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A b before an opening quote signi es a bytes literal rather than a string literal As a convenience, when creating bytes literals we can use a mixture of printable ASCII characters and hexadecimal escapes We cannot encode Tage s n s name using the ASCII encoding because it does not have the character or any accented characters, so attempting to do so will result in a UnicodeEncodeError exception being raised The Latin-1 encoding (also known as ISO-8859-1) is an 8-bit encoding that has all the necessary characters for this name On the other hand, artist Erno B nk would be less fortunate since the o character is not a Latin-1 character and so could not be successfully encoded Both names can be successfully encoded using Unicode encodings, of course Notice, though, that for UTF-16, the rst two bytes are the byte order mark these are used by the decoding function to detect whether the data is big- or little-endian so that it can adapt accordingly It is worth noting a couple more points about the strencode() method The rst argument (the encoding name) is case-insensitive, and hyphens and underscores in the name are treated as equivalent, so us-ascii and US_ASCII are considered the same There are also many aliases for example, latin , latin1 , latin_1 , ISO-8859-1 , CP819 , and some others are all Latin-1 The method can also accept an optional second argument which is used to tell it how to handle errors For example, we can encode any string into ASCII if we pass a second argument of ignore or replace at the price of losing data, of course or losslessly if we use backslashreplace which replaces non-ASCII characters with \x, \u, and \U escapes For example, artistencode("ascii", "ignore") will produce b'Tage sn' and artistencode("ascii", "replace") will produce b'Tage s n', whereas artistencode("ascii", "backslashreplace") will produce b'Tage \xc5s\xe9n' (We can also get an ASCII string using "{0!a}"format(artist), which produces 'Tage \xc5s\xe9n') The complement of strencode() is bytesdecode() (and bytearraydecode()) which returns a string with the bytes decoded using the given encoding For example:.

The differences between the 8-bit Latin-1, CP850 (an IBM PC encoding), and UTF-8 encodings make it clear that guessing encodings is not likely to be a successful strategy Fortunately, UTF-8 is becoming the de facto standard for plain text les, so later generations may not even know that other encodings ever existed Python py les use UTF-8, so Python always knows the encoding to use with string literals This means that we can type any Unicode characters into our strings providing our editor supports this When Python reads data from external sources such as sockets, it cannot know what encoding is used, so it returns bytes which we can then decode accordingly For text les Python takes a softer approach, using the local encoding unless we specify an encoding explicitly Fortunately, some le formats specify their encoding For example, we can assume that an XML le uses UTF-8, unless the < xml > directive explicitly speci es a different encoding So when reading XML we might extract, say, the rst 1 000 bytes, look for an encoding speci cation, and if found, decode the le using the speci ed encoding, otherwise falling back to decoding using UTF-8 This approach should work for any XML or plain text le that uses any of the single byte encodings supported by Python, except for EBCDIC-based encodings (CP424, CP500) and a few others (CP037, CP864, CP865, CP1026, CP1140, HZ, SHIFT-JIS-2004, SHIFT-JISX0213) Unfortunately, this approach won t work for multibyte encodings (such as UTF-16 and UTF-32) At least two Python packages for automatically detecting a le s encoding are available from the Python Package Index, pypipythonorg/pypi

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When designing MIDP applications, it is important to keep in mind that many networking and communications API calls can be time-consuming and can potentially block the application thread For instance, networking operations such as opening connections or receiving data from a server can cause the application thread to be blocked while waiting for the network activity to be completed Application developers should design their applications so that the applications do not invoke any time-consuming network operations in the callback functions that are invoked as a result of user interface actions For instance, CommandListener functions should not generally invoke networking functions, as listeners require a separate thread to keep the user interface functionality from interfering with the responsiveness of the application In addition, upon invoking time-consuming networking operations, the application should always display a progress screen, such as Gauge, and include a "Cancel" command to allow the user to escape from potentially indefinitely blocking network activity [ Team LiB ]

In this section we will draw on what we have covered in this chapter and the one before, to present two small but complete programs to help consolidate what we have learned so far The rst program is a bit mathematical, but it is quite short at around 35 lines The second is concerned with text processing and is more substantial, with seven functions in around 80 lines of code

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Quadratic equations are equations of the form ax2 + bx + c = 0 where a 0 describe parabolas The roots of such equations are derived from the formula

b2 2

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