![]() ![]() Once completed continue with the next exercise. If the number is out of range the program should display "invalid number". Make a program that asks the number between 1 and 10\. If you are a beginner, then I highly recommend this book. string1 'Hello' string2 'Hello' if string1 string2: print('Both strings are not equal') return if true else: print('Both strings are equal') return if false Both strings are equal We're using the same example but with a different operator. 1īut comes down to the same thing, the only difference is the syntax (and readablity). This is a more elegant and Pythonic than to write a list of if-statements as shown below. When comparing age (age = 5), the opposite. It also makes use of the else keyword, this is the other evaluation case. You can convert the string to an integer using int(). The second string is typed, but we need a number. It has several if statements, that are evaluated based on the keyboard input.īecause keyboard input is used, we use the equality sign (=) for string comparison. You can use if statements to make an interactive program. Visual example of if statement (click to enlarge): There are two indented blocks: One, like in the simple if statement, comes right after the if heading and is executed when the condition in the if heading is. The if statement ends by its indetion, it goes back four spaces. This article explains those conditions with plenty of examples. Here’s an example: age 22 See if the person is 18 or not if age 18: print ('Youre old enough to drive') else: print ('You may be too young to drive, '+ 'or already older than 18. Pythons if statements can compare values for equal, not equal, bigger and smaller than. 1Īfter completing the if statement, Python continues execution of the program. If/else statement example When an if/else statement tests for equality, there’s also a code path that runs when the tested tested values are not the same. A block is seen by Python as a single entity, that means that if the condition is true, the whole block is executed (every statement). The example below shows a code block with 3 statements (print). Indentation and BlocksĪn if statement doesn’t need to have a single statement, it can have a block. More than one condition can be combined using the and keyword. ![]() It’s very important to have four spaces for the statements. Several examples of the if statements are shown below, you can run them in the Python interpreter: 1 ![]() Each of those lines must indented with four spaces. is the condition evaluated as a Boolean, it can either be True or False.The if statement may be combined with certain operator such as equality (=), greater than (>=), smaller than (: ( A control structure controls the flow of the program.) An if statement is one of the control structures. In Python the if statement is used for conditional execution or branching. These choices can execute different code depending on certain condition. A program sometimes may have to make choices. ![]()
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