Python Dictionary Methods

get() Method

Python Dictionary get() Method return the value for the given key if present in the dictionary.
If not, then it will return None (if get() is used with only one argument).
Example:

dic = {
    "hello":"world",
    "python":"program",
    "learn":"python"
    }
a = dic.get("python")
print(a)
b = dic.get("hello")
print(b)

fromkeys() Method

The fromkeys() method returns a dictionary with the specified keys and the specified value.
Example:

x = ("a","b","c")
y = 1
newdict1 = dict.fromkeys(x)
newdict2 = dict.fromkeys(x,y)
print(newdict1)
print(newdict2)

copy() Method

Python Dictionary copy() method returns a shallow copy of the dictionary.
Example:

s = {
    "hello":"world",
    "python":"program",
    "learn":"python"
    }
snew = s.copy()
print(snew)

setdefault() Method

The setdefault() method returns the value of the item with the specified key.
If the key does not exist, insert the key, with the specified value, see example below.
Example:

s = {
    "hello":"world",
    "python":"program",
    "learn":"python"
    }
s1 = s.setdefault("learn","telugu")
print(s1)
print(s)
s2 = s.setdefault("physics","maths")
print(s2)
print(s)

update() Method

Python Dictionary update() method updates the dictionary with the elements from another dictionary object or from an iterable of key/value pairs.
Example:

s = {
    "hello":"world",
    "python":"program",
    "learn":"python"
    }
s.update({"physics":"maths"})
print(s)

clear() Method

The clear() method removes all items from the dictionary.
Example:

s = {
    "hello":"world",
    "python":"program",
    "learn":"python"
    }
print(s)
s.clear()
print(s)

pop() Method

Python dictionary pop() method removes and returns the specified element from the dictionary.
Example:

s = {
    "hello":"world",
    "python":"program",
    "learn":"python"
    }
print(s)
s.pop("hello")
print(s)

popitem() Method

Python dictionary popitem() method removes the last inserted key-value pair from the dictionary and returns it as a tuple.
Example:

s = {
    "hello":"world",
    "python":"program",
    "learn":"python"
    }
print(s)
s.popitem()
print(s)
s.popitem()
print(s)

keys() Method

The keys() method in Python Dictionary, returns a view object that displays a list of all the keys in the dictionary in order of insertion using Python.
Example:

s = {
    "hello":"world",
    "python":"program",
    "learn":"python"
    }
key = s.keys()
print(key)
s["physics"] = "maths"
print(key)

values() Method

values() is an inbuilt method in Python programming language that returns a view object.
The view object contains the values of the dictionary, as a list.
If you use the type() method on the return value, you get “dict_values object”. It must be cast to obtain the actual list.
Example:

s = {
    "hello":"world",
    "python":"program",
    "learn":"python"
    }
val = s.values()
print(val)
s["physics"] = "maths"
print(val)
s["learn"] = "telugu"
print(val)

items() Method

Dictionary in Python is an unordered collection of data values, used to store data values like a map, which unlike other Data Types that hold only single value as an element, Dictionary holds key : value pair.
In Python Dictionary, items() method is used to return the list with all dictionary keys with values.
Example:

s = {
    "hello":"world",
    "python":"program",
    "learn":"python"
    }
item = s.items()
print(item)