Python Data Types

Filed Under: Python

Python Data Types are used to define the type of a variable. Previously we learned about statement and comment in Python. If you want then you can find it from Python Comment & Statement.

Python Data Types

There are different types of python data types. Some built-in python data types are:

  1. Python Data Type – Numeric

    Python numeric data type is used to hold numeric values like;

    1. int – holds signed integers of non-limited length.
    2. long- holds long integers(exists in Python 2.x, deprecated in Python 3.x).
    3. float- holds floating precision numbers and it’s accurate upto 15 decimal places.
    4. complex- holds complex numbers.

    In Python we need not to declare datatype while declaring a variable like C or C++. We can simply just assign values in a variable. But if we want to see what type of numerical value is it holding right now, we can use type(), like this:

    
    #create a variable with integer value.
    a=100
    print("The type of variable having value", a, " is ", type(a))
    
    #create a variable with float value.
    b=10.2345
    print("The type of variable having value", b, " is ", type(b))
    
    #create a variable with complex value.
    c=100+3j
    print("The type of variable having value", c, " is ", type(c))
    

    If you run the above code you will see output like the below image.

    python data types, use of type function

  2. Python Data Type – String

    The string is a sequence of characters. Python supports Unicode characters. Generally, strings are represented by either single or double quotes.

    
    a = "string in a double quote"
    b= 'string in a single quote'
    print(a)
    print(b)
    
    # using ',' to concatenate the two or several strings
    print(a,"concatenated with",b)
    
    #using '+' to concate the two or several strings
    print(a+" concated with "+b)
    

    The above code produce output like below picture-
    python data type, python string data type example

  3. Python Data Type – List

    The list is a versatile data type exclusive in Python. In a sense, it is the same as the array in C/C++. But the interesting thing about the list in Python is it can simultaneously hold different types of data. Formally list is an ordered sequence of some data written using square brackets([]) and commas(,).

    
    #list of having only integers
    a= [1,2,3,4,5,6]
    print(a)
    
    #list of having only strings
    b=["hello","john","reese"]
    print(b)
    
    #list of having both integers and strings
    c= ["hey","you",1,2,3,"go"]
    print(c)
    
    #index are 0 based. this will print a single character
    print(c[1]) #this will print "you" in list c
    

    The above code will produce output like this-

    Python Data Type - list example output

  4. Python Data Type – Tuple

    Tuple is another data type which is a sequence of data similar to list. But it is immutable. That means data in a tuple is write protected. Data in a tuple is written using parenthesis and commas.

    
    #tuple having only integer type of data.
    a=(1,2,3,4)
    print(a) #prints the whole tuple
    
    #tuple having multiple type of data.
    b=("hello", 1,2,3,"go")
    print(b) #prints the whole tuple
    
    #index of tuples are also 0 based.
    
    print(b[4]) #this prints a single element in a tuple, in this case "go"
    

    The output of this above python data type tuple example code will be like below image.
    Python Data Type - tuple example output

  5. Dictionary

    Python Dictionary is an unordered sequence of data of key-value pair form. It is similar to the hash table type. Dictionaries are written within curly braces in the form key:value. It is very useful to retrieve data in an optimized way among a large amount of data.

    
    #a sample dictionary variable
    
    a = {1:"first name",2:"last name", "age":33}
    
    #print value having key=1
    print(a[1])
    #print value having key=2
    print(a[2])
    #print value having key="age"
    print(a["age"])
    

    If you run this python dictionary data type example code, output will be like below image.
    Python Data Type - python dictionary example output

So that’s all for today about python data types. Don’t forget to run every piece of code in your own machine. Also don’t just copy-paste. Try to write the lines of code on your own.
#happy_coding 🙂

Reference: Python Documentation for Data Types

Comments

  1. Nidhesh Tiwari says:

    @Shubham, This is not necessary. Double are required compulsory for text/strings whether you use them as Key or Value. Whenever you are using numeric as key or value, it is not mandatory that you have to use double quotes but if you are using string then you have to use it. For ex.:
    Case 1 : Numeric as Key without quotes and String as value
    a={1:”One”,2:”Two”,”Age”:35}
    >>> a[1]
    ‘One’

    Case 2: Numeric as Key in quotes and String as value
    >>> a={“1″:”One”,2:”Two”,”Age”:35}
    >>> a[“1”]
    ‘One’

    Case 3: String as Key and Numeric as value
    >>> a={“One”:1,2:”Two”,”Age”:35}
    >>> a[“One”]
    1

    Hope it is clear.
    Thanks

  2. Shubham says:

    the code for dictionary data type is wrong …as the key is always surrounded by double quotes
    “key”

    correct code:-
    a = {“1″:”first name”,”2″:”last name”, “age”:33}

    #print value having key=1
    print(a[“1”])
    #print value having key=2
    print(a[“2″])
    #print value having key=”age”
    print(a[“age”])

    1. Mustajab Hussain says:

      That doesn’t matter. You can still declare key using double quotes.

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