Windows)
OR
/home/231 (UNIX)
–To reach this location you could (shortcuts excluded for now) then type:
c:231 (Windows)
OR
cd /home/231 (UNIX)

James Tam
Variables
• Set aside a location in memory.
• Used to store information (temporary).
– This location can store one ‘piece’ of information.
• Putting another piece of information at an existing location overwrites previous
information.
– At most the information will be accessible as long as the program runs i.e., it’s
temporary
• Some types of information which can be stored in variables include:
integer (whole), floating point (fractional), strings (essentially any
characters you can type and more)
Format (creating):
<name of variable> = <Information to be stored in the variable>
Examples (creating):
– Integer (e.g., num1 = 10)
– Floating point (e.g., num2 = 10.0)
– Strings: alpha, numeric, other characters enclosed in quotes.
• e.g., name = "james"
• To be safe get in the habit of using double (and not single) quotes
Image curtesy of James Tam
slide 16

James Tam
The Assignment Operator: =
• The assignment operator '=' used in writing computer
programs does not have the same meaning as mathematics.
–Don’t mix them up!
• Example:
y = 3 (what is stored in ‘x’ at this point)
x = y (what is stored in ‘x’,’y’ at this point)
y = 6 (what is stored in ‘x’,’y’ at this point)
• What is the end result? How was this derived (what are the
intermediate results from each assignment/line above)?
• See the program ‘2assignment.py’

James Tam
Variable Naming Conventions
• Python requirements:
– Rules built into the Python language for writing a program.
– Somewhat analogous to the grammar of a ‘human’ language.
– If the rules are violated then the typical outcome is the program
cannot be translated (nor run).
• A language such as Python may allow for a partial execution (it runs
until the error is encountered).
• Style requirements:
– Approaches for producing a well written program.
– (The real life analogy is that something written in a human language
may follow the grammar but still be poorly written).
– If style requirements are not followed then the program can still be
translated but there may be other problems (more on this during the
term).

James Tam
Variable Naming Conventions (2)
1. Style requirement: The
name should be
meaningful.
2. Style and Python
requirement: Names must
start with a letter (Python
requirement) and should
not begin with an
underscore (style
requirement).
3. Style requirement: Names
are case sensitive but
avoid distinguishing
variable names only by
case.
Examples
#1:
age (yes) x, y (no)
#2
height (yes) 2x, _height (no)
#3
Name, name, nAme (no to this trio)

James Tam
Variable Naming Conventions (2)
4. Style requirement: Variable
names should generally be all
lower case (see next point for
the exception).
5. Style requirement: For names
composed of multiple words
separate each word by
capitalizing the first letter of
each word (save for the first
word) or by using an
underscore. (Either approach
is acceptable but don’t mix
and match.)
6. Python requirement: Can't be
a keyword (see next slide).
Examples
#4:
age, height, weight (yes)
Age, HEIGHT (no)
#5
firstName, last_name
(yes to either approach)

James Tam
Key Words In Python1
and del from not while
as elif global or with
assert else if pass yield
break except import print
class exec in raise
continue finally is return
def for lambda try
1 From “Starting out with Python” by Tony Gaddis

James Tam
Displaying Output Using The Print() Function
• This function takes zero or more arguments (inputs)
– Multiple arguments are separated with commas
– print() will display all the arguments followed by a blank line (move
the cursor down a line).
– end="" isn’t mandatory but can be useful to prevent Python from adding the
extra line (when precise formatting is needed)
– Zero arguments just displays a blank line
• Simple Examples (3output1.py)
print("hi")
print("hey",end="")
print("-sup?")

James Tam
Print("… ") Vs. Print(<name>)
• Enclosing the value in brackets with quotes means the value in
between the quotes will be literally displayed onscreen.
• Excluding the quotes will display the contents of a memory
location.
• Example: 4output2.py
aString = "Some message"
print(aString)
print("aString")

James Tam
Print("… ") Vs. Print(<name>): 2
Format:
print(arg1,arg2 … )1
Example: 5output3.py
num = 10.0
name = "james"
print("Sup?")
print("num=", end="")
print(num)
print()
print("My name: ", name)
1 From what you’ve learned thus far each argument can be a constant string or name of a variable.
Exercise 1:
remove
these quotes
and see if
you can
correctly
predict the
results.
Exercise 2: remove
parts: 1) end=“” 2)
print() and see if you
can correctly predict
the results.

