What are some examples of pass by reference in Python?
In Python, all arguments are passed by object reference. This means that if you pass a mutable object, changes to it will affect the original object. For example, if you pass a list to a function and modify it, the original list will reflect those changes.
Can you show me a code example?
Sure! Here's a simple example:
def modify_list(my_list):
my_list.append(4)
original_list = [1, 2, 3]
modify_list(original_list)
print(original_list) # Output: [1, 2, 3, 4]
In this case, original_list
is modified because lists are mutable.
What about immutable objects like strings?
Good question! Strings are immutable in Python. If you try to modify a string, a new string is created instead. For example:
def modify_string(my_string):
my_string += ' world'
return my_string
original_string = 'Hello'
new_string = modify_string(original_string)
print(original_string) # Output: Hello
print(new_string) # Output: Hello world
Here, original_string
remains unchanged.
Are there any other mutable types I should know about?
Yes! Besides lists, other mutable types include dictionaries and sets. They can also be modified in place, affecting the original object.
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