for loop lab

For Loop Iterations (List | String | Tuple | Set)

Section 1 — List Iteration

Exercise 1.1 — Print All Services

Scenario: You’re writing a simple script to print all running services. Starter Code:

services = ["nginx", "redis", "postgres"]

# YOUR CODE HERE
# Print each service on a separate line

Expected Output:

nginx
redis
postgres

Exercise 1.2 — Build a New List (Uppercase)

Scenario: You want to normalize service names to uppercase. Starter Code:

services = ["nginx", "redis", "postgres"]
upper_services = []

# YOUR CODE HERE
# Loop and add each service in uppercase into upper_services

print(upper_services)

Expected Output:

['NGINX', 'REDIS', 'POSTGRES']

Exercise 1.3 — Count Values Above a Threshold

Scenario: You want to count how many servers have CPU usage above 75. Starter Code:

cpu_usage = [12, 88, 76, 45, 90, 75, 77]
threshold = 75
count = 0

# YOUR CODE HERE
# Count how many items are strictly greater than threshold

print(count)

Expected Output:

4

Section 2 — String Iteration

Exercise 2.1 — Count a Character

Scenario: You want to count how many times the letter e appears in a log message. Starter Code:

log_line = "joey doesnt share food, how you doin'?"


# YOUR CODE HERE
# Count how many times target appears in log_line

print()

Expected Output:

3

Exercise 2.2 — Extract Only Letters

Scenario: You received a message that contains spaces and symbols. You want a new string with only letters. Starter Code:

msg = "DevSecOps-22!!!"
letters = ""

# YOUR CODE HERE
# Build a new string containing only alphabetic characters

print(letters)

Expected Output:

DevSecOps

Section 3 — Tuple Iteration

Exercise 3.1 — Validate Allowed Environments

Scenario: Only certain environments are allowed. Starter Code:

allowed_envs = ("dev", "staging", "prod")
user_env = "prod"
is_allowed = False

# YOUR CODE HERE
# Loop over allowed_envs and set is_allowed to True if user_env exists

print(is_allowed)

Expected Output:

True

Exercise 3.2 — Find the Longest Word

Scenario: You want to find the longest string in a tuple. Starter Code:

words = ("dev", "security", "ops", "automation")
longest = ""

# YOUR CODE HERE
# Find the longest word and store it in longest

print(longest)

Expected Output:

automation

Section 4 — Set Iteration

Exercise 4.1 — Print Unique Ports

Scenario: You want to check unique ports that appear in a scan result. Starter Code:

ports = {22, 80, 443, 80, 22}

# YOUR CODE HERE
# Print each port on a separate line

Expected Output (order can be different):

22
80
443

Exercise 4.2 — Classify Secure vs Not Secure

Scenario: Mark port 443 as secure and all other ports as not secure. Starter Code:

ports = {22, 80, 443}

# YOUR CODE HERE
# For each port:
# - if it is 443 print "secure"
# - else print "not secure"

Expected Output (order can be different):

not secure
not secure
secure