A dictionary contains key-value pairs. To create a dictionary, use a pair of curly brackets. To create an empty dictionary, leave the brackets empty. To create a dictionary with data, put key-value pairs inside of the brackets. Examples:

empty_dict = {}
student = {"name": "Tom", "age": 17, "height": 68}

To get a value from the dictionary above, use square brackets with the corresponding key:

print(student["age"])
# 17

To add a key-value pair to the dictionary, or to update a value in the dictionary, use the = operator:

# adds new key-value pair
student["year"] = 11
print(student["year"])
# 11

# updates existing key-value pair
student["age"] = 18
print(student["age"])
# 18

To check if a particular key is in the dictionary, use the in keyword:

print("name" in student) # True
print("grade" in student) # False

To remove a key-value pair from the dictionary, use the del keyword with the key:

del student["height"]
print(student["height"])

# Traceback (most recent call last):
#   File "main.py", line 3, in <module>
#     print(student["height"])
# KeyError: 'height'