James Tam
• The back-slash character enclosed within quotes won’t be
displayed but instead indicates that a formatting (escape)
code will follow the slash:
Escape Codes/Characters
Escape sequence Description
a Alarm: Causes the program to beep.
n Newline: Moves the cursor to beginning
of the next line.
t Tab: Moves the cursor forward one tab
stop.
' Single quote: Prints a single quote.
" Double quote: Prints a double quote.
Backslash: Prints one backslash.

James Tam
Escape Codes (2)
• Program name: 9formatting4.py
print ("a*Beep!*")
print ("hinthere")
print ('it's')
print ("hey "you"")

James Tam
Escape Codes: Application
• It can be used to nicely format text output (alignment output,
provide separators within and between lines)
• Program example: 10formatting5.py
firstName = "James"
lastName = "Tam"
mobile = "123-4567"
print("Last name:t", lastName)
print("First name:t", firstName)
print("Contact:t", mobile)
• Escape codes for aligning text is even more valuable if the
width of a field (data to be displayed) is variable e.g., comes
from user input or a text file.

James Tam
Extra Practice
• Traces:
– Modify the examples (output using format specifiers and escape
codes) so that they are still valid Python statements.
• Alternatively you can try finding some simple ones online or from a
textbook.
– Hand trace the code (execute on paper) without running the program.
– Then run the program and compare the actual vs. expected result.
• Program writing:
– Write a program the will right-align text into 3 columns of data.
– Write a program the will left-align text into 3 columns of data.

James Tam
Reminder: Variables
• By convention variable names are all lower case
• The exception is long (multi-word) names
• As the name implies their contents can change as a program
runs e.g.,
income = 300000
income = income + interest
Income = income + bonuses

James Tam
Named Constants
•They are similar to variables: a memory location that’s been
given a name.
•Unlike variables their contents shouldn’t change.
•This means changes should not occur because of style reasons rather
than because Python prevents the change
•The naming conventions for choosing variable names generally
apply to constants but the name of constants should be all
UPPER CASE. (You can separate multiple words with an
underscore).
•Example PI = 3.14
•They are capitalized so the reader of the program can
distinguish them from variables.
–For some programming languages the translator will enforce the
unchanging nature of the constant.
–For languages such as Python it is up to the programmer to recognize a
named constant and not to change it.

James Tam
Why Use Named Constants
1. They make your program easier to read and understand
# NO
populationChange = (0.1758 – 0.1257) * currentPopulation
Vs.
#YES
BIRTH_RATE = 17.58
MORTALITY_RATE = 0.1257
currentPopulation = 1000000
populationChange = (BIRTH_RATE - MORTALITY_RATE) *
currentPopulation
Avoid unnamed constants
whenever possible!

James Tam
Why Use Named Constants (2)
2) Makes the program easier to maintain
– If the constant is referred to several times throughout the program,
changing the value of the constant once will change it throughout the
program.
– Using named constants is regarded as “good style” when writing a
computer program.

James Tam
Purpose Of Named Constants (3)
BIRTH_RATE = 0.998
populationChange = 0
currentPopulation
if (populationChange > 0):
print("Increase")
print("Birth rate:", BIRTH_RATE, " Mortality rate:",
MORTALITY_RATE, " Population change:", populationChange)
elif (populationChange < 0):
print("Decrease")
MORTALITY_RATE, "Population change:", populationChange)
else:
print("No change")

James Tam
BIRTH_RATE = 0.998
currentPopulation
print("Increase")
print("Decrease")
else:
print("No change")
One change in the
initialization of the
constant changes every
reference to that
constant

James Tam
BIRTH_RATE = 0.1758
currentPopulation
print("Increase")
print("Decrease")
else:
print("No change")
One change in the
initialization of the
constant changes every
reference to that
constant

James Tam
When To Use A Named Constant?
• (Rule of thumb): If you can assign a descriptive, useful, self-
explanatory name to a constant then you probably should.
• Example 1 (easy to provide self explanatory constant name)
INCH_CM_RATIO = 2.54
height = height * INCH_CM_RATIO
• Example 2 (providing self explanatory names for the
constants is difficult)
calories used = (10 x weight) + (6.25 x height) - [(5 x age)
- 161]

James Tam
Extra Practice
• Provide a formula where it would be appropriate to use
named constants (should be easy).
• Provide a formula where unnamed constants may be
acceptable (may be trickier).
• Search for formulas in science articles online if you can’t think
of any.

