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Python: Create a shallow copy of a given list

Python module: Exercise-1 with Solution

Write a Python program to create a shallow copy of a given list. Use copy.copy

Sample Solution:

Python Code:

import copy
nums_x = [1, [2, 3, 4]]
print("Original list: ", 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 list:")
nums_x[1][1] = 10
print(nums_x)
print("\nSecond list:")
print(nums_y)
nums =  [[1], [2]]
nums_copy = copy.copy(nums)
print("\nOriginal list:")
print(nums)
print("\nCopy of the said list:")
print(nums_copy)
print("\nChange the value of an element of the original list:")
nums[0][0] = 0
print("\nFirst list:")
print(nums)
print("\nSecond list:")
print(nums_copy)

Sample Output:

Original list:  [1, [2, 3, 4]]

Copy of the said list:
[1, [2, 3, 4]]

Change the value of an element of the original list:
[1, [2, 10, 4]]

Second list:
[1, [2, 10, 4]]

Original list:
[[1], [2]]

Copy of the said list:
[[1], [2]]

Change the value of an element of the original list:

First list:
[[0], [2]]

Second list:
[[0], [2]]

Flowchart:

Flowchart: Create a shallow copy of a given 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

For-else construct useful when searched for something and find it:

# For example assume that I need to search through a list and process each item until a flag item is found and 
# then stop processing. If the flag item is missing then an exception needs to be raised.

for i in mylist:
    if i == theflag:
        break
    process(i)
else:
    raise ValueError("List argument missing terminal flag.")