Python Conditional Statements

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson
Download our mobile app to listen on the go
Get App

Questions and Answers

In Python, which statement is used to execute a block of code only if a specified condition is true?

  • `else`
  • `if` (correct)
  • `elif`
  • `while`

In Python, indentation is purely for readability and does not affect the execution of conditional statements.

False (B)

What is the primary purpose of the elif statement in Python?

To specify a new condition if the first condition is false

The ______ statement in Python is used to execute a block of code when the condition in the if statement is false.

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

Match each conditional statement with its correct description in Python:

<p><code>if</code> = Specifies a block of code to be executed if a condition is true. <code>else</code> = Specifies a block of code to be executed if the same condition is false. <code>elif</code> = Specifies a new condition to test if the first condition is false.</p>
Signup and view all the answers

Which of the following is the correct syntax for an if statement in Python?

<p>if condition: code (D)</p>
Signup and view all the answers

In Python, logical conditions such as equals, not equals, less than, and greater than can only be used within if statements and not within loops.

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

In Python, what error will occur if the code inside an if statement is not properly indented?

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

In a nested if statement, the inner if statement is executed only if the condition of the ______ if statement is true.

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

Match each logical operator with its corresponding symbol in Python:

<p>Equals = <code>==</code> Not Equals = <code>!=</code> Less than = <code>&lt;</code> Greater than or equal to = <code>&gt;=</code></p>
Signup and view all the answers

What output will the following Python code produce?

a = 15
if a > 10:
    print("Above 10")
if a > 20:
    print("Above 20")
else:
    print("Not above 20")

<p>Above 10 Not above 20 (D)</p>
Signup and view all the answers

In Python, you can only have one elif statement in a conditional block.

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

In Python, what keyword is used to introduce the first conditional check in a series of conditional statements?

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

In Python, the condition in an if statement must evaluate to a ______ value (True or False).

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

Match the conditional operator with its definition:

<p><code>a == b</code> = Checks if <code>a</code> is equal to <code>b</code>. <code>a != b</code> = Checks if <code>a</code> is not equal to <code>b</code>. <code>a &lt; b</code> = Checks if <code>a</code> is less than <code>b</code>. <code>a &gt; b</code> = Checks if <code>a</code> is greater than <code>b</code>.</p>
Signup and view all the answers

What is the purpose of the following Python code?

if x > 5:
    y = 10
else:
    y = 5

<p>To assign the value of 10 to y if x is greater than 5, otherwise assign 5 to y (B)</p>
Signup and view all the answers

In Python, the else block in an if-else statement is optional.

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

In Python, how does the use of elif differ from using multiple separate if statements?

<p><code>elif</code> is only checked if the preceding <code>if</code> (or <code>elif</code>) condition is false, whereas separate <code>if</code> statements are always checked</p>
Signup and view all the answers

The primary reason Python relies on ______ to define scope in conditional statements is to enhance code readability and avoid ambiguity.

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

Match the conditional statement with its corresponding usage.

<p><code>if</code> statement = To execute a block of code if a condition is true <code>else</code> statement = To execute a block of code if the condition in the 'if' statement is false <code>elif</code> statement = To specify a new condition to test, if the first condition is false</p>
Signup and view all the answers

What will be printed when the following Python code is executed?

x = 5
if x > 10:
    print("Greater than 10")
elif x > 5:
    print("Greater than 5")
else:
    print("Not greater than 5")

<p>Not greater than 5 (D)</p>
Signup and view all the answers

In Python, an if statement can be used without an elif or else statement.

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

Explain the significance of the colon (:) at the end of an if statement’s condition in Python.

<p>It signifies the start of an indented block to be executed if the condition is true.</p>
Signup and view all the answers

A nested if statement is an if statement inside ______ if statement(s).

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

Match the following descriptions of different Python conditional statement structures:

<p>Simple <code>if</code> = A single condition, executed if true. <code>if-else</code> = A condition and an alternative if the condition is false. <code>if-elif-else</code> = Multiple conditions with a default at the end if none are true. Nested <code>if</code> = Conditional statements within other conditional statements.</p>
Signup and view all the answers

What output will the following Python code produce?

age = 25
if age > 10:
    print("Above 10")
    if age > 20:
        print("Above 20")
    else:
        print("Not above 20")

<p>Above 10 Above 20 (D)</p>
Signup and view all the answers

In Python, the else statement can be used independently without an if statement.

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

In the context of Python conditional statements, what is a 'logical condition'?

<p>An expression that evaluates to either <code>True</code> or <code>False</code>.</p>
Signup and view all the answers

In Python, when using a nested if statement, the level of ______ determines which if the else statement belongs to.

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

Match the examples of Python conditional statements with their output based on x = 7 and y = 10.