James Tam
Section Summary: Named Constants
• What is a named constant
– How does it differ from a variable
– How does it differ from an unnamed constant
– What are some reasons for using named constants
• Naming conventions for named constants

James Tam
Arithmetic Operators
Operator Description Example
= Assignment num = 7
+ Addition num = 2 + 2
- Subtraction num = 6 - 4
* Multiplication num = 5 * 4
/ Division num = 9 / 2
// Integer division num = 9 // 2
% Modulo num = 9 % 2
** Exponent num = 9 ** 2
4.5
4
1
81

James Tam
• First level of precedence: top to bottom
• Second level of precedence
– If there are multiple operations that are on the same level then
precedence goes from left to right.
Order Of Operation
() Brackets (inner before
outer)
** Exponent
*, /, //, % Multiplication, division,
modulo
+, - Addition, subtraction
= Assignment
Example
x = 3 * 2 ** 3
Vs.
x = (3 * 2) ** 3

James Tam
Order Of Operation And Style
• Even for languages where there are clear rules of precedence
(e.g., Java, Python) it’s good style to explicitly bracket your
operations and use blank spaces as separators.
x = (a * b) + (c / d)
• It not only makes it easier to read complex formulas but also
a good habit for languages where precedence is not always
clear (e.g., C++, C).

James Tam
Input
•The computer program getting string information from the user.
•Strings cannot be used for calculations (information for getting
numeric input will provided shortly).
•Format:
<variable name> = input()
OR
<variable name> = input("<Prompting message>")
•Example: Program name: 11input1.py
print("What is your name: ")
name = input()
OR
name = input("What is your name: ")
OR
print("What is your name: ", end="")
name = input()
Avoid alignment
issues such as this

James Tam
Variables: Storing Information (If There Is Time)
• On the computer all information is stored in binary (2 states)
– Example: RAM/memory stores information in a series of on-off
combinations
– A single off/off combination is referred to as a ‘bit’
Bit
on off
OR
Byte
•8 bits

James Tam
Can be stored as
Variables: Storing Information (If There Is Time)
• Information must be converted into binary to be stored on a
computer.
User enters
13
slide 44

James Tam
• 1 bit is used to represent the sign, the rest is used to store
the size of the number
– Sign bit: 1/on = negative, 0/off = positive
• Format:
• Previous example
Storing Integer Information (If There Is Time)
slide 45
Digits representing the size of the
number (all the remaining bits)
Negative
number
Positive
number
1 bit
Positive
number
Size of number, in this case = 13

James Tam
Storing Real Numbers In The Form Of Floating Point
(If There Is Time)
– Mantissa: digits of the number being stored
– Exponent: the direction (negative = left, positive=right) and the number of
places the decimal point must move (‘float’) when storing the real number as a
floating point value.
• Examples with 5 digits used to represent the mantissa:
– e.g. One: 123.45 is represented as 12345 * 10-2
– e.g. Two: 0.12 is represented as 12000 * 10-5
– e.g. Three: 123456 is represented as 12345 * 101
• Remember: Using floating point numbers may result in a loss of accuracy (the float
is an approximation of the real value to be stored).
Sign Mantissa Exponent
1 bit Several bits Several bits

James Tam
• Typically characters are encoded using ASCII
• Each character is mapped to a numeric value
– E.g., ‘A’ = 65, ‘B’ = 66, ‘a’ = 97, ‘2’ = 50
• These numeric values are stored in the computer using
binary
Storing Character Information (If There Is Time)
Character ASCII numeric
code
Binary
code
‘A’ 65 01000001
‘B’ 66 01000010
‘a’ 97 01100001
‘2’ 50 00110010

James Tam
Storing Information: Bottom Line
• Why it important to know that different types of information
is stored differently?
– One motivation: sometimes students don’t why it’s significant that
“123” is not the same as the number 123.
– Certain operations only apply to certain types of information and can
produce errors or unexpected results when applied to other types of
information.
• Example
num = input("Enter a number")
numHalved = num / 2

James Tam
Converting Between Different Types Of Information
• Example motivation: you may want numerical information to
be stored as a string (for built in string functions e.g., check if
a string consists only of numbers) but also you want to
perform calculations).
• Some of the conversion mechanisms (functions) available in
Python:
Format:
int(<value to convert>)
float(<value to convert>)
str(<value to convert>)
Examples:
Program name: 12convert1.py
x = 10.9
y = int(x)
print(x,y)
Conversion function
( )
Value to convert
Converted result

James Tam
Converting Between Different Types Of Information
(2)
Examples:
x = "100"
y = "-10.5"
print(x + y)
print(int(x) + float(y))

James Tam
Converting Types: Extra Practice
• Determine the output of the following program:
print(12+33)
print('12'+'33')
x = 12
y = 21
print(x+y)
print(str(x)+str(y))

