Course Content

Learn Python from Scratch

1. The basics

Hello, World!Hello, me!Variables Comments Indentation Numbers and strings

2. Arithmetic operations

Addition Multiplication and power Division and whole part division

3. Common data types

Data types Numbers float and int Storing text Strings slicing Concatenation

4. Conditional statements

Boolean data type Combining conditions Simple if/else expressions (1/2)Simple if/else expressions (2/2)If/else expressions with multiple conditions (1/2)If/else expressions with multiple conditions (2/2)

5. Other data types

Lists (1/3)Lists (2/3)Lists (3/3)Tuples (1/3)Tuples (2/3)Tuples (3/3)Dictionaries (1/2)Dictionaries (2/2)

6. Loops

while loop (1/2)while loop (2/2)for loop (1/5)for loop (2/5)for loop (3/5)for loop (4/5)for loop (5/5)

7. Functions

Built-in functions Writing your own functions (1/5)Writing your own functions (2/5)Writing your own functions (3/5)Writing your own functions (4/5)Writing your own functions (5/5)lambda functions

If/else expressions with multiple conditions (1/2)

In the last example, you might notice that we didn't consider the case when revenue is exactly 2000. In that case, we suffer no losses, but at the same time have no profit. Surely there should be a way to modify our code to predict such things.

If you want to check one more condition after you've done another one, use elif. It looks like follows:


              123456
            
if condition1:
    do something
elif condition2:
    do another
else:
    do nothing

A piece of code after the last else will be executed only when all the conditions above don't hold.

For example, remember our last example with string length. Let's modify it a bit and now let's call string large if it has more than 20 symbols, medium - if more than 10 (but surely less than 20), and small otherwise.


              123456789101112131415161718192021
            
# assign some medium string
test = "medium string"

# conditional statements
if len(test) > 20:
    print("String: '", test, "' is large")
elif len(test) > 10:
    print("String: '", test, "' is medium")
else:
    print("String: '", test, "' is small")
    
# one more checking
test = "small"

# conditional statement
if len(test) > 20:
    print("String: '", test, "' is large")
elif len(test) > 10:
    print("String: '", test, "' is medium")
else:
    print("String: '", test, "' is small")

Task

Modify your code (from exercise about the small store) so if revenue will be exactly 2000 you will receive the message "We are in balance".

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 4. Chapter 5

If/else expressions with multiple conditions (1/2)

If you want to check one more condition after you've done another one, use elif. It looks like follows:


              123456
            
if condition1:
    do something
elif condition2:
    do another
else:
    do nothing

A piece of code after the last else will be executed only when all the conditions above don't hold.


              123456789101112131415161718192021
            
# assign some medium string
test = "medium string"

# conditional statements
if len(test) > 20:
    print("String: '", test, "' is large")
elif len(test) > 10:
    print("String: '", test, "' is medium")
else:
    print("String: '", test, "' is small")
    
# one more checking
test = "small"

# conditional statement
if len(test) > 20:
    print("String: '", test, "' is large")
elif len(test) > 10:
    print("String: '", test, "' is medium")
else:
    print("String: '", test, "' is small")

Task

Modify your code (from exercise about the small store) so if revenue will be exactly 2000 you will receive the message "We are in balance".

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 4. Chapter 5

If/else expressions with multiple conditions (1/2)

If you want to check one more condition after you've done another one, use elif. It looks like follows:


              123456
            
if condition1:
    do something
elif condition2:
    do another
else:
    do nothing

A piece of code after the last else will be executed only when all the conditions above don't hold.


              123456789101112131415161718192021
            
# assign some medium string
test = "medium string"

# conditional statements
if len(test) > 20:
    print("String: '", test, "' is large")
elif len(test) > 10:
    print("String: '", test, "' is medium")
else:
    print("String: '", test, "' is small")
    
# one more checking
test = "small"

# conditional statement
if len(test) > 20:
    print("String: '", test, "' is large")
elif len(test) > 10:
    print("String: '", test, "' is medium")
else:
    print("String: '", test, "' is small")

Task

Modify your code (from exercise about the small store) so if revenue will be exactly 2000 you will receive the message "We are in balance".

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

If you want to check one more condition after you've done another one, use elif. It looks like follows:


              123456
            
if condition1:
    do something
elif condition2:
    do another
else:
    do nothing

A piece of code after the last else will be executed only when all the conditions above don't hold.


              123456789101112131415161718192021
            
# assign some medium string
test = "medium string"

# conditional statements
if len(test) > 20:
    print("String: '", test, "' is large")
elif len(test) > 10:
    print("String: '", test, "' is medium")
else:
    print("String: '", test, "' is small")
    
# one more checking
test = "small"

# conditional statement
if len(test) > 20:
    print("String: '", test, "' is large")
elif len(test) > 10:
    print("String: '", test, "' is medium")
else:
    print("String: '", test, "' is small")

Task

Modify your code (from exercise about the small store) so if revenue will be exactly 2000 you will receive the message "We are in balance".

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Section 4. Chapter 5

Switch to desktop for real-world practiceContinue from where you are using one of the options below