#19 Python Tutorial for Beginners | If Elif Else Statement in Python
Introduction to CPU and Logical Unit
In this video, Ivan introduces the concept of CPU and its three parts: CU, MU, and ALU. He then focuses on the memory unit (MU) and arithmetic unit (AU) of ALU that perform calculations. Later he explains the logical unit of ALU that makes a computer think by applying different conditions.
Understanding Logical Unit
- The logical unit is responsible for making a computer think by applying different conditions.
- As programmers, we write statements to specify the flow of execution based on certain conditions using the special keyword "if".
- We can use "if" to execute one set of statements if a condition is true or another set if it's false.
- The syntax for "if" statement in Python is
if <condition>:, where<condition>can be either true or false.
Working with If Statement
- To execute a block of code under an "if" statement, we need to follow proper indentation rules in Python.
- All statements that belong to an "if" statement should have the same level of indentation. Otherwise, they will not be executed as part of that block.
Overall, this video provides an introduction to CPU and its components while focusing on the logical unit's role in making computers think by applying different conditions. It also explains how we can use "if" statements in Python to specify the flow of execution based on certain conditions while following proper indentation rules.
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Python If Else Statements
In this section, the speaker explains how to use if-else statements in Python. The speaker demonstrates how to improve performance by using else instead of another if statement. They also explain nested if statements and how to use if/elif/else statements.
Using Else Instead of Another If Statement
- To improve performance, use else instead of another if statement when checking for even numbers.
- Use debug and F8 or the flow to see that R is 0 after skipping the else block.
Nested If Statements
- Nested if statements are used when there are conditions that are different from each other.
- Indentation is used to show which print statement belongs to which if statement.
- An entire tree of ifs can be created with nested ifs.
If/Elif/Else Statements
- Use round brackets instead of open brackets for conditions (optional).
- If/elif/else statements can be used when there are multiple conditions with different outputs.
- Each condition is checked in order until one is true, then its corresponding output is printed.
Python For Loops
In this section, the speaker explains how to use for loops in Python. They demonstrate how to loop through a range of numbers and through a string.
Looping Through a Range of Numbers
- Use
for i in range()to loop through a range of numbers.
- The loop will start at the first number specified and end at one less than the second number specified.
- Use
print(i)inside the loop to print each number as it loops through.
Looping Through a String
- Use
for letter in wordto loop through each letter in a string.
- Use
print(letter)inside the loop to print each letter as it loops through.
If, Elif and Else Statements
In this section, the speaker explains how to use if, elif and else statements in Python.
Using Elif Statement
- Elif statement is used when the first condition is false.
- Debugging can be done by putting a breakpoint in the code.
- If the first condition is false, it will jump to Elif statement.
- If none of the conditions match, we can print "wrong input" using else statement.
Conclusion
- Using if, elif and else statements can help us execute different blocks of code based on different conditions.
- The assignment for practicing these concepts will be available at the end of the video.