Human: Write me a Python function to merge objects without overwriting them. Assistant: 
Here is a Python function to merge objects without overwriting them

import copy

def merge_without_overwrite(target, source):
    """
    Merge objects without overwrite.

    :param target: The target object
    :param source: The source object
    """
    for key in list(source.keys()):
        if key in target:
            if target[key]!= source[key]:
                target[key] = source[key]
        else:
            target[key] = source[key]

# Enter the target
target = {"a": 1, "b": 2}

# Enter the source
source = {"a": 3, "b": 4}

# Calling the function
print((merge_without_overwrite(target, source)))

#Example Output
# None

#Remember to inspect code for bugs.