Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.Lære If/else expressions with multiple conditions (1/2) | Conditional statements
Learn Python from Scratch
course content

Kursusindhold

Learn Python from Scratch

Learn Python from Scratch

1. The basics
Hello, World!Hello, me!VariablesCommentsIndentationNumbers and strings
2. Arithmetic operations
AdditionMultiplication and powerDivision and whole part division
3. Common data types
Data typesNumbersfloat and intStoring textStrings slicingConcatenation
4. Conditional statements
Boolean data typeCombining conditionsSimple 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 functionsWriting 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

book
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
copy

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")
copy
Opgave

Swipe to start coding

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".

Løsning

Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 4. Kapitel 5
toggle bottom row

book
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
copy

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")
copy
Opgave

Swipe to start coding

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".

Løsning

Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 4. Kapitel 5
Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
Vi beklager, at noget gik galt. Hvad skete der?
some-alt