Python Alphabet | Ways to Initialize a List of the Alphabet

Sometimes while working with the alphabet in python, to make our task easy, we want to initialize a list containing all the alphabets. If we do not know how to do it using python, we will manually type all the alphabets, which will be quite a time taking. In this article, we will learn many different ways of initializing a list containing the alphabets in uppercase, lowercase, in both uppercase and lowercase. We will also learn how to do various operations on alphabets. 

In every programming language, including python, every alphabet has a unique ASCII value. We can convert those ASCII values into alphabets using chr and ord functions.  

Generating a list of Alphabets in Python 

There are many ways to initialize a list containing alphabets, and we will start with the naïve way. 

Naïve Approach 

The ASCII value of A-Z lies in the range of 65-90, and the for a-z, the value is in the range 97 – 122. What we will do is that we will run the loop in this range and using chr(), we will convert these ASCII values into alphabets. 

A-Z: 

# initialize an empty list that will contain all the capital 
# alphabets
alphabets_in_capital=[]
for i in range(65,91):
    alphabets_in_capital.append(chr(i))
print(alphabets_in_capital)
['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
python alphabet

a-z:  

# initialize an empty list that will contain all the lowercase alphabets
alphabets_in_lowercase=[]
for i in range(97,123):
    alphabets_in_lowercase.append(chr(i))
print(alphabets_in_lowercase)
['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']

Python Alphabet using list comprehension 

We can initialize the variable with either ‘a’ or ‘A’ and keep incrementing the ASCII value of the variable. We will run the loop 26 times as there are 26 alphabets in the English language.  

var='a'
alphabets=[]
# starting from the ASCII value of 'a' and keep increasing the 
# value by i.
alphabets=[(chr(ord(var)+i)) for i in range(26)]
print(alphabets)
['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
var='A'
alphabets=[]
alphabets=[(chr(ord(var)+i)) for i in range(26)]
print(alphabets)
['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']

Python Alphabet using map function 

We can also use the map function to produce the list of alphabets, let’s see how. 

# make a list of numbers from 97-123 and then map(convert) it into # characters. 
alphabet = list(map(chr, range(97, 123)))
print(alphabet)
['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
alphabets = list(map(chr, range(ord('A'), ord('Z')+1)))
print(alphabets)

Importing the String Module

We can also import the string module, and use its functions to make a list of alphabets without any hassle.

import string
lowercase_alphabets=list(string.ascii_lowercase)
print(lowercase_alphabets)
uppercase_alphabets=list(string.ascii_uppercase)
print(uppercase_alphabets)
alphabets=list(string.ascii_letters)
print(alphabets)
['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']

['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']

['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']

How to check if the character is Alphabet or not in Python

If we want to check if the character is an alphabet or not, we can use the if condition or the built-in function. Let’s see how.

Using If Condition

variable='A'
if (variable>='a' and variable<='z') or (variable>='A' and variable<='Z'):
    print("isalphabet")
else:
    print("not a alphabet")
isalphabet

Using built-in function

We can also use the isalpha() method to check whether the character is an alphabet or not.

variable='g'
print(variable.isalpha())
print('1'.isalpha())
True 
False

How to Convert alphabet into ASCII value

Let us see how we can convert alphabets into their respective ASCII values.

var='G'
# using ord() function
print(ord(var))
71

Conclusion

Generally in dynamic programming or while making any application, we need to initialize a Python list containing the alphabets. There are a variety of ways using we can make a list containing all the alphabets like using the string module or by using the ASCII values.

Try to run the programs on your side and let us know if you have any queries.

Happy Coding!

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