python functions - stanford universitydata structures midterm graphics object-oriented programming...
TRANSCRIPT
![Page 1: Python Functions - Stanford UniversityData structures Midterm Graphics Object-Oriented Programming Everyday Python Life aer CS106AP! Day 1! Data structures Everyday Python Object-Oriented](https://reader034.vdocument.in/reader034/viewer/2022042802/5f40c350bd222948ad4d5ce7/html5/thumbnails/1.jpg)
Python FunctionsCS106AP Lecture 6
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RoadmapProgramming Basics
The Console Images
Data structures
MidtermGraphics
Object-Oriented Programming
Everyday Python
Life after CS106AP!
Day 1!
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Data structures
Everyday PythonObject-Oriented Programming
MidtermGraphics
Images
Programming Basics
RoadmapThe Console
Life after CS106AP!
Day 1!Python
FunctionsStrings and the Console
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Today’s questions
How do we translate what we know from Karel into regular Python code?
How can we make our code more flexible by producing different outputs depending on the input?
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Today’s topics
1. Introduction and Review
2. Range For Loops
3. Python Functions
4. Variable Scope
5. What’s next?
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Who am I?
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Sonja Johnson-Yu
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Sonja Johnson-Yu
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Sonja Johnson-Yu
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Sonja Johnson-Yu
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Review
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Variables
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What is a variable?
A variable is a container for storing a data value.
num_flowers = 5 num_flowers 5variable’s
name
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What is a variable?
A variable is a container for storing a data value.
num_flowers = 5 num_flowers 5
variable’svalue
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Terminology summary
● Variables have a name and are associated with a value
● Variable assignment is the process of associating a value with the name (use the equals sign =)
● Retrieval is the process of getting the value associated with the name (use the variable’s name)○ This is how you use variables!
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Expressions
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Recall: expressions
● The computer evaluates expressions to a single value
● We use operators to combine literals and/or variables into expressions
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Arithmetic operators
* Multiplication
/ Division
// Integer division
% Modulus (remainder)
+ Addition
- Subtraction
Operator Precedence
() 1
*, /, //, % 2
+, - 3
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Arithmetic operators
* Multiplication
/ Division
// Integer division
% Modulus (remainder)
+ Addition
- Subtraction
Operator Precedence
() 1
*, /, //, % 2
+, - 3
Integer division takes the largest integer that is equal to or smaller than the quotient
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Integer Division Practice!
● 5 + 1 // 2● 9 // 3● 8 // 3● -8 // 3
Integer division takes the largest integer that is equal to or smaller than the quotient
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Integer Division Practice!
● 5 + 1 // 2 = 5● 9 // 3 = 3● 8 // 3 = 2● -8 // 3 = -3
Integer division takes the largest integer that is equal to or smaller than the quotient
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How can I repeat a task a finite number of times?
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While loop with variables
counter = 0while counter < 3:
do_something()counter += 1
WARNING: do not use variables on Karel!
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While loop with variables
counter = 0while counter < 3:
do_something()counter += 1
This is the same thing as:counter = counter + 1
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While loop with variables
counter = 0while counter < 3:
do_something()counter += 1
Generally, x += y is the same as:x = x + y
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While loop with variables
counter = 0while counter < 3:
do_something()counter += 1
Generally, x += y is the same as:
You can also do: -=, *=, /=x = x + y
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While loop with variables
counter = 0while counter < 3:
do_something()counter += 1
Computer scientists count from 0.
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While loop with variables
counter = 0while counter < 3:
do_something()counter += 1
counter 0
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While loop with variables
counter = 0while counter < 3:
do_something()counter += 1
counter 0
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While loop with variables
counter = 0while counter < 3:
do_something()counter += 1
counter 0
True
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While loop with variables
counter = 0while counter < 3:
do_something()counter += 1
counter 1
True
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While loop with variables
counter = 0while counter < 3:
do_something()counter += 1
counter 2
True
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While loop with variables
counter = 0while counter < 3:
do_something()counter += 1
counter 3
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While loop with variables
counter = 0while counter < 3:
do_something()counter += 1
counter 3
False!
