Podcast
Questions and Answers
What is the purpose of the function randint(a, b) in the random module?
What is the purpose of the function randint(a, b) in the random module?
- To create a list of random items
- To calculate the length of a list
- To generate a random integer between a and b inclusive (correct)
- To sort a list of integers
A ZeroDivisionError occurs when a division by zero is attempted in a program.
A ZeroDivisionError occurs when a division by zero is attempted in a program.
True (A)
What do you call the variables defined within a function's body?
What do you call the variables defined within a function's body?
local variables
When writing your own module, you need to create a new ._________ file containing functions and values.
When writing your own module, you need to create a new ._________ file containing functions and values.
Match the following exceptions with their descriptions:
Match the following exceptions with their descriptions:
What technique involves a function calling itself?
What technique involves a function calling itself?
A for-loop is essential for implementing recursion.
A for-loop is essential for implementing recursion.
In Python, a collection of code files with functions and values is called a ______.
In Python, a collection of code files with functions and values is called a ______.
Match the following keywords with their function in Python modules:
Match the following keywords with their function in Python modules:
Which statement is true regarding global and local variables?
Which statement is true regarding global and local variables?
It is encouraged to use * to import all objects from a module.
It is encouraged to use * to import all objects from a module.
def rec_sum(a_list):
 if a_list == [] :
  return 0
 else:
  return a_list[0] + rec_sum(a_list[1:])
A function that sums the items in a list is utilizing ______.
def rec_sum(a_list):
 if a_list == [] :
  return 0
 else:
  return a_list[0] + rec_sum(a_list[1:])
A function that sums the items in a list is utilizing ______.
What must you do before calling a function in Python?
What must you do before calling a function in Python?
A variable defined inside a function can be accessed from outside that function.
A variable defined inside a function can be accessed from outside that function.
What do modules in Python primarily refer to?
What do modules in Python primarily refer to?
What is the purpose of using the keyword 'global' in a function?
What is the purpose of using the keyword 'global' in a function?
A function that does not take any arguments is called a function with _____ arguments.
A function that does not take any arguments is called a function with _____ arguments.
Modules are imported using the command load module_name.
Modules are imported using the command load module_name.
What is the output of the following code: print(2 + 2)?
What is the output of the following code: print(2 + 2)?
Which of the following statements about local and global variables is true?
Which of the following statements about local and global variables is true?
What is a key benefit of defining functions in Python?
What is a key benefit of defining functions in Python?
___ refer to a collection of functions and definitions in Python.
___ refer to a collection of functions and definitions in Python.
Match the following Python components with their descriptions:
Match the following Python components with their descriptions:
Match the following terms with their definitions:
Match the following terms with their definitions:
Which of the following statements about functions is false?
Which of the following statements about functions is false?
The syntax to define a function in Python starts with the keyword _____ followed by the function name.
The syntax to define a function in Python starts with the keyword _____ followed by the function name.
An exception in Python refers to a standard function.
An exception in Python refers to a standard function.
What is the purpose of using modules in Python?
What is the purpose of using modules in Python?
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Study Notes
Function Motivation
- Defining your own functions promotes code reusability
- Easier to maintain large codebases
Defining a Function
- Use "def" keyword followed by function name and parenthesized arguments
- Indented statement block follows the definition
Zero, One or More Arguments
- Functions can have zero arguments
- Functions can have more than one argument
- Arguments can be of different data types
Local vs Global Variables
- Variables declared inside a function are local
- Local variables cannot be accessed outside the function
- Global variables are defined outside of functions
- Variables assigned values inside a function are local by default
- "global" keyword allows access to a global variable inside a function
Quiz 1
- Output: c) 42 17 17 4 1 15 3 4
Recursion
- A function calling itsef to solve a task
- Example: calculate the sum of items in a list without a for-loop
- Use a "base case" to stop recursive calls
- "Recursive case" handles the rest of the task
Modules
- Modules are pieces of code saved in .py files containing functions and values
- Used for common tasks
- Import modules using "import module_name"
- Access module functions and values using "module_name.var"
- Import specific functions using "from module_name import var"
Quiz 3
- Output: c) An error occurs
Modules: Three Types
- Preinstalled modules: accessible in the Python Standard Library
- Self-written modules: create a .py file with the module name, import using the file name without extension
- Third-party modules: installed by third-party sources, install using PIP
Examples
- Generate a list of n random integers between 0 and 10
- Create a function "random_list" that takes n as input and returns a list of n random integers
Exceptions
- Occur when code encounters issues
- Can be caused by incorrect code or input
- Without exception handling, program terminates
- Different exceptions are raised for different reasons
- Common exceptions include ZeroDivisionError, ImportError, IndexError, NameError, SyntaxError
Quiz 2
- Output: 3. 4 is maximum
Quiz 4
- Output: Answers: Error message because variables c and d are not visible to the function mean() 35 35 4.0 53 53 4.0
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