If Elif Else Statements
else structure is a common way to control the flow of a program, allowing you to execute specific blocks of code depending on the value of some data.
If the condition following the keyword
if evaluates as
true, the block of code will execute. Note that parentheses are not used before and after the condition check as in other languages.
if True: print('If block will execute!')
x = 5 if x > 4: print("The condition was true!") #this statement executes
You can optionally add an
else response that will execute if the condition is
if not True: print('If statement will execute!') else: print('Else statement will execute!')
Or you can also see this example:
y = 3 if y > 4: print("I won't print!") #this statement does not execute else: print("The condition wasn't true!") #this statement executes
Note that there is no condition following the
else keyword - it catches all situations where the condition was
Multiple conditions can be checked by including one or more
elif checks after your initial
if statement. Just keep in mind that only one condition will execute:
z = 7 if z > 8: print("I won't print!") #this statement does not execute elif z > 5: print("I will!") #this statement will execute elif z > 6: print("I also won't print!") #this statement does not execute else: print("Neither will I!") #this statement does not execute
Note: only the first condition that evaluates as
true will execute. Even though
z > 6 is
if/elif/else block terminates after the first true condition. This means that an
else will only execute if none of the conditions were
Nested if statements
We can also create nested if’s for decision making. Before preceding please refer to the href=’https://guide.freecodecamp.org/python/code-blocks-and-indentation’ target=’_blank’ rel=‘nofollow’>indentation guide once before preceding.
Let’s take an example of finding a number which is even and also greater than 10
python x = 34 if x % 2 == 0: # this is how you create a comment and now, checking for even. if x > 10: print("This number is even and is greater than 10") else: print("This number is even, but not greater 10") else: print ("The number is not even. So point checking further.")
This was just a simple example for nested if’s. Please feel free to explore more online.
Inline python if-else statement
We can also use if-else statements inline python functions. The following example should check if the number is greater or equal than 50, if yes return True:
python x = 89 is_greater = True if x >= 50 else False print(is_greater)
> True >