Python: Create a shallow copy of a given dictionary
Python module: Exercise-3 with Solution
Write a Python program to create a shallow copy of a given dictionary. Use copy.copy
Sample Solution:
Python Code:
import copy
nums_x = {"a":1, "b":2, 'cc':{"c":3}}
print("Original dictionary: ", nums_x)
nums_y = copy.copy(nums_x)
print("\nCopy of the said list:")
print(nums_y)
print("\nChange the value of an element of the original dictionary:")
nums_x["cc"]["c"] = 10
print(nums_x)
print("\nSecond dictionary:")
print(nums_y)
nums = {"x":1, "y":2, 'zz':{"z":3}}
nums_copy = copy.copy(nums)
print("\nOriginal dictionary :")
print(nums)
print("\nCopy of the said list:")
print(nums_copy)
print("\nChange the value of an element of the original dictionary:")
nums["zz"]["z"] = 10
print("\nFirst dictionary:")
print(nums)
print("\nSecond dictionary (copy):")
print(nums_copy)
Sample Output:
Original dictionary: {'a': 1, 'b': 2, 'cc': {'c': 3}} Copy of the said list: {'a': 1, 'b': 2, 'cc': {'c': 3}} Change the value of an element of the original dictionary: {'a': 1, 'b': 2, 'cc': {'c': 10}} Second dictionary: {'a': 1, 'b': 2, 'cc': {'c': 10}} Original dictionary : {'x': 1, 'y': 2, 'zz': {'z': 3}} Copy of the said list: {'x': 1, 'y': 2, 'zz': {'z': 3}} Change the value of an element of the original dictionary: First dictionary: {'x': 1, 'y': 2, 'zz': {'z': 10}} Second dictionary (copy): {'x': 1, 'y': 2, 'zz': {'z': 10}}
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Previous: Write a Python program to create a deep copy of a given list.
Next: Write a Python program to create a deep copy of a given dictionary.
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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
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