James Tam
Converting Between Different Types Of Information:
Getting Numeric Input
• The ‘input()’ function only returns string information so the
value returned must be converted to the appropriate type as
needed.
– Example
# No conversion performed: problem!
HUMAN_CAT_AGE_RATIO = 7
age = input("What is your age in years: ")
catAge = age * HUMAN_CAT_AGE_RATIO
print ("Age in cat years: ", catAge)
• ‘Age’ refers to a string
not a number.
• The ‘*’ is not
mathematical
multiplication

James Tam
Converting Between Different Types Of Information:
Getting Numeric Input (2)
# Input converted: Problem solved!
HUMAN_CAT_AGE_RATIO = 7
age = int(input("What is your age in years: "))
catAge = age * HUMAN_CAT_AGE_RATIO
print("Age in cat years: ", catAge)
• ‘Age’ converted to
an integer.
• The ‘*’ now
multiplies a
numeric value.

James Tam
Section Summary: Input, Representations
• How to get user input in Python
• How do the different types of variables store/represent
information (optional/extra for now)
• How/why to convert between different types

James Tam
Program Documentation / comments
• Program documentation: Used to provide information about
a computer program to another programmer (writes or
modifies the program).
• This is different from a user manual which is written for
people who will use the program.
• Documentation is written inside the same file as the
computer program (when you see the computer program you
can see the documentation).
• The purpose is to help other programmers understand the
program: what the different parts of the program do, what
are some of it’s limitations etc.

James Tam
Program Documentation (2)
• Doesn’t contain instructions for the computer to execute.
• Not translated into machine language.
• Consists of information for the reader of the program:
– What does the program as a while do e.g., calculate taxes.
– What are the specific features of the program e.g., it calculates
personal or small business tax.
– What are it’s limitations e.g., it only follows Canadian tax laws and
cannot be used in the US. In Canada it doesn’t calculate taxes for
organizations with yearly gross earnings over $1 billion.
– What is the version of the program
• If you don’t use numbers for the different versions of your program
then simply use dates (tie versions with program features – more on
this in a moment “Program versioning and backups”).

James Tam
• Format (single line documentation):
# <Documentation>
• Examples:
# Tax-It v1.0: This program will electronically calculate
# your tax return. This program will only allow you to complete
# a Canadian tax return.
The number sign ‘#” flags the
translator that the remainder of the
line is documentation.

James Tam
• Format (multiline documentation):
""" <Start of documentation>
...
<End of documentation> """
• Examples:
"""
Tax-It v1.0: This program will electronically calculate
# your tax return. This program will only allow you to complete
# a Canadian tax return.
"""

James Tam
Program Versioning And Back Ups
• As significant program features have been completed (tested
and the errors removed/debugged) a new version should be
saved in a separate file.
# Version: Sept 20,
2012
# Program features:
# (1) Load game
# (2) Show game world
Game.Sept20
# Version: Sept 20,
2012
# Program features:
# (1) Load game
# (2) Show game
world
Game.py
Make backup file

James Tam
Program Versioning And Back Ups
• As significant program features have been completed (tested
and the errors removed/debugged) a new version should be
saved in a separate file.
# Version: Oct 2,
2012
# Program features:
# (1) Save game
# Version: Sept 20,
2012
# Program features:
# (1) Load game
# (2) Show game
world
Game.py
# Version: Oct 2, 2012
# Program features:
# (1) Save game
# Version: Sept 20, 2012
# Program features:
# (1) Load game
Game.Oct2
Make new
backup file
# Version: Sept 20,
2012
# Program features:
# (1) Load game
Game.Sept20

James Tam
Backing Up Your Work
• Do this every time that you have completed a significant
milestone in your program.
– What is ‘significant’ will vary between people but make sure you do
this periodically.
• Ideally the backup file should be stored in a separate
directory/folder (better yet on a separate device and/or using
an online method such as an email attachment or ‘cloud’
storage).
• Common student reason for not making copies: “Backing up
files takes time!”
• Compare:
– Time to copy a file: ~10 seconds (generous in some cases).
– Time to re-write your program to implement the feature again: 10
minutes (might be overly conservative in some cases).
• Failing to backup your work is not a sufficient reason for
receiving an extension.

