Python list sort() function is used to sort a list in ascending, descending or user defined order.
To sort the list in ascending order
List_name.sort()
This will sort the given list in ascending order.
This function is used to sort list of integers, floating point number, string and others.
numbers = [8, 5, 7, 9]
# Sorting list of Integers in ascending
numbers.sort()
print(numbers)
Output
Example 2:
strs = ["wikitechy", "code", "ide", "practice"]
# Sorting list of Integers in ascending
strs.sort()
print(strs)
Output
['code', 'ide', 'practice', 'wikitechy']
To sort the list in descending order
Example:
list_name.sort(reverse=True)
This will sort the given list in descending order
numbers = [8, 5, 7, 9]
# Sorting list of Integers in descending
numbers.sort(reverse = True)
print(numbers)
Output
Sorting user using user defined order
list_name.sort(key=…, reverse=…) – it sorts according to user’s choice
Example
# Python program to demonstrate sorting by user's
# choice
# function to return the second element of the
# two elements passed as the parameter
def sortSecond(val):
return val[1]
# list1 to demonstrate the use of sorting
# using using second key
list1 = [(1, 2), (3, 3), (1, 1)]
# sorts the array in ascending according to
# second element
list1.sort(key = sortSecond)
print(list1)
# sorts the array in descending according to
# second element
list1.sort(key = sortSecond, reverse = True)
print(list1)
Output
[(1, 1), (1, 2), (3, 3)]
[(3, 3), (1, 2), (1, 1)]
