Dictionary/Dictionary.ipynb

{"nbformat":4,"nbformat_minor":0,"metadata":{"colab":{"name":"Dictionary.ipynb","provenance":[],"collapsed_sections":[],"authorship_tag":"ABX9TyM9bBsZcTS8gSw0l4k5KgUz"},"kernelspec":{"name":"python3","display_name":"Python 3"}},"cells":[{"cell_type":"markdown","metadata":{"id":"d6ql3sEGZb4_"},"source":["### **Dictionary**\r\n","\r\n","Dictionary in python is `Mutable` and `Unordered` colletion of data values. It is used to store data values like `{key:value}` pair unlike other data structure which hold only single value as an element.\r\n","\r\n","key:value is provided in the dictionary to make it more optimized as we work on real life projects many times our data will be stored in the form of json file and when the data is stored in the form of jason file you need to have a way to quickly access it .\r\n","\r\n","*Dictionary have the following properties :*\r\n","- Dictionary is enclosed in {}\r\n","- The elements of a dictionary are not accessed using an index but with the help of the key such as dictname[\"key\"].\r\n","- Dictionary can be used to save anything such as other lists, dictionaries,....\r\n","- Dictionary can be nested.\r\n","- A dict is also known as a hash map or associative array."]},{"cell_type":"markdown","metadata":{"id":"3bs4DlrfZmHL"},"source":["### Creating a dictionary "]},{"cell_type":"code","metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"fYlV45OGZLHG","executionInfo":{"status":"ok","timestamp":1615201060845,"user_tz":-330,"elapsed":1030,"user":{"displayName":"Astha sharma","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14GgjBLrR6DUnxpbLqDlWd3dkr9DLqcLs3VpE4XazDw=s64","userId":"17723680383640633227"}},"outputId":"fc519b36-04d0-4549-d3a8-ab338da7de32"},"source":["Dict1 = {}     # dict = {} # tuples = () # list = []\r\n","print(\"Dict1 is of type {}\".format(type(Dict1)))\r\n","Dict2 = dict()\r\n","print(\"This is the second method to create {}\".format(type(Dict2)))\r\n","Dict2 = {'name':'Eva' , 'age': 20}\r\n","print(Dict2)"],"execution_count":8,"outputs":[{"output_type":"stream","text":["Dict1 is of type <class 'dict'>\n","This is the second method to create <class 'dict'>\n","{'name': 'Eva', 'age': 20}\n"],"name":"stdout"}]},{"cell_type":"code","metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"FqhyAlCvaKrb","executionInfo":{"status":"ok","timestamp":1615201098295,"user_tz":-330,"elapsed":820,"user":{"displayName":"Astha sharma","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14GgjBLrR6DUnxpbLqDlWd3dkr9DLqcLs3VpE4XazDw=s64","userId":"17723680383640633227"}},"outputId":"a4abd88c-1bdc-4487-d94d-702089ec501d"},"source":["transaction={'employee1':{'name':'Eva','products':[\"p1\",\"p2\",\"p3\"]},'employee2':{'name':'Ved','products':[\"p1\",\"p7\"]}}\r\n","transaction"],"execution_count":10,"outputs":[{"output_type":"execute_result","data":{"text/plain":["{'employee1': {'name': 'Eva', 'products': ['p1', 'p2', 'p3']},\n"," 'employee2': {'name': 'Ved', 'products': ['p1', 'p7']}}"]},"metadata":{"tags":[]},"execution_count":10}]},{"cell_type":"code","metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"f01snS5ybUMI","executionInfo":{"status":"ok","timestamp":1615201268899,"user_tz":-330,"elapsed":994,"user":{"displayName":"Astha sharma","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14GgjBLrR6DUnxpbLqDlWd3dkr9DLqcLs3VpE4XazDw=s64","userId":"17723680383640633227"}},"outputId":"4f31591c-1419-4518-b087-62a536bddfdc"},"source":["Dict_keys = ['name', 'age','gender']\r\n","Dict_values = ['Eva',20,'F']\r\n","\r\n","D = dict(zip(Dict_keys, Dict_values))\r\n","\r\n","print(D)"],"execution_count":11,"outputs":[{"output_type":"stream","text":["{'name': 'Eva', 'age': 20, 'gender': 'F'}\n"],"name":"stdout"}]},{"cell_type":"code","metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"iDihaqnVb65r","executionInfo":{"status":"ok","timestamp":1615201282144,"user_tz":-330,"elapsed":842,"user":{"displayName":"Astha sharma","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14GgjBLrR6DUnxpbLqDlWd3dkr9DLqcLs3VpE4XazDw=s64","userId":"17723680383640633227"}},"outputId":"40173e4f-a39e-4c13-9739-7f721301df55"},"source":["D_a = ['name', 'age']\r\n","D_b = ['eva', 20]\r\n","t1 = zip(D_a, D_b)\r\n","print(t1)\r\n","for x in t1:\r\n","    print(type(x))\r\n","    print(x)"],"execution_count":12,"outputs":[{"output_type":"stream","text":["<zip object at 0x7f44c40e3b40>\n","<class 'tuple'>\n","('name', 'eva')\n","<class 'tuple'>\n","('age', 20)\n"],"name":"stdout"}]},{"cell_type":"markdown","metadata":{"id":"WQwFcdLvc12F"},"source":["zip creates a list of pairs (or n-tuples if more than two lists provided). Very useful in a wide variety of applications, especially walking through two lists simultaneously."]},{"cell_type":"markdown","metadata":{"id":"d0m_CCAzc69b"},"source":["### Accessing elements in a dictionary"]},{"cell_type":"code","metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"pw5pmI7DcvRC","executionInfo":{"status":"ok","timestamp":1615201297923,"user_tz":-330,"elapsed":857,"user":{"displayName":"Astha sharma","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14GgjBLrR6DUnxpbLqDlWd3dkr9DLqcLs3VpE4XazDw=s64","userId":"17723680383640633227"}},"outputId":"d67dc42a-d4c7-4176-9f3a-964937210f2e"},"source":["Dict = {'name':'Eva', 'age': 20}\r\n","\r\n","print(Dict)\r\n","print(Dict.keys())\r\n","print(Dict['age'])\r\n","print(Dict['name'])"],"execution_count":13,"outputs":[{"output_type":"stream","text":["{'name': 'Eva', 'age': 20}\n","dict_keys(['name', 'age'])\n","20\n","Eva\n"],"name":"stdout"}]},{"cell_type":"code","metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"em_kIYDwesxQ","executionInfo":{"status":"ok","timestamp":1615201328716,"user_tz":-330,"elapsed":699,"user":{"displayName":"Astha sharma","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14GgjBLrR6DUnxpbLqDlWd3dkr9DLqcLs3VpE4XazDw=s64","userId":"17723680383640633227"}},"outputId":"6a4f757f-5093-41ff-b411-e08f4dc3498f"},"source":["Dict2 = {'emp': Dict}\r\n","\r\n","print(Dict2)\r\n","\r\n","print(Dict2['emp']['age'])"],"execution_count":14,"outputs":[{"output_type":"stream","text":["{'emp': {'name': 'Eva', 'age': 20}}\n","20\n"],"name":"stdout"}]},{"cell_type":"markdown","metadata":{"id":"aSY1N4SqgUI6"},"source":["### Adding and changing elements of dictionary"]},{"cell_type":"code","metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"IYwvqcz8e_DH","executionInfo":{"status":"ok","timestamp":1615202246896,"user_tz":-330,"elapsed":731,"user":{"displayName":"Astha sharma","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14GgjBLrR6DUnxpbLqDlWd3dkr9DLqcLs3VpE4XazDw=s64","userId":"17723680383640633227"}},"outputId":"9db8d9a8-d2bc-4ff3-f14e-b52f2f7772bb"},"source":["car = {'brand': 'ford', 'model': 'Mustang', 'year': '1964'}\r\n","print(car)\r\n","# adding new element in dictionary\r\n","car['color'] = 'black'\r\n","print(car)\r\n","# changing the exsisting value \r\n","car['model'] = 