Python Problems l

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★ Profiles ★

IrisValDev | Codewars

Iris06 | LeetCode

irisvalgb | HackerRank

✰ღ★ღ Squaring an Argument ღ★ღ✰

Write a function that takes an argument and returns the square of it.

★ Problem Breakdown ★

The function needs to take an argument and return the square.

The square of a number is the result of multiplying that number by itself. For example:

★ Flowchart ★

★ Code ★

We take the argument and multiply it by itself:

✰ღ★ღ Even or Odd ღ★ღ✰

Create a function that takes an integer as an argument and returns "Even" for even numbers or "Odd" for odd numbers.

★ Problem Breakdown ★

The function needs to take an integer as input.

The function must check if the number is even or odd.

The function must return “Even” if the number is even or “Odd” if it’s odd.

💡

In python, we can use the % operator that calculates the remainder of a division.

Even and Odd numbers:

An even number is divisible by 2 without a remainder (2, 4, 6, ...).

An odd number leaves a remainder of 1 when divided by 2 (1, 3, 5, ...).

★ Flowchart ★

★ Code ★

We can use an if/else statement for checking whether a number is even or odd:

A more concise way to write this is using a ternary conditional:

✰ღ★ღ Counting sheep ღ★ღ✰

Consider an array/list of sheep where some sheep may be missing from their place. We need a function that counts the number of sheep present in the array (true means present). For example:

🔍

Hint: Don't forget to check for bad values like null/undefined.

★ Problem Breakdown ★

The problem has an array that contains True or False values.

The function needs to count the number of sheep present in the array.

True means present.

💡

In python, we can use the count() method or we can iterate through each element in the array.

★ Flowchart ★

Flowchart iterating:

🔍

The .count() method functions for itself, so doesn’t require a flowchart.

★ Code ★

We call the .count() method, passing the argument “True” which counts the occurrences of the True value in the list:

First, we initialize a counter at 0, then iterate through the list, incrementing it (count += 1) for each True value.

💡

The reason we use if sheep instead of if sheep == True is that Python checks whether the value of sheep is 'truthy'. This is equivalent to writing if sheep == True, but it's shorter and cleaner.