completing Dictionary

Author: enrituraj

Dictionary/Practice.py

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+salary_data = {
+    "John": 7000,
+    "Rahul": 10000,
+    "Manoj": 500000,
+    "Raj": 80000,
+    "Aman": 40000,
+}
+

Dictionary/dictionary _copy.py

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+user = {
+    "name" : "john",
+    "age": 40,
+    "password": "pass123"
+}
+
+# both are same
+user_data = user.copy()
+# user_data = dict(user_data)
+
+user_data["age"] = 41
+
+print(user_data["age"]) # 41
+print(user["age"]) # 40

Dictionary/dictionary.py

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+# salary_data =  dict(
+#                     John= 7000,
+#                     Rahul= 10000,
+#                     Manoj= 500000,
+#                     Raj= 80000,
+#                     Aman= 40000
+#                 )
+
+salary_data = {
+    "John": 7000,
+    "Rahul": 10000,
+    "Manoj": 500000,
+    "Raj": 80000,
+    "Aman": 40000,
+}
+
+# printing key of a dict
+for key in salary_data:
+    print(key)
+
+for key in salary_data.keys():
+    print(key)
+
+# printing values of a dict
+for key in salary_data:
+    print(salary_data[key])
+
+for val in salary_data.values():
+    print(val)
+
+# printing both item
+for key,val in salary_data.items():
+    print(f"{key}:{val}")

Dictionary/dictionary_methods.py

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+user = {
+    "name" : "john",
+    "age": 40,
+    "password": "pass123"
+}
+
+# copy() :	Returns a copy of the dictionary
+user_copy = user.copy()
+print(user_copy)
+
+# clear() :	Removes all the elements from the dictionary
+user_copy.clear()
+print(user_copy)
+
+# fromkeys()	Returns a dictionary with the specified keys and value
+keys = ('name','age','password')
+val = None
+
+user_dict = dict.fromkeys(keys,val)
+print(user_dict)
+
+# or
+
+keys = ('name','age','password')
+user_dict = dict.fromkeys(keys)
+print(user_dict)
+
+# get()	Returns the value of the specified key
+print(f"name : {user.get('name')}")
+print(f"age : {user.get('age')}")
+
+
+# items()	Returns a list containing a tuple for each key value 
+for key,val in user.items():
+    print(f"{key} : {val}")
+
+
+# keys()	Returns a list containing the dictionary's keys
+print("printing all key")
+for key in user.keys():
+    print(key)
+
+
+# pop()	Removes the element with the specified key
+print("using pop() : ")
+print(user_dict)
+user_dict.pop("age")
+print(user_dict)
+
+
+# popitem()	Removes the last inserted key-value pair
+print("using popitem() : ")
+print(user_dict)
+user_dict.popitem()
+print(user_dict)
+
+
+# setdefault()	Returns the value of the specified key. If the key does not exist: insert the key, with the specified value
+user.setdefault("is_admin",False)
+print(user)
+
+# update()	Updates the dictionary with the specified key-value pairs
+# uodate existing value
+user.update({"is_admin":True})
+print(user)
+# help in adding new item
+user.update({"is_logged_in":True})
+print(user)
+
+
+# values()	Returns a list of all the values in the dictionary
+
+for val in user.values():
+    print(val)

Dictionary/dictionary_operations.py

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+employees_db = {
+    "101": "Rajesh Kumar",
+    "102": "Sita Patel",
+    "103": "Amit Sharma",
+    "104": "Priya Nair",
+    "105": "Vikram Singh",
+    "106": "Neha Gupta",
+    "107": "Arjun Mehta",
+    "108": "Anjali Rao"
+}
+# access item
+# access item with its key
+print(employees_db["101"])
+
+# change value
+employees_db["101"] = "Raj kumar"
+print(employees_db["101"])
+
+employees_db.update({"101":"Rajesh kumar"})
+print(employees_db["101"])
+
+
+# add item
+employees_db["109"] = "Muskan kumari"
+print(employees_db["109"])
+
+employees_db.update({"110":"Puja kumari"})
+print(employees_db["110"])
+
+# Remove item
+employees_db.pop("110") # remove user with id 110
+employees_db.popitem() # remove user with id 109 or last one
+
+print(employees_db)

Dictionary/nested_dictionary.py

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+last_login= {
+    "01-01-2000": {
+        "location": "london",
+        "time": "5pm",
+        "session_time": "45m"
+    },
+    "02-01-2000":{
+        "location": "london",
+        "time": "8pm",
+        "session_time": "15m"
+    },
+}
+
+print(last_login["01-01-2000"]["session_time"])
+
+for key,val in last_login.items():
+    print(f"Date ( {key} ) : {val}")
+
+    print("-"*32)
+
+    for key1,val1 in val.items():
+        print(f"{key1} : {val1}")
+        
+    print("-"*32)
+