Learning Python- Day 6

DAY 6

dict1={
    "Abhi":"Noida",
    "Nitin":"Gr. Noida"
     }
print("Dict is",dict1)

run the function CTL+shift+fn+F10

Dict is {'Abhi': 'Noida', 'Nitin': 'Gr. Noida'}

In the above program, Abhi is the key and Noida is the value. Key and value will always be together in dictionary. The key is analogous to the index, they are like addresses but they don’t have to be

integers. They are usually characters; the values are

similar to the elements in a list and contain information.

To create a dictionary, we use curly brackets. The keys are the first elements; they must

be immutable and unique. Each key is followed by a value separated

by a colon. The values can be immutable, mutable and duplicates.

Each key and value pair is separated by a comma.

To add new value to the dictionary

dict1["Rohit"]="Delhi"
dict1["Tom"]="Pune"
dict1["John"]="Agra"
dict1["Joy"]="Jaipur"

Program:

dict1={
    "Abhi":"Noida",
    "Nitin":"Gr. Noida"
     }
dict1["Rohit"]="Delhi"
dict1["Tom"]="Pune"
dict1["John"]="Agra"
dict1["Joy"]="Jaipur"
print(dict1)

run the function CTL+shift+fn+F10

{'Abhi': 'Noida', 'Nitin': 'Gr. Noida', 'Rohit': 'Delhi', 'Tom': 'Pune', 'John': 'Agra', 'Joy': 'Jaipur'}

dict2=dict1.copy()
print("Dict2 is ",dict2)
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Dict2 is  {'Abhi': 'Noida', 'Nitin': 'Gr. Noida', 'Rohit': 'Delhi', 'Tom': 'Pune', 'John': 'Agra', 'Joy': 'Jaipur'}

print(dict2["Tom"])

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Pune

print(dict2.keys())

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dict_keys(['Abhi', 'Nitin', 'Rohit', 'Tom', 'John', 'Joy'])

print(dict2.values())

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dict_values(['Noida', 'Gr. Noida', 'Delhi', 'Pune', 'Agra', 'Jaipur'])

print(dict2.items())

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dict_items([('Abhi', 'Noida'), ('Nitin', 'Gr. Noida'), ('Rohit', 'Delhi'), ('Tom', 'Pune'), ('John', 'Agra'),

print(dict2.get("Nitin"))

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Gr. Noida

print(dict2.popitem())

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('Joy', 'Jaipur')

print(dict2.pop("Rohit"))

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Delhi

print(dict2)

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{'Abhi': 'Noida', 'Nitin': 'Gr. Noida', 'Tom': 'Pune', 'John': 'Agra'}

print("Nitin" in dict2)
print("Joy" in dict2)
print("Joy" not in dict2)

dict2.clear()
print(dict2)

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{}

del dict2
#print(dict2)

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   print(dict2)

NameError: name 'dict2' is not defined

for i in dict1.items():
    print(i)
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('Abhi', 'Noida')

('Nitin', 'Gr. Noida')

('Rohit', 'Delhi')

('Tom', 'Pune')

('John', 'Agra')

('Joy', 'Jaipur')

for i in dict1.keys():
    print(i)
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Abhi

Nitin

Rohit

Tom

John

Joy

for i in dict1.values():
    print(i)
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Noida

Gr. Noida

Delhi

Pune

Agra

Jaipur

for i,j in dict1.items():
    print(i,j)
run the function CTL+shift+fn+F10

Abhi Noida

Nitin Gr. Noida

Rohit Delhi

Tom Pune

John Agra

Joy Jaipur

SETS

Let’s cover sets; they are also a type of collection.Sets are a type of collection. This means that like lists and tuples, you can input different python types. Unlike lists and tuples they are unordered.This means sets do not record element position. Sets only have unique elements. This means there is only one of a particular element in a set.To define a set, you use curly brackets You place the elements of a set within the curly brackets. You notice there are duplicate items. When the actual set is created, duplicate items will not be present.

You can convert a list to a set by using the function set; this is called type-casting. You simply use the list as the input to the function set. The result will be a list converted to a set.

s1={10,20,30,40,50,10}
print(s1)
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{40, 10, 50, 20, 30}

s1.add(60)

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{40, 10, 50, 20, 60, 30}

s1.update([70,80,90])

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{70, 40, 10, 80, 50, 20, 90, 30}

print(len(s1))

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8
print(max(s1))

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90
print(min(s1))

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10

s1.remove(10)
print(s1)

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{70, 40, 80, 50, 20, 90, 30}

#s1.remove(100)
s1.discard(1000)

print(s1.pop())

print(100 in s1)
print(100 not in s1)

s2={10,20,30,40,50}
s3={40,50,60,70,80}

s4=s2.union(s3)
print(s4)

s5=s2.intersection(s3)
print(s5)

s6=s2.difference(s3)
print(s6)

s7=s2.symmetric_difference(s3)
print(s7)

print(s2,s3)

#s2.intersection_update(s3)
#s2.difference_update(s3)
s2.symmetric_difference_update(s3)
print(s2)


s8={10,20,30,40}
s9={30,40}
s10={50,60,70}

print(s9.issubset(s8))
print(s8.issuperset(s9))
print(s8.isdisjoint(s10))

Learning Python- Day 7