42)Sort_Listing_Program.py

# Sort List Alphanumerically
# List objects have a sort() method that will sort the list alphanumerically, ascending, by default:

# Example 
# Sort the list alphabetically:

thislist = ["orange","mango","cherry","banana","apple","custuradapple","grapes"]
thislist.sort()
print(thislist)

#####################################################################################################

# Sort the list numerically ascending 

Numbers = [30,50,80,10,36,29,45,69,89]
Numbers.sort()
print(Numbers)


#####################################################################################################

# Sort Descending
# To sort descending, use the keyword argument reverse = True:

#Example
#Sort the list descending:

thislist = ["orange","banana","apple","grapes","cherry","mango","custuirdapple"]
thislist.sort(reverse = True)
print(thislist)

##################################################################################

# Example
# Sort the list descending:

Numbers = [10,20,40,509,39,45,90,78,67,90.34]
Numbers.sort(reverse = True)
print(Numbers)

##################################################################################


# Customize Sort Function
# You can also customize your own function by using the keyword argument key = function.

# The function will return a number that will be used to sort the list (the lowest number first):

# Example
# Sort the list based on how close the number is to 50:

def myfunc(n):
    return abs(n - 50)

thislist = [100,50,65,82,23]
thislist.sort(key = myfunc)
print(thislist)

#######################################################################################


# Case Insensitive Sort
# By default the sort() method is case sensitive, resulting in all capital letters being sorted before lower case letters:

# Example
# Case sensitive sorting can give an unexpected result:

thislist = ["orange","banana","apple","Kiwi","Grapes"]
thislist.sort()
print(thislist)

########################################################################################

# So if you want a case-insensitive sort function, use str.lower as a key function:

# Example
# Perform a case-insensitive sort of the list:

thislist = ["banana","Orange","Kiwi","cherry"]
thislist.sort(key = str.lower)
print(thislist)

#######################################################################################

# Reverse Order
# What if you want to reverse the order of a list, regardless of the alphabet?

# The reverse() method reverses the current sorting order of the elements.

# Example
# Reverse the order of the list items:

thislist = ["banana","orange","grapes","apple","cherry"]
thislist.reverse()
print(thislist)