Python starters

tip

Python eggs for starters.

First off, let's take a quick look how are these three languages different from each other.

JavaScript

function helloWorld() {
  console.log('Hello, world!');
}

Python

msg = ("Hello, world!")
print(msg)

Java

class HelloWorld {
  public static void main(String args[]) {
    System.out.println("Hello, World");
  }
}

Yes! they may be different however, the same principles can be applied.

Let's begin

1. Here are two different examples that prints the same output.

var1

print("Hello, world!")

var2

msg = ("Hello, world!")
print(msg)

Show output 👉

Hello, world!

For statements

words = ["cat", "dog", "monkey"]

for w in words:
    print(w, len(w))

Show output 👉

cat 3
dog 3
monkey 6

a = ['Mary', 'had', 'a', 'little', 'lamb']

for i in range(len(a)):

    print(i, a[i])

Show output 👉

1 had
2 a
3 little
4 lamb

for n in range(2, 10):
    for x in range(2, n):
        if n % x == 0:
            print(n, 'equals', x, '*', n//x)
            break
    else:
        # loop fell through without finding a factor
        print(n, 'is a prime number')

Show output 👉

3 is a prime number
4 equals 2 * 2
5 is a prime number
6 equals 2 * 3
7 is a prime number
8 equals 2 * 4
9 equals 3 * 3

for num in range(2, 10):

    if num % 2 == 0:
        print("Found an even number", num)
        continue

    print("Found an odd number", num)

Show output 👉

Found an even number 2
Found an odd number 3
Found an even number 4
Found an odd number 5
Found an even number 6
Found an odd number 7
Found an even number 8
Found an odd number 9

a = []

for x in range(1,11):
    b = x**2
    a.append(b)

    print(a)

Show output 👉

[1]
[1, 4]
[1, 4, 9]
[1, 4, 9, 16]
[1, 4, 9, 16, 25]
[1, 4, 9, 16, 25, 36]
[1, 4, 9, 16, 25, 36, 49]
[1, 4, 9, 16, 25, 36, 49, 64]
[1, 4, 9, 16, 25, 36, 49, 64, 81]
[1, 4, 9, 16, 25, 36, 49, 64, 81, 100]

Array

def print_triangle(height):
    for i in range(1, height + 1):
        print(' ' * (height - i) + '*' * (2 * i - 1))

# Example usage
print_triangle(5 * 2)

Show output 👉

         *
        ***
       *****
      *******
     *********
    ***********
   *************
  ***************
 *****************
*******************