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You will need to convert the value of the input string to a numerical form if you want to accept numerical data. All input is initially stored as a string data type. You can use the input statement to allow your users to enter the data which we can check using the if statement. Using = input('What program are you using? ') To test whether a certain value is in a list, you can use the in keyword.
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Print("Thank God we have no cats!") Thank God we have no cats! Conditional tests with lists Print("Eat some vegetables!") Eat some vegetables! Test whether a list is empty cats = Check if a value is not included in a list foods = The if statement is quite useful in combination with lists. Print('Don't Go!') if-elif-else statement color = 'Green' Print('Go!') if-else statement color = 'Orange' So you may use if, if-else, if-elif, or if-elif-else chains. Your choice of which to use depends on how many conditions you need to test. There are a few kinds of if statements to be aware of. Sandwich.lower() = 'ham' True Checking for inequality vegetable = 'potato' Language = 'python' False Ignoring case when making a comparison sandwich = 'Ham' Language = 'python' True language = 'javascript' This is not to be confused with the assignment operator which is a single equal sign, and assigns a value to a variable. Checking for equalityĪ double equal sign ( =) checks whether two values are equal.
#Color war tkinter code#
Python uses the True and False values to evaluate whether the code should be executed in an if statement.
#Color war tkinter how to#
In this tutorial, we’ll take a look at conditional tests, if, if-else, if-elif-else, and how to use conditional checks in loops.Īn expression that can be tested as True or False is a conditional check. If statements are used for conditional tests, checking user input, numerical comparison, multi-condition checks, boolean values, and so on. Python keeps it simple and sticks with the if statement only. Some other languages offer a switch, or case, statement for these. You can write a basic if statement that checks one condition, or you can create a series of if statements that identify the exact conditions you’re looking for. The Python if statement allows you to investigate the current state of a program and respond accordingly to that state.