In the daily life of the programmer need to solve a lot of problems. For these purposes, perfect Python language (“online” or “Python” on Russian manners). Backup, creating games for Android or for Windows, read and save messages from e-mail – not the most difficult task for an experienced programmer. But for beginners to learn Python (work with strings, lists, files,) will seem like a fairy tale, because the methods and functions of each type of data make life easier for the user.
“Python” allows you to work with numbers, symbols, files, functions. And difficulties never occurs because this language is convenient and easy to use. Strings in Python – the type of data to process textual information. Length the entered text can be limited only by the computer resources. You need to remember that line – immutable data type. Everything that happens with the original text is assigned to a new variable.
In Python training involves the study of 2 kinds of text: ordinary strings (sequence of bytes) and Unicode string (list of characters).
In Python scripts allow you to use string literals. These symbols can be written using the apostrophe, quotation marks (single or double), the specified characters is entered three times, for example, """apple tree""" where performs the role of the Enter key when typing in a regular text editor. The backslash (back slash) inside of the literals is of special significance. It is necessary to enter special characters. Remember that the backslash must not be last character in the string, otherwise the compiler will issue an error.
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In Python, working with strings involves either manual entry of the text or prompt to the user that he entered the necessary characters. Python reads the received data using the standard input function (). String in Python consists of a sequence of characters. To know their number, you can use len (). In Python, the symbol is treated as a string, the length of which is equal to 1.
Any object in the “Python” can be cast to string data type by calling a built-in function str (). Python has several classes. To translate an object from one data type to another, you can use the cast function whose name matches the name of the category. So, int converts to an integer, str the string float in the float category.
Otherwise, they are referred to as slices or slices. Slice allows you to extract from the typed character in a specified period. Slice cannot be used without indexing. Addressing starts with 0. If you refer to the line from the end, then the indexing begins with -.
There are 3 forms of cuts:
The user has the ability to use Python functions to work with strings:
In Python, working with strings involves the use of several methods:
In Python, working with strings is nice and the fact that the user can format the text in the specified image. I.e. the programmer specifies the condition which needs to match the entered text. This way you can display the table without connecting a special module PTable. This technique is called a format string. For example, if you enter in IDLE Print "%s is %d" % ("one",1), then the result will be 1 is one.
the% allows you to connect the format string and is its main operator. In Python characters are coming as addition to %.
Output a single character.
A String expression.
Output real (fractional) decimal number.
There are other special characters, but they are used in solving complex tasks.
A language like Python allows learning to be faster and easier because the code is concise and comprehensive. To verify this, you need to address a number of problems.
1. Given a string. Get a new text, which replaces all occurrences of the first symbol of the “$” except for himself.
Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."
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