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PYTHON - LISTS

A 'List' is a Collection that holds multiple values, of different Data Types. And in a 'List' the elements are ordered (We will explain it soon), the values are changeable and allows duplicate values.

The declaration of a 'List' 'Data Type' is super easy. You can place multiple values inside square brackets '[ ]' and Python will understand that it is a 'List'.

Creating a 'List' with values of different Data Types

Example :

x = [5, "John", "Python"]
print(x)

Output :

[5, 'John', 'Python']

So, in the above code we have created a 'List' using square brackets '[ ]'.

And put an Integer type value (i.e. 5) and two String type value (i.e. 'John' and 'Python')

x = [5, "John", "Python"]

And initialised to the variable 'x'.

So, we can see that two different data types are assigned to a 'List'.

In the next line we have printed the 'List' using the print statement.

print(x)

Now, if we see the output,

Output :

[5, 'John', 'Python']

Iterating a List using 'for loop'

Example :

x = [5, "John", "Python"]
for i in x:
    print(i)

Output :

5
John
Python

Similarly, in the above code we have created a 'List' using square brackets '[ ]'.

x = [5, "John", "Python"]

And initialised to the variable 'x'.

In the next line we have used the 'for loop' to Iterate through the 'List'.

for i in x:
    print(i)

Now, if we see the iterations of for loop,

for i in x:

1st Iteration

In the first Iteration the first value of the 'List' 'x' (i.e. 5) is taken and put into the variable 'i'.

And the print statement, prints the value of 'i'.

Output :

2nd Iteration

Similarly, in the second Iteration the second value of the 'List' 'x' (i.e. 'John') is taken and put into the variable 'i'.

And the print statement, prints the value of 'i'.

Output :

5
John

3rd Iteration

Similarly, in the third Iteration the third value of the 'List' 'x' (i.e. 'Python') is taken and put into the variable 'i'.

And the print statement, prints the value of 'i'.

Output :

5
John
Python

Now, if you see the final output. You can find that the values of the 'List' are displayed in the same way they were inserted.

i.e. First '5' is printed, then the name 'John' and finally 'Python' is printed.

And if you see the List,

x = [5, "John", "Python"]

It is printed in the same order it was inserted. And this is why a List is said to be 'Ordered'.

Next, let us see, how to access the elements of the List in the next tutorial.

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