James Tam
Over-Documenting A Program
• Except for very small programs documentation should be
included
• However it is possible to over-document a program
• (Stating the obvious)
num = num + 1 # Variable num increased by one
• (Documentation can be useful in this case)
lastRow = SIZE – 1 # Row numbering begins at zero
Example: there are 3 rows in a list (size = 3)
– First row = 0
– Second row = 1
– Third (and last) row = 2 (equals 3-1 = 2)

James Tam
Section Summary: Documentation
• What is program documentation
• What sort of documentation should be written for your
programs
• How program documentation ties into program versioning
and backups

James Tam
Types Of Programming Errors
1. Syntax/translation errors
2. Runtime errors
3. Logic errors

James Tam
DrawingPanel
• To create a window, create a drawingpanel and its
graphical pen, which we'll call g :
from drawingpanel import *
panel = drawingpanel(width, height)
g = panel.get_graphics()
... (draw shapes here) ...
panel.mainloop()
• The window has nothing on it, but we can draw shapes and
lines on it by sending commands to g .
– Example:
g.create_rectangle(10, 30, 60, 35)
g.create_oval(80, 40, 50, 70)
g.create_line(50, 50, 90, 70)
Ghandour

James Tam
Graphical commands
Command Description
g.create_line(x1, y1, x2, y2) a line between (x1, y1), (x2,
y2)
g.create_oval(x1, y1, x2, y2) the largest oval that fits in a
box with top-left corner at (x1,
y1) and bottom-left corner at
(x2, y2)
g.create_rectangle(x1, y1, x2, y2) the rectangle with top-left
corner at (x1, y1), bottom-left
at (x2, y2)
g.create_text(x, y, text="text") the given text at (x, y)
• The above commands can accept optional outline and fill colors.
g.create_rectangle(10, 40, 22, 65,
fill="red", outline="blue")
• The coordinate system is y-inverted:
(0, 0)
(200, 100)
Ghandour

James Tam
Drawing with loops
• We can draw many repetitions of the same item at different
x/y positions with for loops.
– The x or y assignment expression contains the loop counter, i, so that
in each pass of the loop, when i changes, so does x or y.
from drawingpanel import *
window = drawingpanel(500, 400)
g = window.get_graphics()
for i in range(1, 11):
x = 100 + 20 * i
y = 5 + 20 * i
g.create_oval(x, y, x + 50, y + 50, fill="red")
window.mainloop()
• Exercise: Draw the figure at right.
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Eng. & Educator Osama Ghandour
Python

Repetition (loops) in Python.
Offline On line
Ghandour
Python

Selection (if/else) in Python
Offline On line
Ghandour
Python

James Tam
Summary
1-Variables – rules for naming .
2-Constants.
3- Run a program debug it .
4-documentation - comments.
5-Back up a progarm.
Ghandour
Python

James Tam
Reflection
• What is your goal to accomplish in
next week End Using Python?
Ghandour
Python

James Tam
Home work (s. proj.) 1
• Create a presentation contains some concepts of computer
languages (Python) and display the Concepts of Repetition (loops)
and Selection (if/else)following the bellow rubric .
Ghandour
Python

James Tam
Home work 2 (s. proj.)
• Create a small program as a PBL in Collaboration work using
integration to your Capstone project .
Ghandour
Python

James Tam
Rubaric
Blue
Design a presentation showing Python to contain some concepts
Repetition (loops)
and Selection (if/else)
Green
Design a presentation showing Python to contain one or 2
Repetition (loops) and Selection (if/else).
Yellow missing two points of green level.
Read No presentation .
Ghandour
Python

James Tam
Resources
• https://www.youtube.com/user/osmgg2
Other materials:
• https://www.sololearn.com
• https://www.w3schools.com
• www.python.org
• “Learning Python,” 2nd edition, Mark Lutz and David Ascher
(O'Reilly, Sebastopol, CA, 2004) (Thorough. Hard to get into as a
quick read)
Ghandour
Python

James Tam
Learn and practice through on line web sites
https://www.thewebevolved.com
https://www.123test.com/
https://www.wscubetech.com/
https://www.w3schools.com/
https://www.guru99.com
https://codescracker.com/exam/review.php
https://www.arealme.com/left-right-brain/en/
https://www.proprofs.com/
https://www.geeksforgeeks.org/
https://www.tutorialspoint.com
https://www.sololearn.com
http://www.littlewebhut.com/
Ghandour
Python

James Tam
If you do not feel happy, smile and
pretend to be happy.
•Smiling produces seratonin which
is a neurotransmitter linked with
feelings of happiness

Thanks
Ghandour
Python

James Tam
https://twitter.com/osamageris
https://www.linkedin.com/in/osamaghandour/
https://www.youtube.com/user/osmgg2
https://www.facebook.com/osama.g.geris
Ghandour
Python

Programming intro variables constants - arithmetic and assignment operators

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