Introduction to the python - Letsprogram

Basic concepts in python

Comments in Python start with the hash character, #, and extend to the end of the physical line. 

A comment may appear at the start of a line or following whitespace or code, but not within a string literal. A hash character within a string literal is just a hash character. Since comments are to clarify code and are not interpreted by Python, they may be omitted when typing in examples.

# this is the first comment                                             
spam = 1  # and this is the second comment                              
          # ... and now a third!                                        
text = "# This is not a comment because it's inside quotes."            

Let’s try some basic Python commands. Start the interpreter and wait for the python prompt, >>>. 

Numbers

The equal sign (=) is used to assign a value to a variable. Afterward, no result is displayed before the next interactive prompt. In Python, we need no to define the variable before using it. But If a variable is not “defined” (assigned a value), trying to use it will give you an error

Using  (/)  gives you float value of remainder using  (//) gives integer value of the remainder.

In addition to int and float, Python supports other types of numbers, such as Decimal and Fraction. Python also has built-in support for complex numbers and uses the j or J suffix to indicate the imaginary part (e.g. 3+5j).

All concepts have an example given below

Strings

• ( \ ) is used to escape quotes in a string.

• You can use raw strings by adding an r before the first quote it makes sure to ignore the meaning of ( \n ).

• Strings can be concatenated (glued together) with the + operator, and repeated with *

• Two or more strings beside each other are concatenated automatically.

All concepts have an example given below