Python provides no braces to indicate blocks of code for class and function definitions or flow control. All the Python keywords contain lowercase letters only. These are reserved words and you cannot use them as constant or variable or any other identifier names. The following list shows the Python keywords. If the identifier also ends with two trailing underscores, the identifier is a language-defined special name. Starting an identifier with two leading underscores indicates a strongly private identifier. Starting an identifier with a single leading underscore indicates that the identifier is private. All other identifiers start with a lowercase letter. Here are naming conventions for Python identifiers −Ĭlass names start with an uppercase letter. Thus, Manpower and manpower are two different identifiers in Python. Python is a case sensitive programming language. Python does not allow punctuation characters such as $, and % within identifiers. An identifier starts with a letter A to Z or a to z or an underscore (_) followed by zero or more letters, underscores and digits (0 to 9).

$ chmod +x test.py # This is to make file executableĪ Python identifier is a name used to identify a variable, function, class, module or other object. Now, try to run this program as follows − We assume that you have Python interpreter available in /usr/bin directory. Type the following source code in a test.py file − Let us write a simple Python program in a script. When the script is finished, the interpreter is no longer active. Invoking the interpreter with a script parameter begins execution of the script and continues until the script is finished. However in Python version 2.4.3, this produces the following result − If you are running new version of Python, then you would need to use print statement with parenthesis as in print ('Hello, Python!'). Type the following text at the Python prompt and press the Enter − Type 'help', 'copyright', 'credits' or 'license' for more information. Invoking the interpreter without passing a script file as a parameter brings up the following prompt − Let us execute programs in different modes of programming. However, there are some definite differences between the languages.

The Python language has many similarities to Perl, C, and Java.

Simpl programming