Python Coding Exercise-Swapping first and Last element in a list

In [13]:

from IPython.core.display import display, HTML
display(HTML("<style>.container { width:103% !important;margin-left: -2%; }</style>"))

interchange first and last elements in a list¶

In [2]:

l1=[1,2,3,4,5]
l1

Out[2]:

[1, 2, 3, 4, 5]

In [6]:

# Getting the first element
temp_first=l1[0]
temp_first

Out[6]:

1

In [7]:

# Getting the last element
temp_last=l1[len(l1)-1]
temp_last

Out[7]:

5

In [8]:

# Swapping values
l1[0]=temp_last
l1[len(l1)-1]=temp_first

In [9]:

# Printing the list
l1

Out[9]:

[5, 2, 3, 4, 1]

Creating a function to perform this swapping¶

In [10]:

def swapping_element(L1):
    l1=[]
    l1=L1
    temp_first=l1[0]
    temp_last=l1[len(l1)-1]
    
    # Swapping values
    l1[0]=temp_last
    l1[len(l1)-1]=temp_first
    
    return(l1)
    

In [11]:

swapping_element([1,2,3])

Out[11]:

[3, 2, 1]

In [12]:

swapping_element([12,17,20])

Out[12]:

[20, 17, 12]