If not statement in Python
The statement in Python ifchecks a specific condition and executes a block of code if the condition is true.
if notThe does the opposite of ifthe statement. It tests if a condition is false and then executes some statements.
Using if notthe statement can improve the readability of the code, and Falsesome statements can be executed directly for the conditions that return .
The following code will help explain its use.
x = 5
if not x > 10:
print("False")
Output:
False
Since x > 10, Falsethe code is executed.
Similar to ifthe statement, it can have multiple conditions, and we can also use it with elsethe keyword to create if-elseblocks.
if notThe statement can also be used to check whether a data set, such as a list, dictionary, is empty. In Python, if a variable or object is 0 or empty, then it is considered to be false. See the following example.
lst = []
if not lst:
print("Empty")
Output:
Empty
Similarly, its usage can also be extended to other conditions like checking if something is not present in a set. For example, we can use the if notwith inkeyword to execute some statements if an element is not present in a list as shown below.
lst = [1, 2, 3, 5, 6]
if not 4 in lst:
print("All Okay")
else:
print("Not Okay")
Output:
All Okay
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