Scripting with variables and loops in Azure - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a variable named 'resourceGroup' with the value 'myResourceGroup'.

Azure

resourceGroup = "[1]"

Drag options to blanks, or click blank then click option'

AmyGroup

BresourceGroup

CgroupName

DmyResourceGroup

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to use quotes around the string value.

Using the wrong variable name.

The variable resourceGroup should be assigned the string "myResourceGroup".

2fill in blank

medium

Complete the code to create a loop that iterates over the list of VM names.

Azure

for vm in [1]:
    print(vm)

Drag options to blanks, or click blank then click option'

A["vm1", "vm2", "vm3"]

BvmList

CvmNames

Dvms

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that is not defined.

Not using a list to iterate over.

The loop should iterate over the list ["vm1", "vm2", "vm3"] to print each VM name.

3fill in blank

hard

Fix the error in the code to correctly increment the counter variable inside the loop.

Azure

count = 0
for i in range(5):
    count [1] 1

Drag options to blanks, or click blank then click option'

A+=

B-=

C==

D=

Attempts:

3 left

💡 Hint

Common Mistakes

Using assignment = instead of increment +=.

Using comparison operator == by mistake.

The operator += correctly increments the variable count by 1 inside the loop.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps VM names to their lengths, but only for names longer than 3 characters.

Azure

{vm[1]: len(vm) for vm in vmList if len(vm) [2] 3}

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A.upper()

B>

C<

D.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong comparison operator.

Not applying a string method to the VM name.

The dictionary keys are the VM names converted to uppercase using .upper(). The condition filters names with length greater than 3 using >.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps VM names in lowercase to their status, but only include VMs with status 'running'.

Azure

{vm[1]: status for vm, status in vmStatus.items() if status [2] '[3]'}

Drag options to blanks, or click blank then click option'

A.lower()

B==

Crunning

D.upper()

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong string method for VM names.

Using assignment = instead of comparison ==.

Misspelling the status string.

The VM names are converted to lowercase using .lower(). The condition checks if the status equals 'running' using ==.

Practice

1. What is the main purpose of using variables in Azure scripting?

easy

A. To store values that can be reused throughout the script

B. To create loops that repeat commands

C. To delete resources automatically

D. To connect to the internet

Solution

1. Step 1: Understand what variables do

   Variables hold information like names or numbers that you want to use again without typing them multiple times.

2. Step 2: Identify the correct purpose in scripting

   Variables help scripts remember values so you can use them repeatedly and easily change them if needed.

3. Final Answer:

   To store values that can be reused throughout the script -> Option A

4. Quick Check:

   Variables = reusable values [OK]

Hint: Variables hold values to reuse in scripts [OK]

Common Mistakes:

• Confusing variables with loops
• Thinking variables delete resources
• Believing variables connect to internet

2. Which of the following is the correct way to declare a variable named count with value 5 in an Azure CLI script?

easy

A. var count = 5

B. let count = 5

C. set count=5

D. count=5

Solution

1. Step 1: Recall Azure CLI variable syntax

   In Azure CLI scripts (bash style), variables are assigned without keywords using name=value format.

2. Step 2: Match the correct syntax

   count=5 uses count=5, which is the correct bash style assignment.

3. Final Answer:

   count=5 -> Option D

4. Quick Check:

   Azure CLI variable = name=value [OK]

Hint: Use name=value to assign variables in Azure CLI [OK]

Common Mistakes:

• Using 'var' or 'let' which are not bash syntax
• Using 'set' which is Windows CMD syntax
• Adding spaces around '=' which breaks assignment

3. What will be the output of this Azure CLI script snippet?

for i in 1 2 3; do
  echo $((i * 2))
done

medium

A. 2 4 6

B. 0 1 2

C. 1 2 3

D. Syntax error

Solution

1. Step 1: Understand the loop iterations

   The loop runs with i values 1, then 2, then 3.

2. Step 2: Calculate the expression inside echo

   Each iteration prints i multiplied by 2: 1*2=2, 2*2=4, 3*2=6.

3. Final Answer:

   2 4 6 -> Option A

4. Quick Check:

   Loop * 2 = 2 4 6 [OK]

Hint: Multiply loop variable inside $(( )) for math [OK]

Common Mistakes:

• Confusing echo $i with echo $((i * 2))
• Expecting space-separated output on one line
• Thinking syntax error due to missing semicolons

4. Identify the error in this Azure CLI script snippet:

for i in 1 2 3 do
  echo $i
done

medium

A. echo command is incorrect

B. Variable $i is not defined

C. Missing semicolon or newline after for statement

D. done keyword is missing

Solution

1. Step 1: Check for correct for loop syntax

   In bash scripts, the for loop header must end with a semicolon or a newline before the do keyword.

2. Step 2: Identify the missing semicolon or newline

   The snippet has no semicolon or newline after for i in 1 2 3, causing syntax error.

3. Final Answer:

   Missing semicolon or newline after for statement -> Option C

4. Quick Check:

   For loop header needs semicolon/newline before do [OK]

Hint: Add semicolon or newline before do in for loops [OK]

Common Mistakes:

• Forgetting semicolon after for statement
• Assuming $i is undefined
• Thinking echo syntax is wrong

5. You want to create 3 Azure resource groups named rg1, rg2, and rg3 using a script with a loop and a variable prefix rg. Which script snippet correctly achieves this?

hard

A. prefix=rg
for i in 1 2 3; do
az group create --name $prefix + $i --location eastus
done

B. prefix=rg
for i in 1 2 3; do
az group create --name "$prefix$i" --location eastus
done

C. prefix=rg
for i in 1 2 3; do
az group create --name prefix$i --location eastus
done

D. for i in 1 2 3; do
az group create --name "rg" + i --location eastus
done

Solution

1. Step 1: Understand variable concatenation in bash

   To combine a variable and a number, use double quotes and place variables side by side like "$prefix$i".

2. Step 2: Check each option for correct syntax

   prefix=rg for i in 1 2 3; do az group create --name "$prefix$i" --location eastus done correctly uses "$prefix$i" to form names rg1, rg2, rg3. Others use invalid concatenation or miss quotes.

3. Final Answer:

   prefix=rg for i in 1 2 3; do az group create --name "$prefix$i" --location eastus done -> Option B

4. Quick Check:

   Use "$prefix$i" to join strings in bash [OK]

Hint: Use "$prefix$i" to join variable and number in bash [OK]

Common Mistakes:

• Using + for string concat in bash
• Not quoting variable expansions
• Writing variable names without $ sign