Python Control Flow and Statements

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Questions and Answers

Which keywords are used for control flow in Python?

  • while
  • for
  • elif (correct)
  • if (correct)

The indentation system is not important in Python.

False (B)

What is the purpose of an if statement?

To execute code only when a particular condition is met.

In Python, control flow utilizes the keywords _____ and _____ for alternative conditions.

<p>elif, else</p> Signup and view all the answers

Match the following control flow components with their descriptions:

<p>if = Checks a condition and executes code if true elif = Checks another condition if the previous one is false else = Executes code if all previous conditions are false</p> Signup and view all the answers

What keyword is used to start a conditional statement in Python?

<p>if</p> Signup and view all the answers

What is the purpose of the 'elif' keyword in Python?

<p>To specify additional conditions if the previous 'if' statement is false</p> Signup and view all the answers

What does the 'else' keyword do in a conditional statement?

<p>Executes a block of code if the 'if' condition is false</p> Signup and view all the answers

The indentation in Python is optional for control flow statements.

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

In Python, the syntax of an if statement ends with a ___

<p>colon (:)</p> Signup and view all the answers

Which of the following keywords are used in Python for control flow?

<p>if (C), elif (D)</p> Signup and view all the answers

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Study Notes

Control Flow

  • Python uses keywords like if, elif, and else to control the flow of logic in code.
  • This allows specific code to execute only when a condition is met.
  • Example: If a dog is hungry, then feed the dog.

Indentation

  • The indentation system is crucial to Python and helps distinguish it from other programming languages.
  • Colon (:) is used to indicate the start of a code block.
  • The code that follows the colon must be indented to work.

if Statement

  • Example: 
    if some_condition:
    # execute some code

if-else Statement

  • Example: 
    if some_condition:
    # execute some code
else:
    # do something else

if-elif-else Statement

  • Example: 
    if some_condition:
     # execute some code
elif some_other_condition:
     # do something different
else:
     # do something else

Lecture 4: Python Statements Part 1

  • Control Flow is used to execute code under specific conditions
  • if, elif, else statements are used to control code flow based on specific conditions
  • Colon (:) and indentation are crucial parts of Python syntax, separating code blocks
  • Indentation is the use of whitespace (отступы) to clearly define code blocks
  • if statement executes code if a specific condition is met. Syntax:
if some_condition:
    # execute some code
  • else statement executes code if the condition in the if statement is not met. Syntax:
if some_condition:
    # execute some code
else:
    # do something else
  • elif statement allows for multiple conditions to be checked. Syntax:
if some_condition:
    # execute some code
elif some_other_condition:
    # do something different
else:
    # do something else

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