# 计算机代写|python代考|A Simple Example

## 计算机代写|python代考|Checking for Equality

At the heart of every if statement is an expression that can be evaluated as True or False and is called a conditional test. Python uses the values True and False to decide whether the code in an if statement should be executed. If a conditional test evaluates to True, Python executes the code following the if statement. If the test evaluates to False, Python ignores the code following the if statement.

The first line sets the value of car to ‘bmw’ using a single equal sign, as you’ve seen many times already. The next line checks whether the value of car is ‘bmw’ by using a double equal sign $(==)$. This equality operator returns True if the values on the left and right side of the operator match, and False if they don’t match. The values in this example match, so Python returns True.
When the value of car is anything other than ‘bmw’, this test returns False:
$\gg \gg$ car $=$ ‘audi’
$\gg \gg>\mathrm{car}=\mathrm{s}^{\prime \prime} \mathrm{bmw}$ ‘
False
A single equal sign is really a statement; you might read the first line of code here as “Set the value of car equal to ‘audi’.” On the other hand, a double equal sign asks a question: “Is the value of car equal to ‘brw’ ?” Most programming languages use equal signs in this way.

We first assign the capitalized string ‘Audi’ to the variable car. Then, we convert the value of car to lowercase and compare the lowercase value to the string ‘audi’. The two strings match, so Python returns True. We can see that the value stored in car has not been affected by the lower() method.
Websites enforce certain rules for the data that users enter in a manner similar to this. For example, a site might use a conditional test like this to ensure that every user has a truly unique username, not just a variation on the capitalization of another person’s username. When someone submits a new username, that new username is converted to lowercase and compared to the lowercase versions of all existing usernames. During this check, a username like ‘John’ will be rejected if any variation of ‘john’ is already in use.

## 计算机代写|python代考|Checking for Inequality

When you want to determine whether two values are not equal, you can use the inequality operator $(!=)$. Let’s use another if statement to examine how to use the inequality operator. We’ll store a requested pizza topping in a variable and then print a message if the person did not order anchovies:

This code compares the value of requested_topping to the value ‘anchovies’. If these two values do not match, Python returns True and executes the code following the if statement. If the two values match, Python returns False and does not run the code following the if statement.

Because the value of requested_topping is not ‘anchovies’, the print() function is executed: Most of the conditional expressions you write will test for equality, but sometimes you’ll find it more efficient to test for inequality.

You may want to check multiple conditions at the same time. For example, sometimes you might need two conditions to be True to take an action. Other times, you might be satisfied with just one condition being True. The keywords and and or can help you in these situations.

# python代考

≫≫车=’奥迪’
>>>>C一个r=秒′′b米在’
False

## 计算机代写|python代考|Checking for Inequality

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