string split using split() Function in python

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Cutting and slicing strings in Python

Published: Monday 4 th February 2013 Python strings as sequences of characters Python strings are sequences of individual characters, and share their basic methods of access with those other Python sequences — lists and tuples. The simplest way of extracting single characters from strings and individual members from any sequence is to unpack them into corresponding variables. ValueError : too many values to unpack Accessing characters in strings by index in Python Typically it's more useful to access the individual characters of a string by using Python's array-like indexing syntax. Here, as with python string split sequences, it's important to remember that indexing is zero-based; that is, the first item in the sequence is number 0. TypeError : 'str' object does not support item assignment If you want to modify a string, you have to create it as a totally new string. We'll look at how in a minute. Slicing Python strings Before that, what if you want to extract a chunk of more than one character, with known position and size. That's fairly easy and intuitive. We extend the square-bracket syntax a little, so that we can specify not only the starting position of the piece we want, but also where it ends. Just as before, we're specifying that we want to start at position 4 zero-based in the string. But now, instead of contenting ourselves with a single character from the string, we're saying that we want more characters, up to but not including the character at position 8. You might have thought that you were going to get the character at position 8 too. But that's not the way it works. Don't worry — you'll get used to it. If it helps, think of the second index the one after the colon as specifying the first character that you don't want. Incidentally, a benefit of this mechanism is that you can quickly tell how many characters you are going to end up with simply by subtracting the first index from the second. Using this syntax, you can omit either or both of the indices. The first index, if omitted, defaults to 0, so that your chunk starts from the beginning of the original string; the second defaults to the highest position in the string, so that your chunk ends at the end of the original string. Omitting both indices python string split likely to be of much practical use; as you might guess, it simply returns the whole of the original string. If the indexing mechanism were inclusive, the character at position n would appear twice. The first retrieved character always corresponds to the index before the colon; but thereafter, the pointer moves forward however many characters you specify as your stride, and retrieves the character at that position. And so on, until the ending index is reached or exceeded. If, as in the cases we've met so far, the parameter is omitted, it defaults to 1, so that every character in the specified segment is retrieved. An example makes this clearer. I know, it can make your head ache thinking about it, but Python knows what it's doing. But what if you want to retrieve a chunk based on the contents of the string, which we may not know in advance. Examining the contents Python provides string methods that allows us to chop a string up according to delimiters that we can specify. In other words, we can tell Python to look for a certain substring within our target string, and split the target string up around that sub-string. It does that by returning a list of the resulting sub-strings minus the delimiters. Remember that these methods have no effect on the string on which you invoke them; they simply return a new string. This also splits up a string based on content, the differences being that the result is python string split tuple, and it preserves the delimiter, along with the two parts of the target string on either side of it. Unlike splitpartition always does only one splitting operation, no matter how many times the delimiter appears in the target string. But we can get around this by creating a new string that's more to our liking, based on the old string. The string method that allows us to do this is replace. What has happened is that Python simply returned a new string according to the instructions we gave, then immediately discarded it, leaving our original string unaltered. To preserve our new string, we need to assign it to a variable.

To request the native byte order of the host system, use as the byte order value. Passing a object to without the encoding or errors arguments falls under the first case of returning the informal string representation see also the command-line option to Python. Return -1 if sub is not found. Also, multiple whitespaces will be considered as a single delimiter. And the'map' function changed all the strings of the list to ints. Otherwise, the behavior of str depends on whether encoding or errors is given, as follows.