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Python: Convert a list of dictionaries into a list of values corresponding to the specified key

Python dictionary: Exercise-73 with Solution

Write a Python program to convert a list of dictionaries into a list of values corresponding to the specified key.

  • Use a list comprehension and dict.get() to get the value of key for each dictionary in lst.

Sample Solution:

Python Code:

def test(lsts, key):
  return [x.get(key) for x in lsts]
 
students = [
  { 'name': 'Theodore', 'age': 18 },
  { 'name': 'Mathew', 'age': 22 },
  { 'name': 'Roxanne', 'age': 20 },
  { 'name': 'David', 'age': 18 }
]

print("Original list of dictionaries:")
print(students)
print("\nConvert a list of dictionaries into a list of values corresponding to the specified key:")
print(test(students, 'age'))

Sample Output:

Original list of dictionaries:
[{'name': 'Theodore', 'age': 18}, {'name': 'Mathew', 'age': 22}, {'name': 'Roxanne', 'age': 20}, {'name': 'David', 'age': 18}]

Convert a list of dictionaries into a list of values corresponding to the specified key:
[18, 22, 20, 18]

Flowchart:

Flowchart: Convert a list of dictionaries into a list of values corresponding to the specified key.

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Previous: Write a Python program to invert a dictionary with unique hashable values.
Next: Write a Python program to create a dictionary with the same keys as the given dictionary and values generated by running the given function for each value.

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Python: Tips of the Day

Decapitalizes the first letter of a string:

Example:

def tips_decapitalize(s, upper_rest=False):
  return s[:1].lower() + (s[1:].upper() if upper_rest else s[1:])
print(tips_decapitalize('PythonTips'))
print(tips_decapitalize('PythonTips', True)) 

Output:

pythonTips
pYTHONTIPS