Python – Convert Dictionary values to Absolute Magnitude

Given a dictionary, convert its values to absolute.

Input : test_dict = {“Gfg” : -5, “is” : -7, “Best” : -2} 
Output : {“Gfg” : 5, “is” : 7, “Best” : 2} 
Explanation : All negative elements changed to positive with same magnitude

Input : test_dict = {“Gfg” : -8, “is” : 7, “Best” : -2} 
Output : {“Gfg” : 8, “is” : 7, “Best” : 2} 
Explanation : All negative elements changed to positive with same magnitude 

Method #1 : Using loop + abs()

This is one of the ways in which this task can be performed. In this, we iterate for each value of dictionary using loop and perform the absolute magnitude conversion using abs().

The original dictionary is : {'Gfg': 5, 'is': -7, 'Best': 2, 'for': -9, 'Lazyroar': -8}
Dictionary after absolute conversion : {'Gfg': 5, 'is': 7, 'Best': 2, 'for': 9, 'Lazyroar': 8}

Time Complexity: O(n), where n is the values in dictionary
Auxiliary Space: O(n), where n is the size of dictionary

Method #2 : Using dictionary comprehension + abs()

This task is similar to above method. The difference being dictionary comprehension is used instead of loop to perform the task of iteration through keys.

The original dictionary is : {'Gfg': 5, 'is': -7, 'Best': 2, 'for': -9, 'Lazyroar': -8}
Dictionary after absolute conversion : {'Gfg': 5, 'is': 7, 'Best': 2, 'for': 9, 'Lazyroar': 8}

Method #3 : Without using abs()

The original dictionary is : {'Gfg': 5, 'is': -7, 'Best': 2, 'for': -9, 'Lazyroar': -8}
Dictionary after absolute conversion : {'Gfg': 5, 'is': 7, 'Best': 2, 'for': 9, 'Lazyroar': 8}

Method 4: using map() and abs() functions:

The original dictionary is : {'Gfg': 5, 'is': -7, 'Best': 2, 'for': -9, 'Lazyroar': -8}
Dictionary after absolute conversion : {'Gfg': 5, 'is': 7, 'Best': 2, 'for': 9, 'Lazyroar': 8}

Time complexity: O(n), where n is the number of elements in the dictionary. 
Auxiliary space: O(n), because we are creating a new dictionary to store the results of the absolute value conversion.

Method #5 : Using operator.abs() method

Approach

This is one of the ways in which this task can be performed. 

• In this, we iterate for each value of dictionary using loop
• perform the absolute magnitude conversion using operator.abs()

The original dictionary is : {'Gfg': 5, 'is': -7, 'Best': 2, 'for': -9, 'Lazyroar': -8}
Dictionary after absolute conversion : {'Gfg': 5, 'is': 7, 'Best': 2, 'for': 9, 'Lazyroar': 8}

Time complexity: O(n), where n is the number of elements in the dictionary. 
Auxiliary space: O(n), because we are creating a new dictionary to store the results of the absolute value conversion.

Method 6: Using numpy library

• Convert the dictionary values to absolute magnitude using the numpy abs() function and a dictionary comprehension
• Assign the resulting dictionary to the test_dict variable using test_dict = {key: np.abs(value) for key, value in test_dict.items()}.
• Print the resulting dictionary using print(“Dictionary after absolute conversion : ” + str(test_dict)).

Output:

The original dictionary is : {'Gfg': 5, 'is': -7, 'Best': 2, 'for': -9, 'Lazyroar': -8}
Dictionary after absolute conversion : {'Gfg': 5, 'is': 7, 'Best': 2, 'for': 9, 'Lazyroar': 8}

Time complexity: O(n) 
Auxiliary space: O(n), where n is the number of items in the dictionary.

Method 7 : Using pandas library

• Importing the pandas module using the “import” statement and giving it an alias “pd”.
• Initializing a Python dictionary “test_dict” with keys and values.
• Printing the original dictionary using the “print()” function.
• Creating a pandas DataFrame “df” from the dictionary “test_dict” using the “pd.DataFrame.from_dict()” method, specifying the orientation of the
• dictionary as ‘index’, and providing the column name as ‘values’.
• Applying the “abs()” function on the ‘values’ column of the pandas DataFrame to calculate absolute values.
• Converting the pandas DataFrame back to a Python dictionary “abs_dict” using the “to_dict()” method.
• Printing the final dictionary after absolute conversion using the “print()” function.

OUTPUT :
The original dictionary is : {'Gfg': 5, 'is': -7, 'Best': 2, 'for': -9, 'Lazyroar': -8}
Dictionary after absolute conversion : {'Gfg': 5, 'is': 7, 'Best': 2, 'for': 9, 'Lazyroar': 8}

Time complexity: O(n)
Auxiliary space: O(n)