In Python, How to return a copy of the list, return the max value in the list, flatten the list of lists to have only one level, e.g. >>> flatten([[1, 2], [3, 4], [5, 6]]) >>> [1, 2, 3, 4, 5, 6]
I want to solve the problem without a list comprehension and with a list comprehension to see the difference with comments to be able to understand it
#list comprehension can only be used in flattening the list.
There is no need to use it in
#finding maximum in list and creating the copy of list
#function which will flatten the list of list without a list
comprehension
def flat(l):
#declare an empty list output
output=[]
#outer loop run over the list l passed
for i in l:
#inner loop run over each element of l in each iteration
for j in i:
#append the individual element into the output list
output.append(j)
#print the output flattened list
print("Flattened list without using list comprehension:
",output)
#function which will flatten the list by using list
comprehension
def flat1(l1):
#declare an empty list output1
output1=[]
#list comprehension is basically reducing the space taken by the
code
#which will generate same result as the previous code
#Now here nested loops are same as previous one except that it is
written in same line
#loop will run and j is the individual element which will be
appended one by one in output1
#list in each iteration
output1=[j for i in l1 for j in i ]
#printing the list output1
print("Flattened list by using list comprehension: ",output1)
#function which will return the copy of the list passed
#this copy will be shallow copy so that changing the copy of
list
#does not change the original list l
def copy_list(l):
#using copy() method to create shallow copy of list l
return l.copy()
#function which will return the maximum number from the list
def max_list(l):
#setting m variable to first element of list
m=l[0]
#iterating over the list l
for i in l:
#if the element coming in iteration > the first element that is
m then
#m is changed to that iterated element
if(i>m):
m=i
#Atlast m will be the maximum element so it will be returned
return m
#defining a listof lists l
l=[[1,2],[3,4],[5,6]]
#passing it to flat function
flat(l)
#passing it to flat1 function
flat1(l)
#defining another list l1
l1=[34,82,51,67]
#calling function which will return the copy of the list passed and
storing it in l2
l2=copy_list(l1)
#printing l2
print("Copy of list: ",l2)
#using l2 copy of l1 to find maximum in it by calling the function
max_list
#and passing l2 to it
#max number returned gets printed
print("Maximum element of list: ",max_list(l2))
In Python, How to return a copy of the list, return the max value in the...
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