How to Write Python If Statement

In Python, the ‘If’ statement is a prominent conditional loop statement that may be regarded as an entry-level conditional loop in which the condition is stated first before running the function.

Python does not have an incremental factor in its syntax, unlike other object-oriented programming languages’ ‘if’ statements. When the condition in the ‘if’ statement is fulfilled, it is used to print or conduct a certain action. It uses only the keyword ‘if’ as the keyword included straight from the statement syntax.

The Boolean criteria “True” and “False” are used in the “if” expression. When a given “if” condition is True, a given block of code passes, and when a particular condition is false, it will not pass or be executed.

Simple mathematical conditions like Not Equal (! =), Less than or equal to (<=), Less than (), Greater than or equal to (>=), Greater than (>), Equal (=) can also be used with the “if” condition.

How Does the If Statement Work?

The “if” statement is generally used to regulate the program’s path. It is used to avoid executing certain outcomes that we do not want to perform.

The fundamental format of a python “if” statement is to type “if” (lower case), then the condition with a colon at the conclusion of the “if” statement, and finally a print statement to display our desired result. Because Python is case-sensitive, “if” should be written in lower case.

If Syntax in Python

In Python programming, the if statement has a very straightforward structure:

Python If Statement

When the Python test condition is met, Statement1, Statement2, down to Statementn will be executed if the statement is true. Otherwise, they will all skip. For a better understanding, let’s take some examples.

Example of a Python if statement

An if statement is demonstrated in the example below.

x is typed by the user (an integer). It is only displayed if the value is larger than zero.

Python If Statement example

The output of the program is shown below:

Python If Statement output

Nothing is displayed if you enter 0 or lower:

Python If Statement

Example 2 of a Python If Statement

We’ll show you what goes on with the code outside the If block in this particular Python if statement example.

Python If Statement example

The code for this Python “If statement” is identical to the code we used in the previous example. We did, however, add one additional print just outside of the If block with a text this time.

We typed 25, which indicates that the condition is TRUE. As a result, the print function is displayed both within and outside the If statement.

Let’s try inserting 0 to make the condition fail on purpose. The compiler outputs nothing from the If condition block even if the condition failed here (because the number is less than 1). As a result, it only produced one print statement outside the block.

If else Statement

The else phrase can be used in conjunction with the if statement. If <expression> is False, the code right after else is the only part that’ll be performed.

If else Statement

elif clause

Then there’s the elif clause. “Else If” is the long form of the phrase. This allows you to verify each condition individually.

elif clause

Any value can be added to the equation. Multiple criteria are checked in this example:

If else multiple criteria

Entering anything within the “else” block will print out the word “Hi”. If other names are contained within the “if” and “elif” blocks, then the respective names are printed.

Nested if statements

If statements can indeed be nestled inside other if statements. A nested if structure is what it’s called.

As a rule of thumb, you should not repeat this process more than twice since it becomes quite difficult to read.

The syntax is as follows:

Nested if statements

The if statement below, for example, is nested:

Nested if statements example

Since they are within the second if statement, the nested statements ought to have 8 spaces. Within a nested “if” expression, you may still use “elif” and “else”.

Nested if statements

Using “if” statements for multiple conditions

What if you wish to have a number of different conditions? If you can type a number of if statements like this, that’s one approach to deal with it:

Using “if” statements for multiple conditions

However, this generates spaghetti code, which is difficult to comprehend and may become confusing fast. The elif and else keywords are what you want to employ.

These programs will do the same thing, but the above approach is recommended since it is easier to understand and maintain.

Finally, the “if” statement in Python is being used when it is necessary to determine which statements or actions should be executed and which should be skipped prior to execution. True or false logic is used in the execution. In python “if” statements, you may use any mathematical or logical operator.

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