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| Figure 10 . Concatenate through placement. |
|---|
>>>print("Dick"'Baldwin')
DickBaldwin>>>print('Joe' "Smith")
JoeSmith>>> |
Note that you can mix the different quote types. Also, it doesn't matter if there is whitespace in between. The whitespace doesn't carry through to theoutput.
If you want any space between the substrings in the output, you must include that space inside the quotes that delimit the individual strings asshown in Figure 11 .
| Figure 11 . Creating whitespace. |
|---|
>>>x = "Richard ">>>y = " Baldwin">>>print(x + "G." + y)
Richard G. Baldwin>>> |
The plus operator (+) can be used to concatenate strings as also illustrated in Figure 11 .
This fragment assigns string literal values to two variables, and then uses the plus operator to concatenate the contents of those variables with anotherstring literal.
Of course, it could also have been used to concatenate the contents of the two variables without the string literal in between.
Note that the string literals in Figure 11 contain space characters. There is a space after the d in my first name and before the B in my last name. That is what Imeant earlier when I said that if you want any space between the substrings in the output, you must include that space inside the quotes
Figure 12 illustrates string concatenation through the use of the code visualizer that you learned about in an earlier module.
Figure 12. Visualizing string concatenation.
The code in the code block in Figure 12 is similar to the code in Figure 10 and to the use of "+" operator for string concatenation. The diagram on the right shows how the concatenationof strings produces objects on the heap containing the concatenated strings.
The variable named var1 points to an object of type str containing a string that was produced by concatenating two literal strings through placement .
Similarly, the variable named var2 points to a different object of type str containing a string that was produced by concatenating two different literal strings through placement .
The variable named var3 points to a third object of type str containing a string that was produced by using the "+" operator to concatenate the contents of two existing objects of type str . Although it might not be obvious at this point in the course, it is important to note that the contentsof the third object contains the concatenation of copies of the contents of the first two objects. In particular, it doesn't simply contain pointers to theother two objects.
I will have more to say about strings in a future module. Before that, however, we need to learn how to create and execute script files, and we also need tolearn a little more about Python syntax.
This section contains a variety of miscellaneous information.
Financial : Although the Connexions site makes it possible for you to download a PDF file for thismodule at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should beaware that some of the HTML elements in this module may not translate well into PDF.
I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version of the module.
In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale on Amazon.com showing me as the author. Ineither receive compensation for those sales nor do I know who does receive compensation. If you purchase such a book, please beaware that it is a copy of a module that is freely available on cnx.org and that it was made and published withoutmy prior knowledge.
Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.
-end-
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