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CHAPTER 1 INSTANT HACKING: THE BASICS
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Note Tired of backslashes As you will see later in this chapter, you can avoid most of them by using long
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strings and raw strings (which can be combined).
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Concatenating Strings
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Just to keep whipping this slightly tortured example, let me show you another way of writing the same string: >>> "Let's say " '"Hello, world!"' 'Let\'s say "Hello, world!"' I ve simply written two strings, one after the other, and Python automatically concatenates them (makes them into one string). This mechanism isn t used very often, but it can be useful at times. However, it works only when you actually write both strings at the same time, directly following one another: >>> x = "Hello, " >>> y = "world!" >>> x y SyntaxError: invalid syntax In other words, this is just a special way of writing strings, not a general method of concatenating them. How, then, do you concatenate strings Just like you add numbers: >>> "Hello, " + "world!" 'Hello, world!' >>> x = "Hello, " >>> y = "world!" >>> x + y 'Hello, world!'
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String Representations, str and repr
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Throughout these examples, you have probably noticed that all the strings printed out by Python are still quoted. That s because it prints out the value as it might be written in Python code, not how you would like it to look for the user. If you use print, however, the result is different: >>> "Hello, world!" 'Hello, world!' >>> 10000L 10000L >>> print "Hello, world!" Hello, world! >>> print 10000L 10000
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CHAPTER 1 INSTANT HACKING: THE BASICS
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As you can see, the long integer 10000L is simply the number 10000 and should be written that way when presented to the user. But when you want to know what value a variable refers to, you may be interested in whether it s a normal integer or a long, for example. What is actually going on here is that values are converted to strings through two different mechanisms. You can use both mechanisms yourself, through the functions str and repr. str simply converts a value into a string in some reasonable fashion that will probably be understood by a user, for example.11 repr creates a string that is a representation of the value as a legal Python expression. Here are a few examples: >>> print repr("Hello, world!") 'Hello, world!' >>> print repr(10000L) 10000L >>> print str("Hello, world!") Hello, world! >>> print str(10000L) 10000 A synonym for repr(x) is `x` (here, you use backticks, not single quotes). This can be useful when you want to print out a sentence containing a number: >>> temp = 42 >>> print "The temperature is " + temp Traceback (most recent call last): File "<pyshell#61>", line 1, in print "The temperature is " + temp TypeError: cannot add type "int" to string >>> print "The temperature is " + `temp` The temperature is 42
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Note Backticks are removed in Python 3.0, so even though you may find backticks in old code, you should
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probably stick with repr yourself.
The first print statement doesn t work because you can t add a string to a number. The second one, however, works because I have converted temp to the string "42" by using the backticks. (I could have just as well used repr, which means the same thing, but may be a bit clearer. Actually, in this case, I could also have used str. Don t worry too much about this right now.) In short, str, repr, and backticks are three ways of converting a Python value to a string. The function str makes it look good, while repr (and the backticks) tries to make the resulting string a legal Python expression.
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