'figo'\r\n","print(car)"],"execution_count":16,"outputs":[{"output_type":"stream","text":["{'brand': 'ford', 'model': 'Mustang', 'year': '1964'}\n","{'brand': 'ford', 'model': 'Mustang', 'year': '1964', 'color': 'black'}\n","{'brand': 'ford', 'model': 'figo', 'year': '1964', 'color': 'black'}\n"],"name":"stdout"}]},{"cell_type":"markdown","metadata":{"id":"OhktGedyjs1f"},"source":["### Deleting elements from a dictionary "]},{"cell_type":"code","metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"crB51T5ljQy7","executionInfo":{"status":"ok","timestamp":1615202627815,"user_tz":-330,"elapsed":1347,"user":{"displayName":"Astha sharma","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14GgjBLrR6DUnxpbLqDlWd3dkr9DLqcLs3VpE4XazDw=s64","userId":"17723680383640633227"}},"outputId":"e37ad727-5917-4b19-a2d4-3e5bf4d80b1a"},"source":["car = {'brand':'ford','model':'Mustang','year':1964,'color':'black'}\r\n","print(car)\r\n","# deleting element from dictionary \r\n","del car['year']\r\n","print(car)"],"execution_count":17,"outputs":[{"output_type":"stream","text":["{'brand': 'ford', 'model': 'Mustang', 'year': 1964, 'color': 'black'}\n","{'brand': 'ford', 'model': 'Mustang', 'color': 'black'}\n"],"name":"stdout"}]},{"cell_type":"markdown","metadata":{"id":"Poiwz5M2lHgB"},"source":["### Some built-in methods which can be used on dictionaries "]},{"cell_type":"markdown","metadata":{"id":"-baHIiQklhkR"},"source":["- **keys()** - Returns a list containing the dictionary's keys\r\n"]},{"cell_type":"code","metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"qvvHFHLplClo","executionInfo":{"status":"ok","timestamp":1615205668353,"user_tz":-330,"elapsed":731,"user":{"displayName":"Astha sharma","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14GgjBLrR6DUnxpbLqDlWd3dkr9DLqcLs3VpE4XazDw=s64","userId":"17723680383640633227"}},"outputId":"170d73da-0e4e-46d1-8709-8bcf16e1a0e4"},"source":["Movies = {'Name':'inception',\r\n","          'Genre':'sci-fi',\r\n","          'Release_yr':2010,\r\n","          'Director':' Christopher Nolan'}\r\n","print(Movies)\r\n","print(Movies.keys())"],"execution_count":24,"outputs":[{"output_type":"stream","text":["{'Name': 'inception', 'Genre': 'sci-fi', 'Release_yr': 2010, 'Director': ' Christopher Nolan'}\n","dict_keys(['Name', 'Genre', 'Release_yr', 'Director'])\n"],"name":"stdout"}]},{"cell_type":"markdown","metadata":{"id":"30SGT-Ppna2O"},"source":["- **values()** - Returns a list of all the values in the dictionary."]},{"cell_type":"code","metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"K1GiDLK9m_2_","executionInfo":{"status":"ok","timestamp":1615203350755,"user_tz":-330,"elapsed":1320,"user":{"displayName":"Astha sharma","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14GgjBLrR6DUnxpbLqDlWd3dkr9DLqcLs3VpE4XazDw=s64","userId":"17723680383640633227"}},"outputId":"0fa10e76-d1ae-4919-e1b1-51f900a4d5f4"},"source":["Movies = {'Name':'inception',\r\n","          'Genre':'sci-fi',\r\n","          'Release_yr':2010,\r\n","          'Director':' Christopher Nolan'}\r\n","print(Movies)\r\n","print(Movies.values())"],"execution_count":21,"outputs":[{"output_type":"stream","text":["{'Name': 'inception', 'Genre': 'sci-fi', 'Release_yr': 2010, 'Director': ' Christopher Nolan'}\n","dict_values(['inception', 'sci-fi', 2010, ' Christopher Nolan'])\n"],"name":"stdout"}]},{"cell_type":"markdown","metadata":{"id":"-Q78T22Zn98C"},"source":["- **items()** - Returns a list containing a tuple for each key value pair."]