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Python: Convert a given string into a list of words

Python String: Exercise-46 with Solution

Write a Python program to convert a given string into a list of words.

Python String Exercises: Convert a given string into a list of words.

Sample Solution-1:

Python Code:

str1 = "The quick brown fox jumps over the lazy dog."
print(str1.split(' '))
str1 = "The-quick-brown-fox-jumps-over-the-lazy-dog."
print(str1.split('-'))

Sample Output:

['The', 'quick', 'brown', 'fox', 'jumps', 'over', 'the', 'lazy', 'dog.']                                      
['The', 'quick', 'brown', 'fox', 'jumps', 'over', 'the', 'lazy', 'dog.']                     

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Sample Solution-2:

  • Use re.findall() with the supplied pattern to find all matching substrings.
  • Omit the second argument to use the default regexp, which matches alphanumeric and hyphens.

Python Code:

import re
def string_to_list(s, pattern = '[a-zA-Z-]+'):
  return re.findall(pattern, s)
print(string_to_list('The quick brown fox jumps over the lazy dog.'))
print(string_to_list('Python, JavaScript & C++'))
print(string_to_list('build -q --out one-item', r'\b[a-zA-Z-]+\b'))

Sample Output:

['The', 'quick', 'brown', 'fox', 'jumps', 'over', 'the', 'lazy', 'dog']
['Python', 'JavaScript', 'C']
['build', 'q', 'out', 'one-item']                     

Flowchart:

Flowchart: Convert a string in a list

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Python Code Editor:

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Previous: Write a Python program to check if a string contains all letters of the alphabet.
Next: Write a Python program to lowercase first n characters in a string.

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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