Q : What will be the output of the following code snippets?
In [ ]:
a=[1,2,3,4,5,6,7,8,9]
print(a[::2])
In [ ]:
a=[1,2,3,4,5,6,7,8,9]
a[::2]=10,20,30,40,50,60 # a[0], a[2],... = 10,20,30
print(a)
In [ ]:
a=[1,2,3,4,5,6,7,8,9]
a[::2]=10,20,30,40,50
print(a)
In [ ]:
a=[1,2,3,4,5]
a[3:1:-1]
In [ ]:
a=[1,2,3,4,5]
print(a[3:0:-1])
In [ ]:
arr = [[1, 2, 3, 4],
[4, 5, 6, 7],
[8, 9, 10, 11],
[12, 13, 14, 15]]
for i in range(0, 4):
print(arr[i].pop())
In [ ]:
arr = [1, 2, 3, 4, 5, 6]
for i in range(1, 6):
arr[i - 1] = arr[i]
for i in range(0, 6):
print(arr[i], end = " ")
In [ ]:
nums = set([1,1,2,3,3,3,4])
print(len(nums))
In [ ]:
numbers = [1, 2, 3, 4]
numbers.append([5,6,7,8])
print (len(numbers))
In [ ]:
numbers = [1, 2, 3, 4]
for a in [5,6,7,8]:
numbers.append(a)
print (len(numbers))
In [ ]:
numbers = [1, 2, 3, 4]
for a in range(5,9):
numbers.append(a)
print (len(numbers))
In [ ]:
names1 = ['Amir', 'Barry', 'Chales', 'Dao']
names2 = names1
names3 = names1[:]
names2[0] = 'Alice'
names3[1] = 'Bob'
sum = 0
for ls in (names1, names2, names3):
if ls[0] == 'Alice':
sum += 1
if ls[1] == 'Bob':
sum += 10
print(sum)
In [ ]:
names1 = ['Amir', 'Barry', 'Chales', 'Dao']
loc = names1.index("Edward")
print (loc)
In [ ]:
list1 = [1, 2, 3, 4]
list2 = [5, 6, 7, 8]
print (len(list1 + list2))
In [ ]:
list1 = [1, 2, 3, 8, 4]
list2 = [5, 6, 7, 8, 2]
print(len(set(list1 + list2)))
Q: Write a Python script to add key to a dictionary.
e.g. Sample Dictionary : {0: 10, 1: 20} Expected Result : {0: 10, 1: 20, 2: 30}
In [ ]:
a = {0: 10, 1: 20}
a[2] = 30
print(a)
Q: Write a Python script to concatenate following dictionaries to create a new one.
e.g:
Sample Dictionary : dic1={1:10, 2:20} dic2={3:30, 4:40} dic3={5:50,6:60}
Expected Result : {1: 10, 2: 20, 3: 30, 4: 40, 5: 50, 6: 60}
In [ ]:
names1={1:10, 2:20}
names2={3:30, 4:40}
names3={5:50,6:60}
# names1.update(names2)
new_dict = {}
for ls in (names1, names2, names3):
new_dict.update(ls)
print(new_dict)
In [ ]:
d1={1:2,3:4}
d2={5:6,7:9}
d3={10:8,13:22}
d4 = dict(d1)
d4.update(d2)
d4.update(d3)
print(d4)
Q: Write a Python script to check if a given key already exists in a dictionary.
In [ ]:
dict = {1: 2, 3: 4, 5: 6, 7: 9, 10: 8, 13: 22}
found = True
for key in dict:
if(key == 11):
print("key found")
break;
else:
print("key not found")
found = False
Q: Write a Python program to iterate over dictionaries using for loops. ans: please look above examples
Q: Write a Python script to generate and print a dictionary that contains number (between 1 and n) in the form (x, x*x).
Sample Dictionary ( n = 5) : Expected Output : {1: 1, 2: 4, 3: 9, 4: 16, 5: 25}
and
Write a Python script to print a dictionary where the keys are numbers between 1 and 15 (both included) and the values are square of keys. Sample Dictionary {1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6: 36, 7: 49, 8: 64, 9: 81, 10: 100, 11: 121, 12: 144, 13: 169, 14: 196, 15: 225}
In [ ]:
a = { b : b*b for b in range(1,10) }
print(a)
Q: Write a Python script to sort (ascending and descending) a dictionary by value.
In [1]:
# Ans
e = {1:39,8:110, 4:34, 3:87, 7:110, 2:87}
sortE = sorted(e.items(), key=lambda value: value[1])
print(sortE)
In [3]:
# Ans
e = {1:39,8:110, 4:34, 3:87, 7:110, 2:87}
sortE = sorted(e.items(), key=lambda value: value[1], reverse=True)
print(sortE)
Q: Write a Python script to merge two Python dictionaries.
TIP: use
update
Q: Write a Python program to sum all the items in a dictionary.
In [ ]:
e = {1:39,8:110, 4:34, 3:87, 7:110, 2:87}
Write a Python program to multiply all the items in a dictionary.
Write a Python program to remove a key from a dictionary.
Write a Python program to map two lists into a dictionary.
Write a Python program to sort a dictionary by key.
Write a Python program to get the maximum and minimum value in a dictionary.
Write a Python program to get a dictionary from an object's fields.
Write a Python program to remove duplicates from Dictionary.
Write a Python program to check a dictionary is empty or not.
Write a Python script to sort (ascending and descending) a dictionary by value.