878196. Learn to Comment - Python
Basic
Learn to Comment - Python
Summary
The problem "Learn to Comment" is a basic programming task that focuses on commenting code in Python. The goal is to write Python code that prints out comments from a given string.
Detailed Explanation
The approach to this problem is straightforward: iterate through the input string and identify comment lines (i.e., lines starting with #). For each comment line, extract the text after the # symbol and print it out. Here's a step-by-step breakdown of the solution:
- Initialize an empty string
resultto store the extracted comments. - Iterate through each line in the input string using a loop (e.g.,
for line in input_string.split('\n'):). - Check if the current line is a comment by checking if it starts with
#. If it does, proceed to step 4. Otherwise, skip to the next iteration. - Extract the text after the
#symbol using string manipulation (e.g.,comment = line.split('#')[1].strip()). This will give us the actual comment text. - Append the extracted comment text to the
resultstring.
Time complexity: O(n), where n is the length of the input string, since we're iterating through each line once. Space complexity: O(1), as we only need a constant amount of space to store the result and temporary variables.
Optimized Solutions
Python
public class LearnToComment {
public static String learnToComment(String inputString) {
StringBuilder result = new StringBuilder();
for (String line : inputString.split("\n")) {
if (line.startsWith("#")) {
int commentStart = line.indexOf('#') + 1;
result.append(line.substring(commentStart).trim()).append('\n');
}
}
return result.toString().trim();
}
public static void main(String[] args) {
String inputString = "Hello #world, this is a test #comments!";
System.out.println(learnToComment(inputString));
}
}