Basic Python 6: Statement, Indentation and Comments

Pubblicato il: 13 settembre 2022
sul canale di: Testing Tutorialspoint

172

Statement, Indentation and Comments:
-----------------------------------
Statement:
----------
Python interpreter can execute are called statements. For example, a = 1 is an assignment statement. if statement, for statement, while statement, etc.

Multi-line statement:

the end of a statement is marked by a newline character. But we can make a statement extend over multiple lines with the line continuation character (\).
ex:
a = 1 + 2 + 3 + \
4 + 5 + 6 + \
7 + 8 + 9

line continuation is implied inside parentheses ( ), brackets [ ], and braces { }.
ex:
a = (1 + 2 + 3 +
4 + 5 + 6 +
7 + 8 + 9)

Indentation:
------------
Most of the programming languages like C, C++, and Java use braces { } to define a block of code. Python, however, uses indentation.

A code block (body of a function, loop, etc.) starts with indentation and ends with the first unindented line. The amount of indentation is up to you, but it must be consistent throughout that block.
ex:
for i in range(1,11):
print(i)
if i == 5:
break

Comments:
---------
Comments are very important while writing a program. They describe what is going on inside a program, so that a person looking at the source code does not have a hard time figuring it out.

we use the hash (#) symbol to start writing a comment.

Multi-line comments
We can have comments that extend up to multiple lines. One way is to use the hash(#) symbol at the beginning of each line.

Another way of doing this is to use triple quotes, either ''' or """.

These triple quotes are generally used for multi-line strings. But they can be used as a multi-line comment as well. Unless they are not docstrings, they do not generate any extra code.
ex:
"""This is also a
perfect example of
multi-line comments"""

Docstrings in Python:
---------------------
A docstring is short for documentation string.

Python docstrings (documentation strings) are the string literals that appear right after the definition of a function, method, class, or module.
ex:
def double(num):
"""Function to double the value"""
return 2*num
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