<p><code>if x &lt; y: print(&quot;x is less than y&quot;)</code> = <code>x is less than y</code> <code>if x == y: print(&quot;x and y are equal&quot;) else: print(&quot;x and y not equal&quot;)</code> = <code>x and y not equal</code> <code>if x &gt; 10: print(&quot;x is greater than 10&quot;) elif x &gt; 5: print(&quot;x is greater than 5&quot;) else: print(&quot;x is not greater than 5&quot;)</code> = <code>x is greater than 5</code></p>
Signup and view all the answers

Flashcards

Conditional Statements

Statements that execute different code based on conditions.

"if" statement

A conditional statement that executes a block of code if a condition is true.

"else" statement

A conditional statement that executes a block of code if the condition in the "if" statement is false.

"elif" statement

A conditional statement that tests a new condition if the initial "if" condition is false.

Signup and view all the flashcards

Equals (==)

The equality operator in Python. Checks if two variables are equal.

Signup and view all the flashcards

Not Equals (!=)

The 'not equals' operator in Python.

Signup and view all the flashcards

Less than (a < b)

Symbol to check if a is less than b

Signup and view all the flashcards

Greater than (a > b)

Symbol to check if a is greater than b

Signup and view all the flashcards

Less than or equal to (<=)

Symbol to check if a is less than or equal to b

Signup and view all the flashcards

Greater than or equal to (a >= b)

Symbol to check if a is greater than or equal to b

Signup and view all the flashcards

Indentation in Python

Whitespace at the start of a line

Signup and view all the flashcards

Nested if Statement

When one if statement is inside another

Signup and view all the flashcards

Study Notes

Conditional Statements

  • Conditional statements enable programs to perform different actions based on specified conditions

Types of Conditional Statements

  • if specifies executing a code block when a condition is true
  • else specifies executing a code block when the condition is false
  • elif specifies a new condition to test when the initial condition is false

Python's Logical Conditions

  • Equals: a == b
  • Not Equals: a != b
  • Less than: a < b
  • Less than or equal to: a <= b
  • Greater than: a > b
  • Greater than or equal to: a >= b

Example usage of if statement

  • The following code tests if b is greater than a and prints "b is greater than a" if true
a = 33
b = 200

if b > a:
  print("b is greater than a")

Indentation

  • Python uses indentation to define the scope of code
  • Other programming languages use curly brackets for this purpose
  • Missing indentation in an if statement raises an error

If Statement Syntax

if <EXPRESSION>:
  # if block of statements
  • The if statement allows a block of Python code if a condition is true

Else Statement Syntax

if <EXPRESSION>:
 # if block of statements
else:
 # else block of statements
  • else statement is used to execute code if the initial condition is false

Nested If Statement Syntax

If <EXPRESSION>:
 # if block of statements
 If <EXPRESSION> :
  # if block of statements
 else:
  # elif block of statements
  • Nested if statements involve placing if statements inside other if statements

Example of a Nested If Statement

age = 13

if age> 10 :
 print("Above 10")
 if age> 20 :
  print("and also above 20")
 else :
  print(" but not above 20")

Elif Statement Syntax

if <EXPRESSION>:
 # if block of statements
elif <EXPRESSION>:
 # elif block of statements
else:
 # else block of statements
  • The elif statement allows you to test multiple conditions in sequence

Elif Statement Example

time = 15
if time < 10 :
 greeting = "Good morning"
elif time < 20 :
 greeting = "Good day"
else :
 greeting = "Good evening"
  • In the example, different greetings are assigned based on the "time"

Types of If Statements

  • if statement is the primary conditional statement
  • else statement provides an alternative action when the if condition is false
  • elif statement introduce additional conditions

Example of If Statements

x, y = 10, 20

if x == y :
 print("x and y are equal.")
if x < y :
 print("x is less than y.")
if x > y : # If there is only one line of statement to be executed,
  # the curly brackets ({}) can be omitted
 print("x is greater than y.")

Example of Else Statement

x = 200
if x < 100 :
  print("It is less than 100.")
else :
  print("It is greater than or equal to 100.")

Additional Example of Else Statement

a = 200
## If the remainder when a is divided by 2 is 0, it is even; otherwise, it is odd.

if a % 2 == 0 : # if division remainder is 0, a is even
 print(“a is even.")
else : # if (a % 2 != 0) , if division remainder is not 0, a is add
 print(“a is odd.”)

Example of Nested If Statements

x, y = 10, 20
if x == y :
 print("x and y are equal.")
if x < y :
 print("x is less than y.")
if (x > y) :
 print("x is greater than y.")
}

x, y =10, 20
if x == y :
 print("x and y are equal.")
else : # x != y
 if x < y : print("x is less than y.")
 else :
  print("x is greater than y.")

Example of Elif Statements

x , y = 10, 20

if x == y :
 print("x and y are equal.")
elif x < y : # (x != y) and (x < y)
 print("x is less than y.")
else : # (x != y) and (x > y)
 print("x is greater than y.")

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

Related Documents

More Like This

Use Quizgecko on...
Open
Browser
Browser