Some Basic Python Dictionary Programs-1


Dictionary is an unordered collection of mutable values indexed by unique keys. Values in a dictionary can be of any datatype, mutable and can be duplicated, whereas keys can’t be repeated and are immutable.

Python program to extract values of Particular Key in Nested Values

  • List comprehension is a compact method that defines a list and its contents at the same time. Its basic syntax consists of a square bracket with an expression that is executed for each element along with for loop to iterate over each element. Read more: List Comprehension in Python – Explained with Examples
  • The keys() built-in dictionary method returns a list of all the keys in the dictionary.
  • The values() built-in dictionary method returns a list of all the values in the dictionary.
  • The items() built-in dictionary method returns a list of the tuple pairs of all the keys with the values in the dictionary.

Python program to convert the tuple value list to the list of the tuples

  • The ‘*’ operator unpacks every element of an iterable to other variables dynamically.

Python program to cross-map two dictionaries

  • Dictionary comprehension is similar to set comprehension with an additional requirement of defining a key. In the comprehension expression key and values are separated by a colon ‘:’.

Python program to column mapped the tuples to the dictionary items

  • The zip() built-in method returns an iterator of tuples, grouping the similar index of multiple sequences so that they can be used as a single entity.

Python program to pair the minimum value for the similar dictionary keys

  • The lambda function is a function that is defined without a name. It can have any number of arguments but only one expression as it is a small function having a single line of code. The expression is evaluated and returned.
  • The sorted() built-in method takes an iterable and returns a sorted list containing the elements from the iterable, without modifying the original iterable. The key parameter defines the base criteria for sort. Read More: Sorting in python
  • The dict() built-in method takes iterables and creates a new dictionary from its elements.

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