If Elif Else Statements

The if/elif/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 statement

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

else statement

You can optionally add an else response that will execute if the condition is false:

if not True:
  print('If statement will execute!')
  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
  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 false

elif statement

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
  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 true, the if/elif/else block terminates after the first true condition. This means that an else will only execute if none of the conditions were true.

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

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")
    print("This number is even, but not greater 10")
  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.

While the examples above are simple, you can create complex conditions using boolean comparisons and boolean operators.

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:

x = 89
is_greater = True if x >= 50 else False




More info on if/elif/else statements: