Python File I/O: List English alphabet in a file by specified number of letters on each line

Last update on May 28 2022 13:43:16 (UTC/GMT +8 hours)

Python File I/O: Exercise-21 with Solution

Write a Python program to create a file where all letters of English alphabet are listed by specified number of letters on each line.

Sample Solution:

Python Code:

import string
def letters_file_line(n):
   with open("words1.txt", "w") as f:
       alphabet = string.ascii_uppercase
       letters = [alphabet[i:i + n] + "\n" for i in range(0, len(alphabet), n)]
       f.writelines(letters)
letters_file_line(3)

Output:

words1.txt
ABC
DEF
GHI
JKL
MNO
PQR
STU
VWX
YZ

Flowchart:

Python Code Editor:

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

The os and os.path modules.
The __file__ constant
os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
os.path.dirname(path) (returns "the directory name of pathname path")
os.getcwd() (returns "a string representing the current working directory")
os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m