Python: Variables and concatenation
Let's try using variables with concatenation. Nothing will change syntactically. We know how to concatenate two lines:
what = "Kings" + "road" print(what) # => Kingsroad
So we're able to glue together a string and one variable in which a string is written:
first = "Kings" what = first + "road" print(what) # => Kingsroad
You can also concatenate two variables with strings in them:
first = "Kings" last = 'road' what = first + last print(what) # => Kingsroad
Variables are an important tool in programming. They simplify complex calculations and thus make development easier. But to work successfully with variables, you must not only use them correctly, but also call them correctly. We'll talk about this in the next lesson.
Websites are constantly sending emails to their users. A common task is to automatically send a personalized email with the user's name in the header. If a database stores people's names, the task of generating the header boils down to concatenation: for example, you want to glue the string
Hello with a string containing a user's name.
Write a program that will create the header and body of an email using ready-made variables and print the resulting strings.
greeting, variables, a comma, and an exclamation point for the header. Print it in the correct order.
Use the variables
intro for the body of the message, with the second sentence on a new line.
The result should look like this:
Hello, Joffrey! Here is important information about your account security. We couldn't verify your mother's maiden name.
Perform the task using only two
The exercise doesn't pass checking. What to do? 😶
If you've reached a deadlock it's time to ask your question in the «Discussions». How ask a question correctly:
- Be sure to attach the test output, without it it's almost impossible to figure out what went wrong, even if you show your code. It's complicated for developers to execute code in their heads, but having a mistake before their eyes most probably will be helpful.
In my environment the code works, but not here 🤨
Tests are designed so that they test the solution in different ways and against different data. Often the solution works with one kind of input data but doesn't work with others. Check the «Tests» tab to figure this out, you can find hints at the error output.
My code is different from the teacher's one 🤔
It's fine. 🙆 One task in programming can be solved in many different ways. If your code passed all tests, it complies with the task conditions.
In some rare cases, the solution may be adjusted to the tests, but this can be seen immediately.
I've read the lessons but nothing is clear 🙄
It's hard to make educational materials that will suit everyone. We do our best but there is always something to improve. If you see a material that is not clear to you, describe the problem in “Discussions”. It will be great if you'll write unclear points in the question form. Usually, we need a few days for corrections.
By the way, you can participate in courses improvement. There is a link below to the lessons course code which you can edit right in your browser.
Consider how you should concatenate the variables to get the two-line output of the email body.
Remember that you can create a string that contains only the control sequence
\n. You can concatenate this string with variables to get proper text formatting.