Programming from zero

Python basics for people who have never written code. Grouped by pattern and tagged by role. Practise each one on LeetCode and tick it off here.

0 / 30 solved

Easy 0/21·Medium 0/9·Hard 0/0

Problem	Difficulty	Practice	Explanation	Solution
Print your first status message	Easy	—	Read	—
Print a server's hostname and IP from variables	Easy	—	Read	—
Swap the active and standby servers	Easy	—	Read	—

Problem	Difficulty	Practice	Explanation	Solution
Build a health check URL	Easy	—	Read	—
Convert disk usage in bytes to GB	Easy	—	Read	—
Normalize a config value	Easy	—	Read	—
Split a log line into its parts	Medium	—	Read	—

Problem	Difficulty	Practice	Explanation	Solution
Alert when a service is stopped	Easy	—	Read	—
Classify CPU usage as OK, warning or critical	Easy	—	Read	—
Decide if a deploy is allowed	Medium	—	Read	—

Problem	Difficulty	Practice	Explanation	Solution
Print every port from 8000 to 8010	Easy	—	Read	—
Count down before a restart	Easy	—	Read	—
Add up disk usage across servers	Easy	—	Read	—
Retry a connection until it succeeds	Medium	—	Read	—

Problem	Difficulty	Practice	Explanation	Solution
Get the first and last server in a list	Easy	—	Read	—
Find the highest response time	Easy	—	Read	—
Filter a list to only web servers	Easy	—	Read	—
Remove duplicate IPs while keeping order	Medium	—	Read	—

Problem	Difficulty	Practice	Explanation	Solution
Read values from a config dictionary	Easy	—	Read	—
Use a default when a config key is missing	Easy	—	Read	—
Count how many servers are in each region	Medium	—	Read	—
Group hosts by health status	Medium	—	Read	—

Problem	Difficulty	Practice	Explanation	Solution
Write is_valid_port(n)	Easy	—	Read	—
Build hostnames with a default environment	Easy	—	Read	—
Format uptime seconds as days, hours, minutes	Medium	—	Read	—

Problem	Difficulty	Practice	Explanation	Solution
Count the lines in a log file	Easy	—	Read	—
Write a server inventory file	Easy	—	Read	—
Extract error lines into a new file	Medium	—	Read	—

Status	Problem	Difficulty	Practice	Explanation	Solution	Save
	Convert a port from text safely	Easy	—	Read	—
	Handle a missing config file without crashing	Medium	—	Read	—

Must-do problem (the last-minute revision list). Company tags appear only where a public interview report names that company.

First stepsRunning Python, printing and variables.0 / 3