Python3- Data types1

-
Python

DATA TYPES:-
        In python, every value has a datatypes. Everything is the object in python programming, datatypes are actually classes and variables are instances(object) of these classes.
       1. Numeric 
       2. Boolean
       3. Sequence type
              1.Strings
               2.List
               3.Tuple
       4. Set
       5. Dictionaries.       
                               
Python Data Types
                               


NUMBERS(NUMERIC):-

           In this numeric values are stores in variables which are immutable (the values assigned to a variables can be changed).
          * Integers(int) ,float point numbers(float)  and complex numbers(complex) are involved in this.
          
          * type() function  used to know which class a variable or value belongs to .

          * isinstance() function used to check if an object belongs to particular class or not. 

          * complex() function used to convert integers to complex


     eg:-
        1.     
                     a=2
                     print(a, "is of type", type(a))       #type(a) returns the   class of a value(a) 

        Output:-  2 is of type <class 'int'> 

                  
         2.     
                    a=2.5
                    print(a,"is of type",type(a))
   
        Output:-  2.5 is of type <class 'float'>

         3.   
                    a=3+4j
                    print(a,"is complex number?")
                    print(isinstance(a,complex))          #isinstance() returns  True if condition is true else False
                    print(a,"is of type" ,type(a))

        Output:-  3+4j is complex number?
                       True
                        3+4j is of type <class 'complex' >

  BOOLEAN :-

             It represents the truth values (True and False).
            * If condition is true returns True else returns False.

       eg:-        
                     a=True              #a is a boolean type.
                     print(type(a))
     
        Output:-   <class 'bool'>


PYTHON STRINGS :-

            String is the sequence of Unicode characters .(means it can store special characters and non English characters) 
            *We can use single or double quotes to represent strings.
        
      eg:-  
               s= "This is Python Strings."           #Here we can use single or double quotes, it returns same  output in python
               print(s)                                                   
               print(type(s))
          
    Output:-  This is Python Strings.
                    < class 'str'  >                 #str stands for string.  
 
         *If string spans more than one line we can use multi-line strings ,it can denoted using triple quotes,''' or """.

      eg:-
               s ="""This is Python 
                           Strings."""
                print(s)
                print(type(s))
   
      Output:- This is Python 
                             Strings. 
                    < class 'str' >
     *  A String in python consists of a series or sequence of characters-letters, numbers, and special characters.
      * Strings can be indexed-often synonymously called Subscripted as well.
     *  Similar to C, the first character of a string has the index 0.

               

  eg:-
              a="PYTHON"
              print(a)                     #returns a value.
              print(a[0])                 #returns first letter in a value.
              print(a[len(a)-1])        #returns last letter ,len() returns  the length of the value (a[5]).
              print(a[0:4])             #returns the letters from 0 to 3 (index 4  can't be considered).
              print(a[-1])            #returns last letter .
              print(a[:])            #returns a value because no limits .
              print(a[4])           #returns the letter of index 4.

      Output:- 
                     PYTHON
                     P
                     N
                     PYTH
                     N
                     PYTHON
                     O

      * str() function used to convert integers to strings.

     *  int() function used to convert strings to integers.
  
    eg:- 
               a=1
               print(type(a))
               a=str(a)
               print(a)
               print(type(a))

      Output:-
                    < class 'int' >
                    1
                    < class 'str' >
 
       * ord() function returns the number representing the Unicode code of a specified character(ASCII values) .
                            syntax:::-  ord(character)

       eg:-
                    x=ord("h")
                    print(x)

         Output:-
                          104








Comments

Post a Comment

Popular posts from this blog

Python3 Function Arguments

-
Python Function Arguments 1 . Function Arguments :        def greet(name, msg):              print("Hello {0}, {1} ".format(name, msg))        #call a function with arguments        greet("Satish", "good morning") output: Hello Satish, good morning         #suppose if we pass one argument        greet("satish") output:   ----------------------------------------------------------------------               ---               TypeError               TypeError : greet( ) missing 1 required positional argument: 'msg' Different Forms of Arguments :        def greet(name, msg="good morning"):              print("Hello {0} , {1}".format(name, msg))            greet("Satish", "good night") output :   Hello Satish , good night         #with out msg argument        greet("Satish")   output:   Hello Satish , good morning   Once we have a default argument , all the arguments to its right must also have
Read more

Python3 File Handling

-
Python  File Handling FILE  I/O          File is a named location on disk to store related information. It is used to store data permanently in a non-volatile memory (eg. hard disk).  Since, random access memory (RAM) is volatile which loses its data when computer is turned off ,we use files for the future use of the data    When we want to read from or write to a file we need to open it first. When we are done, it needs to be closed, so that resources that are tied with the file are freed.  File operation :   1.  Open a file   2.  Read or write(perform operation)   3.  Close the file Opening a File        Python has a built-in function open() to open a file. This function returns a file object, also called a handle, as it is used to read or modify the file accordingly.        #open file in current directory            f=open('example.txt')          we can specify the mode while opening a file. In mode, we specify whether we want to read 'r' , write 'w' or appen
Read more

Python3

-
Image
WHY PYTHON?      *Basically python is general purpose ,high level,interpreted language .         *Very simple language to learn.      *It has best packages for AI,deep learning,machine learning etc...      *It also has very interactive frame work that is ipython notebook .      *Extensively used in industry  Features OF PYTHON:-                   *simplicity                    *open source language- free for everyone 👯👫                    *portability-code sharing much easier   💯                                     *Embeddable and extensible                   *interpreted line by line (CPU and Memory Management)                   *huge libraries (Numpy , Matplotlib , Scikit-learn)                   *object oriented PYTHON  KEYWORDS(🔑) :                               keywords are reserved words.                              In python, there are 35 keywords.                      # get all keywords in python                  >>> import keyword             >>> print(
Read more