Python learning (Hello, World!) Part-1

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Python is a very simple language, and has a very straightforward syntax. It encourages programmers to program without boilerplate (prepared) code. The simplest directive in Python is the "print" directive - it simply prints out a line (and also includes a newline, unlike in C).

There are two major Python versions, Python 2 and Python 3. Python 2 and 3 are quite different. This tutorial uses Python 3, because it more semantically correct and supports newer features.

For example, one difference between Python 2 and 3 is the print statement. In Python 2, the "print" statement is not a function, and therefore it is invoked without parentheses. However, in Python 3, it is a function, and must be invoked with parentheses.

To print a string in Python 3, just write:

• script.py
• IPython Shell

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print("This line will be printed.")

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Indentation

Python uses indentation for blocks, instead of curly braces. Both tabs and spaces are supported, but the standard indentation requires standard Python code to use four spaces. For example:

• script.py
• IPython Shell

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2

3

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x = 1

if x == 1:

# indented four spaces

print("x is 1.")

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Exercise

Use the "print" command to print the line "Hello, World!".

• script.py
• IPython Shell

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print("Goodbye, World!")

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