The capacity to settle on a choice, whether to take somehow, is an essential element of performing helpful work. Client or anything can give data and accomplishing something helpful with that data relies on upon the choice. With no choice on the data (information) the computer will stay pointless.

Decision Making is each day piece of our life. When we get so whether to have breakfast or not, when we see a red flag light , we compare the red light with the fancied green light, decide that the light isn't green, and then stop. The vast majority of us needn't bother with time to prepare the choice since we utilize it quite often.

We utilize if Statement every day, for e.g. , in the event that I am late for work then I won’t have breakfast this is the type of the IF Statement we use in our everyday life

Let's assume we make a variable, Case, and place a value of 9 in it, similar to this:

Example= 9

You can then approach the PC to check for an estimation of 9 in Illustration, similar to this:

if Example == 9:

print("Example is equivalent as 9!")

Each Python if Statement starts, with the word if. At the point when Python checks whether, it realizes that we need it to settle on a decision. After the word if comes a condition. A condition just states which sort of comparison we need Python to make. For this situation, you need Python to figure out if

Illustration contains the value 9.

See that the condition utilizes the relational equality operators, "==", and not the assignment operator,"=". A typical mistake that designers make is to utilize the assignment operator rather than the equality operator.

The conditions closes with a colon (:). In the event that we don't give a colon, Python won't realize that the condition has finished and will keep on looking for extra conditions on which to base its choice. After the colon come any errands or task you need Python to perform.

In the event that the suite of an if condition comprises just of a single line, it might go on a same line from the header statement.

Here is a case of a one-line if condition −

#!/usr/bin/python

var = 50

if( var == 50 ) :

print "Estimation of expression is 50"

print "Farewell!"

At the point when the above code is executed, it delivers the accompanying outcome −

Estimation of expression is 50

Farewell!

Frequently we have to make different decisions with record for numerous requirement.

For instance, when baking cookies, if the clock has gone off and it has turned brown, it's an ideal opportunity to take it out from the oven.

To make multiple comparisons, you make various conditions utilizing relational operators and combine them using logical operators. A logical operator portrays how to consolidate conditions. For instance, you may state x == 6 and y == 7 as two conditions for performing at least one errands. The ‘and’ keyword is a logical operator that expresses that both conditions must be valid. A standout amongst the most widely recognized uses for making multiple comparisons with decide when a value is inside a specific range. Indeed, range checking, the demonstration of figuring out if information is between two values, is a critical piece of making your application secure and easy to understand. The accompanying steps help you perceive how to play out this task. For this situation, you make a document with the goal that you can run the application under various circumstances.

1. Open a Python Document window.

You see an editor in which you can type the illustration code.

2. Sort the following code into the window — squeezing Enter after every line:

value = int(input("Type a number somewhere around 1 and 10: "))

if (Value > 0) and (Value <= 10):

print("You wrote: ", Value)

This case starts by acquiring an information value from the user. You have no clue what the client has written other than that it's a value of some type. The utilization of the int () work implies that the client must type an entire number (one without a decimal part). Something else, the application will raise an exception (we will find out about the errors and exception later on). This first check guarantees that the info is in any event of the right type.

The if statement contains two conditions. The primary expresses that Value must be more than 0. You could likewise display this condition as Value >= 1. The second condition expresses that Value must be less than 10. Just when Value meets both of these conditions, the if statement will succeed and print the value the client wrote.

3. Pick Run➪Run Module.

You see a Python Shell window open with prompt to type a number somewhere around 1 and 10.

4. Type 6 and press Enter.

The application verifies that the number is in the correct range and provides output

5. Repeat Steps 3 and 4, yet type 33 rather than 6.

The application doesn't provide output anything in light of the fact that the number is in the wrong range. At whatever point you write a value that is outside the programmed range, the statements that are part of the if block aren’t executed.

6. Repeat Steps 3 and 4, yet sort 8.5 rather than 6.

Python shows the blunder message Despite the fact that you may consider 5.5 and 5 as both being numbers, Python sees the primary number as a float point value and the second as a whole number.

7. Rehash Steps 3 and 4, yet sort Hi rather than 6.

Python shows about a similar mistake message as some time recently. Python doesn't separate between sorts of wrong information. It just realizes that the information sort is incorrect and unusable.

With Python, we pick one of two options utilizing the else condition of the ‘if Statement’. A clause is an expansion to a code block that alters the path in which it works. Most code blocks support various clauses. For this situation, the else clause empowers you to play out an optional assignment, which increases the usefulness of the if statement. Most designers refer to the type of the ‘if statement’ that has the else condition included as the if...else statement. Here and there designers experience issues with the if...else statement since they overlook that the else clause always executes when the conditions for the if statement aren’t met. It’s important to think about the consequences of always executing a set of tasks when the conditions are false. Sometimes doing so can lead to unintended consequences.

1. Open a Python File window.

You see an editor in which you can type the illustration code.

2. Type the accompanying code into the window — squeezing Enter after every line:

Value = int (input ("Sort a number somewhere around 1 and 10: "))

if (Value > 0) and (Value <= 10):

print ("You wrote: ", Value)

else:

print("The value you wrote is erroneous!")

As some time recently, the illustration gets contribution from the client and afterward figures out if that info is in the right range. Nonetheless, for this situation, the else clause gives an option to provide message when the client enters information outside the wanted range.

See that the else clause closes with a colon, similarly as the if statement does. Most conditions that you use with Python statements have a colon connected with them so Python knows when the clause has finished. On the off chance that you get a coding error for your application, ensure that you check for the nearness of the colon as required.

3. Pick Run➪Run Module.

You see a Python Shell window open with prompt to type a number somewhere around 1 and 10.

4. Type 5 and press Enter.

The application discovers that the number is in the correct range and provides output

5. Repeat Steps 3 and 4, yet type 22 rather than 5.

This time the application yields a blunder message. The client now realizes that the value is outside the desired range and knows to try entering it again