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For loops
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For loop with range
for i in range(3):do_something()
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For loop with range
for i in range(3):do_something()
for loopA way to repeat a block of code a specific number of
times
Definition
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For loop with range
for i in range(3):do_something()
Tells us we’re going to loop through one by one
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For loop with range
for i in range(3):do_something()
A variable that helps us keep track of where we are (index)
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For loop with range
for i in range(3):do_something()
Number of iterations
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For loop with range
for i in range(3):do_something()
Can be a variable, as long as it’s an int!
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For loop with range
for i in range(3):do_something()
Built-in function
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Range
range(3) -> iterates through 0,1,2
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Range
range(3) -> iterates through 0,1,2range(0, 3) -> iterates through 0,1,2
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Range
range(3) -> iterates through 0,1,2range(0, 3) -> iterates through 0,1,2range(4, 7) -> iterates through 4,5,6
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Range
for i in range(end_index):# assumes 0 is the start index
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Range
for i in range(end_index):# assumes 0 is the start index
for i in range(start_index, end_index):# end_index is not inclusive!# recall: range(4,7) -> 4,5,6
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How can I make my code more flexible?
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Python Functions
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turn_right()math.sqrt(4)
print(x) front_is_clear()
average(x, y)
predict_temperature()
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def turn_right():turn_left()turn_left()turn_left()
Karel Functions
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def move_x_times():# ????
Karel Functions
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def move_x_times():# ????
Karel Functions
How can we make functions more flexible and reusable by producing different outputs?
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Function Analogy
toaster()
Slide adapted from Chris Piech
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toaster(bread)
Function Analogy
bread
Slide adapted from Chris Piech
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toaster(bread)
Function Analogy
toastbread
Slide adapted from Chris Piech
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toaster(bagel)
Function Analogy
bagel
Slide adapted from Chris Piech
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toaster(bagel)
Function Analogy
bagel
Slide adapted from Chris Piech
You don’t need a different toaster for toasting bagels! Use the same one.
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toaster(bagel)
Function Analogy
toasted bagel
bagel
Slide adapted from Chris Piech
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Anatomy of a Function
function(input)input output
parameter(s)/arguments
“return value”
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Anatomy of a Function
def function_name(param1, param2):result = # do somethingreturn result
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Anatomy of a Function
def function_name(param1, param2):result = # do somethingreturn result function
definition
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Anatomy of a Function
def function_name(param1, param2):result = # do somethingreturn result name
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Anatomy of a Function
def function_name(param1, param2):result = # do somethingreturn result input expected
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Anatomy of a Function
def function_name(param1, param2):result = # do somethingreturn result parameters
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def function_name(param1, param2):result = # do somethingreturn result parameter(s)
One or more variables that a
function expects as input
Anatomy of a Function
Definition
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Anatomy of a Function
def function_name(param1, param2):result = # do somethingreturn result
output expected
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Anatomy of a Function
def function_name(param1, param2):result = # do somethingreturn result
return value
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Think/Pair/Share:Find the function definition, function name, parameter(s), and return value.
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Anatomy of a Function
def main():mid = average(10.6, 7.2)print(mid)
def average(a, b):sum = a + breturn sum / 2
Think/Pair/Share:
Find the function definition, function name, parameter(s), and return
value in average.
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Anatomy of a Function
def main():mid = average(10.6, 7.2)print(mid)
def average(a, b):sum = a + breturn sum / 2
function definition
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Anatomy of a Function
def main():mid = average(10.6, 7.2)print(mid)
def average(a, b):sum = a + breturn sum / 2
name
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Anatomy of a Function
def main():mid = average(10.6, 7.2)print(mid)
def average(a, b):sum = a + breturn sum / 2 parameters
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Anatomy of a Function
def main():mid = average(10.6, 7.2)print(mid)
def average(a, b):sum = a + breturn sum / 2 parameters
return value
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Anatomy of a Function
def main():mid = average(10.6, 7.2)print(mid)
def average(a, b):sum = a + breturn sum / 2
return value
Return valueValue that a function
hands back to the “calling” function
Definition
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Anatomy of a Function
def main():mid = average(10.6, 7.2)print(mid)
def average(a, b):sum = a + breturn sum / 2
return value
Return valueValue that a function
hands back to the “calling” function
Definition
What is the “calling” function?
