Python program: “List” related Questions
Data types :
Numbers in Python:
Integer, floating point numbers, Complex, Boolean.
Strings in Python:
A string is a sequence of characters. In Python single, double, and triple quotes are used to define strings.
List in Python:
Python list is an ordered sequence of items. We can store more than one item of different types in a list. Items in the list are accessed using an index.
Tuple in Python:
Tuple is an ordered sequence of items same as list. The difference is that tuples are immutable and list is mutable.
Python Set :
Set is an unordered collection of unique items, which means duplicates are not allowed. Set is defined using {} and items in set are separated by commas. set items are not ordered. Set items can’t be accessed using index as they are unordered, hence ‘indexing’ is NOT possible here. Repeated value is shown only ONCE. values gets sorted out
Dictionary in Python:
Is an unordered collection of key-value pairs. Is defined using {} and each item is a pair of keys and value.
Q: Break list into n chunks
alpha_list = [34, 23, 67, 100, 88, 2,15,23,8,19,91,34,21,0,45,21,72,32,4
n = 4
out = [alpha_list[i:i+n] for i in range(0,len(alpha_list),n)]
print(out)]
Q: Find the index of an item in a specified list
ip_lst = ['Red', 'Yellow','Green', 'White', 'Black', 'Pink', 'Yellow'
def specific_index_list(ip_lst, input_item):
count=-1
for i in ip_lst:
count+=1
if i == input_item:
break
return "index of {} is {}".format(input_item,count)
specific_index_list(ip_lst,'Yellow')]
Q: Split a list in N parts.
l = [1,2,3,4,5,6,7,8,9, 10
def custom_split_element(in_list, element_split):
return [in_list[i::element_split] for i in range(element_split)]
custom_split_element(l,2)]
Q: Write a Python program to multiply all the items in a list
lst = [1,3,17,-1
mlt = 1
for i in range(len(lst)):
mlt=mlt*lst[i]
print(mlt)]
Q: Write a Python program to multiply all the items in a list.
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mlt =
for i in range(2,5):
mlt *= i
print(mlt)1
Q: Write a Python program to get the largest number from a list.
lst = [10, 20, 4, 45, 99
print(max(lst))
lst.sort()
print("Number is:", lst[-1])]
Q: Find the k-th largest number in a sequence of unsorted numbers
def kLargest(arr, k)
arr.sort(reverse = True)
print(arr[k-1])
# Print the first kth largest elements
for i in range(k):
print (arr[i], end =" ")
nums = [56,14,7,98,32,12,11,50,45,78,7,5,69]
k = 3
kLargest(nums,k):
Q: Count number of strings where the string length is 2 or more and first and last characters are same
nums = ['abc', 'xyz', 'aba', '1221'
count = 0
for i in nums:
if len(i)>=2 and i[0] == i[-1]:
count += 1
print(count) #'aba', '1221']
Q: #convert list to dictionary
name = ['Suresh', 'Ramesh', 'Mahesh', 'Vikas', 'Prakash', 'Ram','Sita'
surname = ['Ram', 'Kumar', 'Paswan', 'Kumar', 'Padukone', 'Sita ','Singh']
d = {}
for i in name:
for j in surname:
d[i] = j
print(d)]
Q: Convert list of tuples into Dict
tups = [('vikas',30),('Gaurav',21),('Shaurya',99),('Siddhant',35)
tups
dict(tups)]
Q: Given a list of numbers, where every number shows up twice except for one number, find that one number
list_inp = [100, 75, 100, 20, 75, 12, 75, 25]
set_res = set(list_inp)
print("The unique elements of the input list using set():\n")
list_res = (list(set_res))
for item in list_res:
print(item)
Q: Get the frequency of the elements in a list
lst = [1,1,2,2,3,3,4,4,5,5,5,6,6,6,88
l = []
for j in set(lst):
l.append((j,lst.count(j)))
print(l)]
Q: Print a list of first and last 5 element’s square in range of numbers between 1 and 30 (both included).
lst = [i for i in range(1,31)
l = []
for j in lst[:5]+lst[-5:]:
l.append(j**2)
print(l)]
Q: To check whether a list contains a sub list
lst = [1,2,[3,4],[5,[100,200,['hello']],23,11],1,7
l = []
for i in lst:
if type(i)== list:
l.append(i)
print(l) ]