Python Basics: Variables, Functions, and More

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Questions and Answers

How many lines of code need to be changed to make the calculate function return the product instead of the sum?

  • 2
  • 0
  • 1 (correct)
  • 3

What output is produced by the function print_water_temp_for_coffee when called with a temperature of 205?

  • Too hot.
  • Perfect temperature. (correct)
  • Temperature acceptable.
  • Too cold.

What will be the output of printing calc(4, 5) and calc(1, 2)?

  • 10 5
  • 10 4 (correct)
  • 11 5
  • 11 4

What are exceptions designed to handle in a program?

<p>Errors or unusual cases (D)</p> Signup and view all the answers

Which of the following is NOT a keyword related to exception handling in Python?

<p>Throwing (B)</p> Signup and view all the answers

Which symbol in Python is used to create a comment?

<h1>(A)</h1> Signup and view all the answers

What is the resulting value of the expression: 1 + int(3.5) / 2?

<p>2.5 (D)</p> Signup and view all the answers

What is the data type used for floating point numbers in Python?

<p>Float (D)</p> Signup and view all the answers

What does the expression 'key != 'q'' evaluate to when a user types 'q'?

<p>0 (B), (C)</p> Signup and view all the answers

Which of the following correctly removes the value 'Google' from a set named companies?

<p>companies.remove('Google') (A)</p> Signup and view all the answers

If grade is assigned the value 75, which letter will be output based on the given logic block?

<p>B (A)</p> Signup and view all the answers

What is the term for a word that is part of the Python language and cannot be used as a variable name?

<p>Keyword (D)</p> Signup and view all the answers

What is the value of x after executing the statement 'x = -2'?

<p>-2 (B)</p> Signup and view all the answers

Flashcards

Variables in programming

Symbols used to represent data values in a program.

Python comment symbol

Used to add notes to code that are ignored by the interpreter.

int() function

Transforms a string into an integer.

Runtime error

An error that occurs during program execution.

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IDE

An integrated development environment used to create and run programs.

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Remainder of 15 / 3

The result of the modulo (%) operation applied to 15 and 3.

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Print statement for "I won't quit!"

Displays the specified string to the console.

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Float Data Type

Represents numbers with decimal points..

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Function Return Value Change

Changing a function to return a product instead of a sum requires a single code alteration.

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Conditional Temperature Check

Checks if a given temperature is within the ideal range for coffee, printing appropriate messages.

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Function Return Values

A function's return value is the result produced by the function after execution.

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Function Call Return Point

After a function completes its tasks, the program execution resumes from the line immediately following the function call.

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Exception Handling

Exceptional cases or errors during program execution are managed by special mechanisms.

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Study Notes

Variables and Comments

  • Variables are symbols representing data
  • The symbol '#' is used for comments in Python
  • int() converts strings to integers

Errors and Functions

  • Dividing by zero is a runtime error
  • IDEs are used for program development including source code writing
  • int() converts strings to integers

Data Types

  • float is the data type for floating-point numbers
  • -2 is the result of x after the code provided.
  • keyword can't be used as a variable name in Python
  • print('I won\'t quit!') displays the literal string I won't quit!
  • print(f'{"Tokyo":s} had {9.273000:f} million people in {2015:d}') displays Tokyo had 9.273000 million people in 2015

Set Operations

  • companies.remove('Google') removes 'Google' from the companies set.

Lists and Operations

  • names_list + digits_list concatenates the two lists.
  • The result of names_list is ['one', 'two', 'three', '1', '2', '3']

String Indexing

  • text_line[6] extracts the character at index 6 from the string text_line.
  • The result is 'S'.

Conditional Logic

  • Logic to determine a user's input for continuing or quitting (key != 'q')

Conditional Statements

  • Statements for determining the Output given different x values
  • -x values from 21 to 40 correspond to "Medium" output

Conditional Output

  • A grade of 75 results in "C" being printed (as per the given conditional logic)

Operator Precedence

  • The multiplication (*) operation is evaluated before addition (+) and subtraction (-) in the expression x + y < y - z * 2
  • Looping and values- Loops can work with negative values as well.

Looping

  • Iteration describes each cycle of a loop
  • Infinite loops are generally not desirable and are not favorable

Function Execution and Return

  • After a function's last statement, the program returns to the line following the function call
  • calc_square_area(val) returns the calculated area value

Exceptions

  • Exceptions handle errors in programs
  • EOFError, ZeroDivisionError, and ValueError are examples of common exceptions in Python
  • The programmer is able to define their own exception types.

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