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Notice that we have taken advantage of Python s string literal concatenation inside the strmaketrans() call and inside the second print() call to spread strings over multiple lines without having to escape newlines or use explicit concatenation We called strmaketrans() on an empty string because it doesn t matter what string it is called on; it simply processes its arguments and returns a translation table The strmaketrans() and strtranslate() methods can also be used to delete characters by passing a string containing the unwanted characters as the third argument to strmaketrans() If more sophisticated character translations are required, we could create a custom codec see the codecs module documentation for more about this Python has a few other library modules that provide string-related functionality We ve already brie y mentioned the unicodedata module, and we ll show it in use in the next subsection Other modules worth looking up are difflib which can be used to show differences between les or between strings, the io module s ioStringIO class which allows us to read from or write to strings as though they were les, and the textwrap module which provides facilities for wrapping and lling strings There is also a string module that has a few useful constants such as ascii_letters and ascii_lowercase We will see examples of some of these modules in use in 5 In addition, Python provides excellent support for regular expressions in the re module 13 is dedicated to this topic

The strformat() method provides a very exible and powerful way of creating strings Using strformat() is easy for simple cases, but for complex formatting we need to learn the formatting syntax the method requires

In the Java language, declaring an array to be volatile only makes the reference to the array volatile, not the individual elements The following code uses the getAndIncrement method of the AtomicLong class to implement a thread safe sequencer The getAndIncrement method atomically obtains the value of the variable, increments it, and returns the original value Such a sequencer could be used to implement a task queue in some master/worker designs

The strformat() method returns a new string with the replacement elds in its string replaced with its arguments suitably formatted For example:

3

>>> "The novel '{0}' was published in {1}"format("Hard Times", 1854) "The novel 'Hard Times' was published in 1854"

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Each replacement eld is identi ed by a eld name in braces If the eld name is a simple integer, it is taken to be the index position of one of the arguments passed to strformat() So in this case, the eld whose name was 0 was replaced by the rst argument, and the one with name 1 was replaced by the second argument If we need to include braces inside format strings, we can do so by doubling them up Here is an example:

class Sequencer { private AtomicLong sequenceNumber = new AtomicLong(0); public long next() { return sequenceNumbergetAndIncrement(); } }

>>> "{{{0}}} {1} ;-}}"format("I'm in braces", "I'm not") "{I'm in braces} I'm not ;-}"

FIGURE 33 Many-to-many relationship between a Student and a Class table not violate the primary key This means that you can relate each student to all the classes he attends, and you can relate all the students in a particular class to that class This gives you a many-to-many relationship It may sound complex, but once you create a many-to-many relationship and add some data to the tables, it becomes pretty clear The best way to really understand it is to do it When we build our physical model in 9, we look more closely at many-to-many relationships, including ways to make them most useful

If we try to concatenate a string and a number, Python will quite rightly raise a TypeError But we can easily achieve what we want using strformat():

When variables can be accessed by multiple threads, care must be taken to ensure that data corrupting race conditions cannot occur Java provides a construct called synchronized blocks to allow the programmer to ensure mutually exclusive access to shared variables Synchronized blocks also serve as implicit memory fences, as described in the Implementation Mechanisms design space (Section 63) Every class in a Java program is a direct or indirect subclass of class Object Every Object instance implicitly contains a lock A synchronized block is always associated with an object: Before a thread can enter a synchronized block, it must acquire the lock associated with that object When the thread leaves the synchronized block, whether normally or because an exception was thrown, the lock is released At most one thread can hold the lock at the same time, so synchronized blocks can be used to ensure mutually exclusive access to data They are also used to synchronize memory A synchronized block is specified in code as

>>> "{0}{1}"format("The amount due is $", 200) 'The amount due is $200'

We can also concatenate strings using strformat() (although the strjoin() method is best for this):

>>> x = "three" >>> s ="{0} {1} {2}" >>> s = sformat("The", x, "tops") >>> s 'The three tops'

synchronized(object_ref){body of block}

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