Fancier Output Formatting So far we’ve encountered two ways of writing values: expression statements and the statement. (A third way is using the write() method of file objects; the standard output file can be referenced as sys.stdout. See the Library Reference for more information on this.) Often you’ll want more control over the formatting of your output than simply printing space-separated values. There are two ways to format your output; the first way is to do all the string handling yourself; using string slicing and concatenation operations you can create any layout you can imagine.

Mar 04, 2013 I need to extract full sentences from a file and the save them in a set. I tried getline to get a full line and then removed the characters after the period. Reading From a Text File (Visual C#)This example reads the contents of a text file into a string using the Read. End method of the Stream.

The string types have some methods that perform useful operations for padding strings to a given column width; these will be discussed shortly. The second way is to use the method. The module contains a class which offers yet another way to substitute values into strings. One question remains, of course: how do you convert values to strings? Luckily, Python has ways to convert any value to a string: pass it to the or functions.

The function is meant to return representations of values which are fairly human-readable, while is meant to generate representations which can be read by the interpreter (or will force a if there is no equivalent syntax). For objects which don’t have a particular representation for human consumption, will return the same value as.

Many values, such as numbers or structures like lists and dictionaries, have the same representation using either function. Strings and floating point numbers, in particular, have two distinct representations. Some examples.

>>>s = 'Hello, world.' >>>str ( s ) 'Hello, world.'

>>>repr ( s ) 'Hello, world.' ' >>>str ( 1.0 / 7.0 ) '0.57' >>>repr ( 1.0 / 7.0 ) '0.5714285' >>>x = 10 * 3.25 >>>y = 200 * 200 >>>s = 'The value of x is ' + repr ( x ) + ', and y is ' + repr ( y ) + '.'

>>>print s The value of x is 32.5, and y is 40000. >>># The repr() of a string adds string quotes and backslashes. Hello = 'hello, world n ' >>>hellos = repr ( hello ) >>>print hellos 'hello, world n' >>># The argument to repr() may be any Python object.

Repr (( x, y, ( 'spam', 'eggs' ))) '(32.5, 40000, ('spam', 'eggs'))' Here are two ways to write a table of squares and cubes. >>>f = open ( 'workfile', 'w' ) >>>print f The first argument is a string containing the filename. The second argument is another string containing a few characters describing the way in which the file will be used. Mode can be 'r' when the file will only be read, 'w' for only writing (an existing file with the same name will be erased), and 'a' opens the file for appending; any data written to the file is automatically added to the end. 'r+' opens the file for both reading and writing. The mode argument is optional; 'r' will be assumed if it’s omitted. On Windows, 'b' appended to the mode opens the file in binary mode, so there are also modes like 'rb', 'wb', and 'r+b'.

Python on Windows makes a distinction between text and binary files; the end-of-line characters in text files are automatically altered slightly when data is read or written. This behind-the-scenes modification to file data is fine for ASCII text files, but it’ll corrupt binary data like that in JPEG or EXE files. Be very careful to use binary mode when reading and writing such files. On Unix, it doesn’t hurt to append a 'b' to the mode, so you can use it platform-independently for all binary files. Methods of File Objects The rest of the examples in this section will assume that a file object called f has already been created. To read a file’s contents, call f.read(size), which reads some quantity of data and returns it as a string.

Size is an optional numeric argument. Best Symbian S60v5 Apps Download. When size is omitted or negative, the entire contents of the file will be read and returned; it’s your problem if the file is twice as large as your machine’s memory.