Python Basics: Part 2

1. New data types.

a. Bool

b. List []

Declaration

Indexing slicing stepping

Nested list. List inside a list as an element

Accessing elements inside a nested list

List concatenation

Concatenation only occurs when both variables have same data-type.

List multiplication

List mutability

1. Tuples ()

   Declaration

   Indexing, slicing

   Mutability and Immutability

   Tuple concatenation

   Multiplication

   Typecasting from tuple to list and vice-versa

2. Finding length using len() function

3. Set {}

Declaration

Is set doing sorting?

Make a set with duplicate values and see the output

Indexing, slicing

Typecast a list to set

• Set to list

• Nested list to set

• Tuple to set

• Set to tuple

Set does not allow indexing because order or input and order or output is different.

1. Dictionary {}

   A key-value pair

   Declare a dictionary

# there should not be duplicate keys, as only latest will be taken 
# key is like a index and there cannot be repeated index
# key should always be unique

Try different Key data-type values

Try different "value" data type values

Indexing, Slicing

1. Exploring In-built function: Strings

   a. Declare a string eg. a = "Name"

   b. Call the variable add a dot next to it and press the tab key on the keyboard above the capslock key. Eg. a. # press_tab_key

   c. All inbuilt functions that Python has for the string will show in a drop-down form.

   d. Try all of them once and play around.

   e. Do try index() , find() , split() and replace() function

Does replace function makes string mutable?

1. Exploring In-built function: List

   a. Declare a List eg. l = [1, 2, 3, 4, 'Aynat', (3+6j), 23.45, True, [1, 2, 3]]

   b. Call the variable add a dot next to it and press the tab key on the keyboard above the capslock key. Eg. l. # press_tab_key

   c. All inbuilt functions that Python has for the list will show in a drop-down form.

   d. Try all of them once and play around.

2. Exploring In-built function: Tuple

   a. Declare a Tuple eg. t = (1, 2, 3, 4, 'Aynat', 'kimlip', (3+5j), True)

   b. Call the variable add a dot next to it and press the tab key on the keyboard above the capslock key. Eg. t. # press_tab_key

   c. All inbuilt functions that Python has for the tuple will show in a drop-down form.

   d. Try all of them once and play around.

3. Exploring In-built function: Set

   a. Declare a set eg. s = {3,4,5,6,6,43,56,54,5,5,5,6}

   b. Call the variable add a dot next to it and press the tab key on the keyboard above the capslock key. Eg. s. # press_tab_key

   c. All inbuilt functions that Python has for the set will show in a drop-down form.

   d. Try all of them once and play around.

4. Exploring In-built function: Dictionary

   a. Declare a dictionary eg. d = {'name': 'ayant', 'subject': ['data science', 'ml', 'ai'], 'number': 1335454}

   b. Call the variable add a dot next to it and press the tab key on the keyboard above the capslock key. Eg. d. # press_tab_key

   c. All inbuilt functions that Python has for the dictionary will show in a drop-down form.

   d. Try all of them once and play around.

Questions

Q.1 Write a Python program that takes a string as input and prints the length of the string.

Q2. Write a program that takes a string as input and checks if it is a palindrome (reads the same forwards and backwards).

Q3. Create a program that takes a string as input and removes all the spaces from it. Print the modified string without spaces.

Q4. Check if a string contains a specific word.

Q5. Count the occurrences of a word in a string.