<|im_start|>system
You are a helpful AI assistant.<|im_end|>
<|im_start|>user
In what version of python did dictionaries become ordered by default?<|im_end|>
<|im_start|>assistant
Python 3.7 introduced ordered dictionaries.
In previous versions of Python, dictionaries were unordered - the order of items was essentially random and not guaranteed.
From Python 3.7 onwards, dictionaries preserve insertion order by default - so the order you add keys/values to the dict will be retained when iterating etc.
This was done to aid predictability and avoid some performance pitfalls with assuming ordering and then having the dictionary reorganize its contents. The unordered nature of earlier Python dicts was partly for efficiency reasons.<|im_end|>
<|im_start|>user
Can you give me an example code to show how dictionaries work?<|im_end|>
<|im_start|>assistant
Sure! Here's a basic example of how dictionaries work in Python:

# Creating a dictionary
my_dict = {"name": "John Doe", "age": 32, "city": "New York"}

# Accessing values in a dictionary
print(my_dict["name"]) # Output: "John Doe"
print(my_dict["age"]) # Output: 32

# Modifying values in a dictionary
my_dict["age"] = 33
print(my_dict["age"]) # Output: 33

# Adding a new key-value pair to the dictionary
my_dict["gender"] = "Male"
print(my_dict) # Output: {'name': 'John Doe', 'age': 33, 'city': 'New York', 'gender': 'Male'}

# Removing a key-value pair from the dictionary
del my_dict["city"]
print(my_dict) # Output: {'name': 'John Doe', 'age': 33, 'gender': 'Male'}

# Checking if a key exists in a dictionary
print("name" in my_dict) # Output: True
print("city" in my_dict) # Output: False<|im_end|>