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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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Python: Tips of the Day

Check if a given key already exists in a dictionary:

In is the intended way to test for the existence of a key in a dict.

d = {"key1": 10, "key2": 23}

if "key1" in d:
    print("this will execute")

if "nonexistent key" in d:
    print("this will not")

If you wanted a default, you can always use dict.get():

d = dict()

for i in range(100):
    key = i % 10
    d[key] = d.get(key, 0) + 1

and if you wanted to always ensure a default value for any key you can either use dict.setdefault() repeatedly or defaultdict from the collections module, like so:

from collections import defaultdict

d = defaultdict(int)

for i in range(100):
    d[i % 10] += 1

but in general, the in keyword is the best way to do it.

Ref: https://bit.ly/2XPMRyz