How to do I understand List and Dict Python concepts in just 5 mins!!

List and Dict Python concepts.py

#!/usr/bin/env python


def lists_examples():
    print 'List examples in Python\n', '======================================'

    L = []
    L = ['abc', 123, 1.23, {}]
    L = ['Bob', 40.0, ['dev', 'mgr']]
    L = list('spam')
    L = list(range(-4, 4))
    print L
    L = [x for x in 'vijay' if x in list('aeiou')]
    print L

    print 'x' in L

    L.append(4)
    print L
    L.pop(1)   # position based 'value' removing
    print L
    L.append('a')
    L.extend(['v', 'j', 'y'])
    L.remove(4)     # search based 'value' removing
    print L

    import random
    random.shuffle(L)
    print L
    random.shuffle(L)
    print ''.join(L)
    random.shuffle(L)
    print ''.join(L)
    random.shuffle(L)
    L.sort()
    print ''.join(L), L

    del L[0]
    print L
    L = list(map(ord, 'abcdefghijklmnopqrstuvwxyz'))
    print L, '\n'


def dict_examples():
    print 'Dictinary Examples (Mini Database)\n', '======================================'

    # Different method for creating the dictionary values
    D = {}
    D = dict(name='vijay', age=24)
    D = dict([('name', 'vijay'), ('age', 40)])

    D = {char: ord(char) for char in 'abcdefghijklmnopqrstuvwxyz'}
    print D, '\n'
    D = {'name': 'Vijay', 'age': 40, 'job': 'Engineer'}
    print "dict = ", D

    print "Dict keys to list ", list(D.keys())   # List Conversion
    print "Dict  to list ", list(D.items())

    D2 = {'company': 'None', 'location': 'IN'}
    D.update(D2)     # Merge Keys

    D['new_field'] = 'Searching'   # Adding or updating the values
    print D

    del D['new_field']

    print D.get('name')   # Fetching
    print D.pop('name')   # Removing

    print "keys = ", D.keys()
    print "values = ", D.values()
    print "items = ", D.items()

    dict_using_zip = dict(zip(['name', 'new_field', 'age', 'job', 'location', 'company'], ['Vijay', 'Searching', 40, 'Engineer', 'IN', 'None']))
    print 'New = ', dict_using_zip, '\n'

    dict_using_zip.clear()    # Clearing all values
    print dict_using_zip


def main():
    lists_examples()
    dict_examples()

if __name__ == '__main__':
    main()