Programming for Data Science: Lec 5, Branching Statements in Python ('if', 'elif', and 'else')

If-Else Statement Overview:
A branching statement, also known as an If-Else Statement, is a code construct used for conditional execution.
It allows you to execute specific blocks of code only if certain conditions are met.
Logical Conditions:
Conditions in an If-Else Statement are represented as logical expressions.
Logical expressions evaluate to either `True` or `False`.
Syntax of a Simple If Statement:
The indented code block is executed only if the logical expression evaluates to True.
If the logical expression is False, the code block is skipped, and the program moves to the next statement.
```
if logical_expression:
code block
```
Syntax of If-Else Statement:
The indented code block 1 is executed if the logical expression is True.
If the logical expression is False, the indented code block 2 is executed.
```
#datascience #python #machinelearning
if logical_expression:
code block 1
else:
code block 2
```
Extension
The first True condition encountered determines the code block to be executed, and subsequent conditions are not evaluated.
Hence, Python will not check the rest of the statements once it reaches a true statement.
If none of the logical expressions are True, the else block (code block X) is executed.
```
if logical_expression_P:
code block 1
elif logical_expression_Q:
code block 2
elif logical_expression_R:
code block 3
else:
code block X
```