},{"cell_type":"code","metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"9frFRwJTny9f","executionInfo":{"status":"ok","timestamp":1615203505236,"user_tz":-330,"elapsed":686,"user":{"displayName":"Astha sharma","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14GgjBLrR6DUnxpbLqDlWd3dkr9DLqcLs3VpE4XazDw=s64","userId":"17723680383640633227"}},"outputId":"7320e521-9c5e-432c-a7f9-bd7eeecd4ba0"},"source":["Movies = {'Name':'inception',\r\n","          'Genre':'sci-fi',\r\n","          'Release_yr':2010,\r\n","          'Director':' Christopher Nolan'}\r\n","print(Movies)\r\n","print(Movies.items())"],"execution_count":22,"outputs":[{"output_type":"stream","text":["{'Name': 'inception', 'Genre': 'sci-fi', 'Release_yr': 2010, 'Director': ' Christopher Nolan'}\n","dict_items([('Name', 'inception'), ('Genre', 'sci-fi'), ('Release_yr', 2010), ('Director', ' Christopher Nolan')])\n"],"name":"stdout"}]},{"cell_type":"markdown","metadata":{"id":"ygnrhC8joulV"},"source":["- **copy()** - Returns a copy of the specified dictionary. With copy, they don't point to the same dictionary anymore, a new copy is created."]},{"cell_type":"code","metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"QaRjdyqovbu-","executionInfo":{"status":"ok","timestamp":1615205592369,"user_tz":-330,"elapsed":949,"user":{"displayName":"Astha sharma","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14GgjBLrR6DUnxpbLqDlWd3dkr9DLqcLs3VpE4XazDw=s64","userId":"17723680383640633227"}},"outputId":"4da89503-e2ed-4d8c-cd6b-043a591c5128"},"source":["Movies = {'Name':'inception',\r\n","          'Genre':'sci-fi',\r\n","          'Release_yr':2010,\r\n","          'Director':' Christopher Nolan'}\r\n","\r\n","cpy = Movies.copy()\r\n","print(cpy)"],"execution_count":23,"outputs":[{"output_type":"stream","text":["{'Name': 'inception', 'Genre': 'sci-fi', 'Release_yr': 2010, 'Director': ' Christopher Nolan'}\n"],"name":"stdout"}]},{"cell_type":"markdown","metadata":{"id":"sSSBEuBxw4kc"},"source":["- **clear()** - Removes all the elements from the dictionary."]},{"cell_type":"code","metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"yiZp0Fp-oY2t","executionInfo":{"status":"ok","timestamp":1615206033774,"user_tz":-330,"elapsed":763,"user":{"displayName":"Astha sharma","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14GgjBLrR6DUnxpbLqDlWd3dkr9DLqcLs3VpE4XazDw=s64","userId":"17723680383640633227"}},"outputId":"1babf220-0d02-4cfa-afbc-68be0eab2b26"},"source":["song = {'Name':'one moment in time',\r\n","        'artist':'whitney houston',\r\n","        'genre':'pop'}\r\n","print(song)\r\n","\r\n","song.clear()\r\n","print(song)"],"execution_count":25,"outputs":[{"output_type":"stream","text":["{'Name': 'one moment in time', 'artist': 'whitney houston', 'genre': 'pop'}\n","{}\n"],"name":"stdout"}]},{"cell_type":"markdown","metadata":{"id":"ISJEuNKfyMUO"},"source":["- **get()** - Returns the value of the specified key.equivalent to `dict['key']`"]},{"cell_type":"code","metadata":{"colab":{"base_uri":"https://localhost:8080/","height":82},"id":"kIW_DTggyCNR","executionInfo":{"status":"ok","timestamp":1615206328346,"user_tz":-330,"elapsed":939,"user":{"displayName":"Astha sharma","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14GgjBLrR6DUnxpbLqDlWd3dkr9DLqcLs3VpE4XazDw=s64","userId":"17723680383640633227"}},"outputId":"083f5e27-f981-4fbd-95de-ffcfe2992787"},"source":["Movies = {'Name':'inception',\r\n","          