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Commit e85ec9b

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RezwanRezwan
Rezwan
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Rezwan
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‎HackerRank/DefaultDict Tutorial.py

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'''
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Created on Jun 9, 2016
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@author: Md. Rezwanul Haque
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'''
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from collections import defaultdict
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d, n = defaultdict(list), list(map(int, input().split()))
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for i in range(n[0]):
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d[input()].append(i + 1)
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for i in range(n[1]):
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print(' '.join(map(str, d[input()])) or -1)

‎HackerRank/Tuples.py

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'''
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Created on May 5, 2016
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@author: Md. Rezwanul Haque
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'''
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input()
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ans = hash(tuple(map(int,input().split())))
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print(ans)

‎Tuples and Dictionaries.py

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####### Tuples #########
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'''
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* A tuple is a sequence of immutable Python objects. Tuples are sequences, just like lists.
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'''
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# Define a tuple
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my_tuple = ()
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my_tuple = (1,2,3,5,4)
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print(my_tuple) # (1, 2, 3, 5, 4)
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my_tuple = ('Hello', 1, "World", 7)
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print(my_tuple) # ('Hello', 1, 'World', 7)
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print(my_tuple[0]) # Hello
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print(my_tuple[3]) # 7
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print(my_tuple[1:3]) # (1, 'World')
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# Tuples usually supports the sequence operations supported by string and lists:
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# Concatenation
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a = (1, 3)
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b = (2, 4)
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c = a + b
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print(c) # (1, 3, 2, 4)
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# Repetition
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a = (1,2,3,4,5)
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b = 2
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c = a * b
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print(c) # (1, 2, 3, 4, 5, 1, 2, 3, 4, 5)
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# Indexing and slicing
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a = (1, 2, 3, 4, 5)
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print(a[0], a[1:5]) # 1 (2, 3, 4, 5)
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# List to tuple
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my_list = [1, 2,3, 4, 5]
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my_tuple = tuple(my_list)
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print(my_tuple) # (1, 2, 3, 4, 5)
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# Sort a tuple
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my_tuple = (2, 5, 1, 4, 3)
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a = sorted(my_tuple) # It converts tuple to list and sort
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print(a) # [1, 2, 3, 4, 5]
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######
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B = (1, [2, 3], 4)
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B[1][0] = 'spam'
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print(B) # (1, ['spam', 3], 4)
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# how to add value to a tuple?
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t = (1,2,3)
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t = t + (1,)
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print (t) # (1,2,3,1)
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a = (1,2,3,5,6)
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a = a[:3] + (4,) + a[3:]
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print(a) # (1, 2, 3, 4, 5, 6)
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# How to input an integer tuple from user?
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my_tuple = tuple(map(int,input().split()))
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print(my_tuple)
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###
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my_tuple = ()
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for i in range(5):
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a = int(input())
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my_tuple += (a,)
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print(my_tuple)
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'''
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Input:
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1
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2
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3
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4
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5
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Output:
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(1, 2, 3, 4, 5)
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'''
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############### Dictionaries ###################
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# empty dictionary
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my_dict = {}
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# dictionary with integer keys
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my_dict = {1: 'apple', 2: 'ball'}
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print(my_dict) # {1: 'apple', 2: 'ball'}
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# dictionary with mixed keys
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my_dict = {'name': 'John', 1: [2, 4, 3]}
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print(my_dict) # {'name': 'John', 1: [2, 4, 3]}
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# using dict()
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my_dict = dict({1:'apple', 2:'ball'})
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print(my_dict) # {1: 'apple', 2: 'ball'}
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# from sequence having each item as a pair
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my_dict = dict([(1,'apple'), (2,'ball')])
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print(my_dict) # {1: 'apple', 2: 'ball'}
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### How to access elements from a dictionary?
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my_dict = {1: 'Rezwan', 'Haque' : 7}
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print(my_dict[1]) # Rezwan
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print(my_dict['Haque']) # 7
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print(my_dict.get('Haque')) # 7
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print(my_dict.keys()) # dict_keys([1, 'Haque'])
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### Python Dictionary methods (https://www.programiz.com/python-programming/dictionary)
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'''
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clear() => Remove all items form the dictionary.
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copy() => Return a shallow copy of the dictionary.
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fromkeys(seq[, v]) => Return a new dictionary with keys from seq and value equal to v (defaults to None).
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get(key[,d]) => Return the value of key. If key doesnot exit, return d (defaults to None).
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items() => Return a new view of the dictionary's items (key, value).
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keys() Return a new view of the dictionary's keys.
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pop(key[,d]) => Remove the item with key and return its value or d if key is not found. If d is not provided and key is not found, raises KeyError.
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popitem() => Remove and return an arbitary item (key, value). Raises KeyError if the dictionary is empty.
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setdefault(key[,d]) => If key is in the dictionary, return its value. If not, insert key with a value of d and return d (defaults to None).
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update([other]) => Update the dictionary with the key/value pairs from other, overwriting existing keys.
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values() => Return a new view of the dictionary's values
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'''
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# Map two lists into a dictionary in Python
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keys = ['a', 'b', 'c']
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values = [1, 2, 3]
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my_dict = dict(zip(keys, values))
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print(my_dict) # {'a': 1, 'b': 2, 'c': 3}
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## OR
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my_dict = dict((k, v) for k, v in zip(keys, values))
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print(my_dict) # {'a': 1, 'b': 2, 'c': 3}
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d = {'a0': [1, 2, 3], 'a1': [4, 5, 6]}
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my_dict = zip(*d.values())
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print(*my_dict) # (1, 4) (2, 5) (3, 6)
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x = ['1', '2', '3', '4']
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y = [[1,0],[2,0],[3,0],[4,]]
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my_dict = {key:value for key, value in zip(x,y)}
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print(my_dict) # {'1': [1, 0], '2': [2, 0], '3': [3, 0], '4': [4]}
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### Make a dictionary in Python from input values
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strs="""A1023 CRT
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A1029 Regulator
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A1030 Therm"""
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my_dict = dict(x.split() for x in strs.splitlines())
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print(my_dict) # {'A1023': 'CRT', 'A1029': 'Regulator', 'A1030': 'Therm'}
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#####
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n = int(input()) #n is the number of items you want to enter
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d ={}
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for i in range(n):
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text = input().split() #split the input text based on space & store in the list 'text'
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d[text[0]] = text[1] #assign the 1st item to key and 2nd item to value of the dictionary
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print(d)
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'''
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Input:
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3
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A1023 CRT
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A1029 Regulator
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A1030 Therm
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Output:
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{'A1023': 'CRT', 'A1029': 'Regulator', 'A1030': 'Therm'}
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'''
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'''Important Link:
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(1) Add new keys to a dictionary? (https://stackoverflow.com/questions/1024847/add-new-keys-to-a-dictionary)
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(2) Map two lists into a dictionary in Python (https://stackoverflow.com/questions/209840/map-two-lists-into-a-dictionary-in-python)
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(3) zip two values from the dictionary in Python (https://stackoverflow.com/questions/32222563/zip-two-values-from-the-dictionary-in-python)
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(4) Python equivalent of zip for dictionaries (https://stackoverflow.com/questions/16458340/python-equivalent-of-zip-for-dictionaries)
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(5) Make a dictionary in Python from input values (https://stackoverflow.com/questions/14147369/make-a-dictionary-in-python-from-input-values)
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'''
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'''
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** You are now able to solve following online-judge problems.
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_____________________________________________________________
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(1) HackerRank | DefaultDict Tutorial
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(2) HackerRank | Tuples
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'''
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