Dictionaries in Python are used for data collection.

They are similar to map data type in other programming languages where we use key and value pairs.

dict():

dict() is used to define the Dictionaries in Python.

Example:

colorsValues = dict();
colorsValues[ 1 ] = 'Red';
colorsValues[ 2 ] = 'Green';
colorsValues[ 3 ] = 'blue';
print(
    colorsValues[ 2 ]
);

get():

get() method can be used to find the value by passing the key.

Example:

colorsValues = dict();
colorsValues[ 1 ] = 'Red';
colorsValues[ 2 ] = 'Green';
colorsValues[ 3 ] = 'blue';
print(
    colorsValues.get( 2 )
);

How to check whether Dictionary contains a specific key?

in statement can be used to check whether Dictionary contains a specific key.

Example:

colorsValues = dict();
colorsValues[ 1 ] = 'Red';
colorsValues[ 2 ] = 'Green';
colorsValues[ 3 ] = 'blue';

if ( 2 in colorsValues ) :
    print(
        colorsValues.get( 2 )
    );
else :
    print( '2 is not available' );

if ( 5 in colorsValues ) :
    print(
        colorsValues.get( 3 )
    );
else :
    print( '5 is not available' );