Unicode, Control Flow, And Indentation/Indent in Python

Unicode

               Unicode provides a unique number for every character, no matter what the platform,no matter what the program,no matter what the language.

In Python 2, two types are used to represent strings. 

1. str - was a “byte string” type; it represented a sequence of bytes in some particular text encoding, and defaulted to ASCII. 

                     stringtype = 'This is string.'

2. Unicode -  Unicode string type.

                    unicodetype = u'This is unicode string'

In Python 3, there is one and only one string type. 

1.  str - It is used as a string and unicode.
   
   

Example:
Python2:
>>> s = '\u0026' #simple string

>>> s
'\\u0026'

>>> s = u'\u0026’  #unicode
>>> s

u'&'

But in python3 we don’t need to write ‘u’ before the string

>>> s = '\u0026'

>>> s

'&'

Check with emoji (not supported in py2)

2.0

>>> x = u"i ♥ python"

>>> x

u'i \u2665 python'

>>> x = 'i \u2665 python'

>>> x

'i \\u2665 python'

3.0

>>> x = 'i ♥ python'

>>> x

'i ♥ python'

>>> x = 'i \u2665 python'

>>> x

'i ♥ python'

Unicode in variable and function names.

# python 3: create one file and write below code and run it from terminal

def Ω(n):

    return n + 1

ã = 4

print(Ω(ã))

1. Selective/Conditional:
       - if<condition>
       - if<cond>...elif<cond>..else
       - if<cond>...elif<cond>..elif<cond>..else

2. Iterative
       - for
       - while 

3. Transfer
      - break
     - continue
     - pass

Before start with control flow statement we need to learn about 

Indentation/Indent

By default 4 spaces indentation is present(We are doing programing from the terminal that’s why we need to manually add indentation).If you want to change it we can.

>>> if 5 > 4:

...     print("dd")

... 

>>> if 5 > 4:

... print("ss")

  File "<stdin>", line 2

    print("ss")

        ^

IndentationError: expected an indented block