Class 1 of Module 2 - Strings

1. PYTHON
Module 2

2. Strings
• It’s a series of characters (or numerals).
• Must be entered at the command prompt or in the
code within quotes.

3. Upper Command
• Upper command changes the case of the string
from lower to UPPER case as follows:

4. Examples for lower
• Upper command changes the case of the
string from UPPER to lower case as follows:

5. Capitalize()
• Capitalize() command changes the case of
only the 1st
letter of the string to UPPER to
lower case.
• Changes the first alphabet regardless of the
string regardless of the entire string’s case.

6. Examples for Capitalize()
• Changes the first alphabet regardless of the
string regardless of the entire string’s case.

7. Swapcase()
• Reverses the entire string’s individual
alphabet’s case.

8. enumerate()
• Lists the entire string’s elements one by one, along
with its index
• Does not work on its own
• Works along with the list command

9. Index
• Index is the numerical position of the alphabet inside
a string or the position of any element in a list.
• Helps us access a certain alphabet/character within a
string.

10. String - Length
• The length of a string shows the number of elements
present within it (including quotes).
• len command

11. Indexing & String length
• Indexing of a string(or list) starts with 0.
• Reason.
• To access the last element of a string, we must type…
• string_name[len – 1]

12. Example

13. ‘+’ ve & ‘-’ve indices
• When a ‘+’ve index (starting with 0) is entered, it counts the
position of string element from L to R and returns the
corresponding alphabet.

14. ‘+’ ve & ‘-’ve indices
• When a ‘-’ve index (starting with 1) is entered, it counts the
position of string element from R to L and returns the
corresponding alphabet.

15. Traversal
• It is the process of going from the very first element
of the string to its last element.
• Traversal can be done using while statement as
follows:

16. Example

17. Result

18. For Loop