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Anatomy of a Function
def main():mid = average(10.6, 7.2)print(mid)
def average(a, b):sum = a + breturn sum / 2
caller(calling function)
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Anatomy of a Function
def main():mid = average(10.6, 7.2)print(mid)
def average(a, b):sum = a + breturn sum / 2
caller(calling function)
callee(called function)
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Anatomy of a Function
def main():mid = average(10.6, 7.2)print(mid)
def average(a, b):sum = a + breturn sum / 2
function “call”
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Anatomy of a Function
def main():mid = average(10.6, 7.2)print(mid)
def average(a, b):sum = a + breturn sum / 2
arguments
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Anatomy of a Function
def main():mid = average(10.6, 7.2)print(mid)
def average(a, b):sum = a + breturn sum / 2
arguments
What’s the difference between arguments and parameters?
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Anatomy of a Function
def main():mid = average(10.6, 7.2)print(mid)
def average(a, b):sum = a + breturn sum / 2 parameters are the name of input
values in the function definition
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Anatomy of a Function
def main():mid = average(10.6, 7.2)print(mid)
def average(a, b):sum = a + breturn sum / 2
arguments are the values passed in when function is called!
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Anatomy of a Function
def main():mid = average(10.6, 7.2)print(mid)
def average(a, b):sum = a + breturn sum / 2
Note that we’re storing the returned value in a variable!
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Recall from last lecture:
>>> math.sqrt(4)
2.0
Function
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Recall from last lecture:
>>> math.sqrt(4)
2.0
Argument
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Recall from last lecture:
>>> math.sqrt(4)
2.0
Return value
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Anatomy of a Function
math.sqrt(4)4 2.0
argument return value
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Think/Pair/Share:Write a function that takes in two values and outputs the sum of their squares.
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Think/Pair/Share:Write a function that takes in two values and outputs the sum of their squares. [demo]
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Functions as Python Objects
def add(x, y):return x + y add function
object
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def turn_right():turn_left()turn_left()turn_left()
Parameters and return values are optional
“I’m a function too!”
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def turn_right():turn_left()turn_left()turn_left()
Parameters and return values are optional
“I’m a function too!”
no parameters
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def turn_right():turn_left()turn_left()turn_left()
Parameters and return values are optional
“I’m a function too!”no return value
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When am I allowed to use a variable?
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Scope
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Scope Variable Life Expectancy
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scopeThe parts of a program where you can access
a variable
Definition
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def main():function_name()print(y)
def function_name():x = 2y = 3
Variable Scope
this is the scopewhere x and y “live”
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Variable Scope
def main():function_name()print(y)
def function_name():x = 2y = 3
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Variable Scope
def main():function_name()print(y)
def function_name():x = 2y = 3
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Variable Scope
def main():function_name()print(y)
def function_name():x = 2y = 3
x 2
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Variable Scope
def main():function_name()print(y)
def function_name():x = 2y = 3
x 2
3y
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def main():function_name()print(y)
def function_name():x = 2y = 3
Variable Scope
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def main():function_name()print(y)
def function_name():x = 2y = 3
Variable Scope
NameError
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def main():function_name()print(y)
def function_name():x = 2y = 3
Variable Scope
y is now out of scope!
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def main():function_name()print(y)
def function_name():x = 2y = 3
Variable Scope
y is now out of scope!
Once a function finishes executing, the variables declared inside of it are no longer accessible!
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def main():y = function_name()print(y)
def function_name():x = 2y = 3return y
Unless...
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def main():y = function_name()print(y)
def function_name():x = 2y = 3return y
Unless...
if we return y, we can use it in main()
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Let’s put it all together!
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Receipt program
● What subtasks can we break this program into?
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Receipt program
● What subtasks can we break this program into?○ calculating tax○ calculating the tip○ aggregating tax and tip
[demo]
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Today’s questions
How do we translate what we know from Karel into regular Python code?
How can we make our code more flexible by producing different outputs depending on the input?
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What’s next?
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Tomorrow: making programs interactive!
● Strings: representations of text
● Interactive programs
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Data structures
Everyday PythonObject-Oriented Programming
MidtermGraphics
Images
Programming Basics
RoadmapThe Console
Life after CS106AP!
Day 1!Python
FunctionsStrings and the Console