Python Dictionary construction using a mapping object

Overview of dict(mapping):

Dictionaries can be created using an existing mapping object.
A mapping object is an object that implements the interface as defined by the collections.abc.mapping class.
The class dict which implements the dictionary behaviour in Python is derived from the collections.abc.mapping class.
In other words, a dictionary can be created from another dictionary. As of now Python has only one mapping type and it is the dict type.

Example:

# Example Python program that creates
# a dictionary instance from an existing mapping
# instance

# A dictionary of pids vs their bytes in physical memory
pidVsMem = {141:14812,
131:29613,
129:48349};

# Create a dictionary from an existing dictionary
snapshot = dict(pidVsMem);
print("Snapshot:");
print(snapshot);

# Remove the key-value for the smallest key
snapshotKeys = snapshot.keys();
snapshot.pop(min(snapshotKeys));
print("Snapshot-updated:");
print(snapshot);

Output:

Snapshot:
{141: 14812, 131: 29613, 129: 48349}
Snapshot-updated:
{141: 14812, 131: 29613}