Simple if/else expressions (1/2)

Okay, now we are familiar with conditional operators and know how to deal with them. It means now we can divide our code into pieces depend on the condition. In Python, its implemented like the follows:


              1234
            
if condition:
   do if true
else
   do if not true

For example, remember our primitive example about deciding whether to go walk or not. We can write it in Python syntax like that:


              1234
            
if (weather is good and (day is Sunday or day is Saturday)):
   go walk
else:
   stay home :(

Consider some examples: imagine you have some string and want to check if it's wide. Let's call string wide if it has more than 20 symbols.


              1234567891011121314151617
            
# assign some variable
test = "small string"

# conditional statement
if(len(test) > 20):
    print("This string is wide!")
else:
    print("Nothing special")
    
# check on different string
test = "This string is very-very and very large"

# conditional statement
if(len(test) > 20):
    print("This string is wide!")
else:
    print("Nothing special")

Please note, that code blocks written below if, else statements need to be indented on the same level (2 spaces, 3, 4, ...). The main condition - the equal number.

Assume you own a small grocery and spend 2000 dollars every day. Obviously, if your revenue per day is less than 2000, then you suffer losses, otherwise - nothing bad. Let's try to write if/else statement for that.

Opgave

Swipe to start coding

Write conditional statement checking if variable revenue is less than 2000 (in that case print message "We suffer losses!", otherwise - print "Everything is ok!"). Do not change value of revenue.

Løsning

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Sektion 4. Kapitel 3

Simple if/else expressions (1/2)


              1234
            
if condition:
   do if true
else
   do if not true

For example, remember our primitive example about deciding whether to go walk or not. We can write it in Python syntax like that:


              1234
            
if (weather is good and (day is Sunday or day is Saturday)):
   go walk
else:
   stay home :(

Consider some examples: imagine you have some string and want to check if it's wide. Let's call string wide if it has more than 20 symbols.


              1234567891011121314151617
            
# assign some variable
test = "small string"

# conditional statement
if(len(test) > 20):
    print("This string is wide!")
else:
    print("Nothing special")
    
# check on different string
test = "This string is very-very and very large"

# conditional statement
if(len(test) > 20):
    print("This string is wide!")
else:
    print("Nothing special")

Please note, that code blocks written below if, else statements need to be indented on the same level (2 spaces, 3, 4, ...). The main condition - the equal number.

Opgave

Swipe to start coding

Løsning

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder

Var alt klart?

Tak for dine kommentarer!

Sektion 4. Kapitel 3

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder