# Lexicographical Order in Python

Rana Hasnain Khan Apr 30, 2022

We will introduce `lexicographic order` in Python. We’ll also discuss different methods to achieve lexicographic order with examples.

## Lexicographic Order in Python

In math, the `lexicographic` or `lexicographical order` is the process of ordering a list of elements or an array of elements that are arranged alphabetically. The other term used for `lexicographic order` is `dictionary order`.

The lexicographic order has a variety of forms and generalizations that can be used. In simple words, lexicographic ordering is sorting words from a list or array based on their first letters.

If the initial letter is identical, the second letter is utilized to order the words. We may come across some situations in which we need to sort the data according to our requirements, and we’ll use lexicographical order to sort the data.

Let’s discuss `lexicographic order` with examples to understand it better. As shown below, we will create a sample list containing the names of some random things that we will sort using the `sort()` method.

Code:

``````# python
sampleData = ["Egg", "Milkshake", "Banana", "Apple"]
print("List before using Lexicographical Order: ", sampleData)

sampleData.sort()
print("List after using Lexicographical Order: ", sampleData)
``````

Output: Sorting the list above is done in alphabetical order.

In this next example, we’ll use a string instead of a list to apply `lexicographic order`. We will use the `split()` function to convert a string into a list and then use the `sort()` function.

Code:

``````# python
def LexicographicSort(sampleData):
Data = sampleData.split()
Data.sort()
for a in Data:
print ( a )

sampleData= "Let's try to sort this string into Lexicographical order"
print ("String before using Lexicographical Order: ", sampleData)
print ("String after using Lexicographical Order: ")

LexicographicSort(sampleData)
``````

Output: Using the `sort()` and `split()` functions we can sort the strings into `lexicographic order`.

## Sorting Numeric Lists Into Lexicographic Order in Python

We can also sort numerical lists using the `sort()` function. In this example, we will use a random array of numbers that we can sort using the `sort()` function.

Code:

``````# python
def LexicographNumberSort(RangedNum):
RangedNum.sort()
print (RangedNum)

RangedNum = [1, 4, 5, 3, 10, 16, 12]
print ("Sorted numbers: ")
LexicographNumberSort(RangedNum)
``````

Output: The `sort()` method can sort a list of numbers in lexicographic order.

Rana is a computer science graduate passionate about helping people to build and diagnose scalable web application problems and problems developers face across the full-stack.