'Genre':'sci-fi',\r\n","          'Release_yr':2010,\r\n","          'Director':' Christopher Nolan'}\r\n","print(Movies)\r\n","Movies.get('Name')"],"execution_count":27,"outputs":[{"output_type":"stream","text":["{'Name': 'inception', 'Genre': 'sci-fi', 'Release_yr': 2010, 'Director': ' Christopher Nolan'}\n"],"name":"stdout"},{"output_type":"execute_result","data":{"application/vnd.google.colaboratory.intrinsic+json":{"type":"string"},"text/plain":["'inception'"]},"metadata":{"tags":[]},"execution_count":27}]},{"cell_type":"markdown","metadata":{"id":"5JIhu_gOzMrp"},"source":["- **pop()** - Removes the element with the specified key"]},{"cell_type":"code","metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"eniquIl9zESI","executionInfo":{"status":"ok","timestamp":1615206893334,"user_tz":-330,"elapsed":752,"user":{"displayName":"Astha sharma","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14GgjBLrR6DUnxpbLqDlWd3dkr9DLqcLs3VpE4XazDw=s64","userId":"17723680383640633227"}},"outputId":"371d7fc4-a652-453e-a0f5-d9652df8660e"},"source":["song1 = {'Name':'one moment in time',\r\n","        'artist':'whitney houston',\r\n","        'genre':'pop',\r\n","        'rel_yr':1988}\r\n","print(song1)\r\n","\r\n","song1.pop('rel_yr')\r\n","print(song1)"],"execution_count":31,"outputs":[{"output_type":"stream","text":["{'Name': 'one moment in time', 'artist': 'whitney houston', 'genre': 'pop', 'rel_yr': 1988}\n","{'Name': 'one moment in time', 'artist': 'whitney houston', 'genre': 'pop'}\n"],"name":"stdout"}]},{"cell_type":"markdown","metadata":{"id":"KrpIvBhl1YNl"},"source":["- **update()** - Updates the dictionary with the specified key-value pairs."]},{"cell_type":"code","metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"dB6rUgbTzzzJ","executionInfo":{"status":"ok","timestamp":1615207632840,"user_tz":-330,"elapsed":1071,"user":{"displayName":"Astha sharma","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14GgjBLrR6DUnxpbLqDlWd3dkr9DLqcLs3VpE4XazDw=s64","userId":"17723680383640633227"}},"outputId":"135d2d08-1bb7-48c8-8f31-bb57ec123d19"},"source":["car = {'brand':'ford',\r\n","       'model':'Mustang',\r\n","       'year':1964,\r\n","       'color':'black'}\r\n","print(car) \r\n","\r\n","car.update({'color':'white'})\r\n","print(car)"],"execution_count":33,"outputs":[{"output_type":"stream","text":["{'brand': 'ford', 'model': 'Mustang', 'year': 1964, 'color': 'black'}\n","{'brand': 'ford', 'model': 'Mustang', 'year': 1964, 'color': 'white'}\n"],"name":"stdout"}]},{"cell_type":"markdown","metadata":{"id":"alOviv5q5By1"},"source":["- **len()** - Returns the number of Key/Value pairs."]},{"cell_type":"code","metadata":{"colab":{"base_uri":"https://localhost:8080/"},"id":"OFsnpom03spa","executionInfo":{"status":"ok","timestamp":1615208047726,"user_tz":-330,"elapsed":814,"user":{"displayName":"Astha sharma","photoUrl":"https://lh3.googleusercontent.com/a-/AOh14GgjBLrR6DUnxpbLqDlWd3dkr9DLqcLs3VpE4XazDw=s64","userId":"17723680383640633227"}},"outputId":"1373a900-4b0a-4e81-9e5b-a4ff30169a40"},"source":["car = {'brand':'ford',\r\n","       'model':'Mustang',\r\n","       'year':1964,\r\n","       'color':'black'}\r\n","print(car)\r\n","\r\n","print(len(car))"],"execution_count":36,"outputs":[{"output_type":"stream","text":["{'brand': 'ford', 'model': 'Mustang', 'year': 1964, 'color': 'black'}\n","4\n"],"name":"stdout"}]},{"cell_type":"code","metadata":{"id":"vwPNnrwF5eYU"},"source":[""],"execution_count":null,"outputs":[]}]}