While you have already been writing strings, you still do not know what they do. In this exercise we create a bunch of variables with complex strings so you can see what they are for. First an explanation of strings.
A string is usually a bit of text you want to display to someone, or "export"
out of the program you are writing. Python knows you want something to be a
string when you put either " (double-quotes) or ' (single-quotes)
around the text. You saw this many times with your use of print when you
put the text you want to go to the string inside " or ' after the
print. Then Python prints it.
Strings may contain the format characters you have discovered so far. You
simply put the formatted variables in the string, and then a % (percent)
character, followed by the variable. The only catch is that if you want
multiple formats in your string to print multiple variables, you need to
put them inside ( ) (parenthesis) separated by , (commas). It's as if
you were telling me to buy you a list of items from the store and you said, "I
want milk, eggs, bread, and soup." Only as a programmer we say, "(milk,
eggs, bread, soup)".
We will now type in a whole bunch of strings, variables, formats, and print them. You will also practice using short abbreviated variable names. Programmers love saving themselves time at your expense by using annoying cryptic variable names, so let's get you started being able to read and write them early on.
.. literalinclude:: ex/ex6.py
:linenos:
.. literalinclude:: ex/ex6.txt
:language: console
:linenos:
- Go through this program and write a comment above each line explaining it.
- Find all the places where a string is put inside a string. There are four places.
- Are you sure there's only four places? How do you know? Maybe I like lying.
- Explain why adding the two strings
wandewith+makes a longer string.