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# Dictionaries

## Dictionaries in Python

```python
# Define dict:
dict = {
	'k1': 'some data',
	7: ['can', 'be', 'a', 'list']
}

# Dictionaries are not position oriented, they are key oriented
# To get the data:
dict['k1'] # prints 'some data'

print(dict[7]) # prints ['can', 'be', 'a', 'list']
```

**Dictionaries are mutable and can be changed**

```python
dict[7] = 'new value'
```

**You cannot sort dictionaries, you should use keys to get the data**

```python
people_weight_dict = {
	'john': 123,
	'mike': 170,
	'robert': 167
}

# To change john's weight you would do
people_weight_dict['john'] = 134
```

**You can pop items from dictionaries**

```python
people_weight_dict.pop('mike')
```

**Syntax:**

```python
dict.pop('key')
```

#### Clear method

```python
people_weight_dict.clear()
# It will still be a dictionary but it will be an empty one
```

### Adding items to dictionary:

```python
people_weight_dict = {
	'john': 123,
	'mike': 170,
	'robert': 167
}
# Adding the data
people_weight_dict['new_key'] = 'new data to be added'

# At this point the dict has been permanently modified and adjusted with a new entry
```

**Accessing item from a list in the dict**

```python
people_weight_dict = {
	'john': 123,
	'mike': 170,
	'robert': 167,
	'items': ['apple', 'banana', 'orange']
}

print(people_weight_dict['items'][2]) # prints orange
```

**Accessing items from a dictionary in a list in a dict**

```python
people_weight_dict = {
	'john': 123,
	'mike': 170,
	'robert': 167,
	'items': ['apple', 'banana', {'k1': 'some value'}]
}
print(people_weight_dict['items'][2]['k1']) # prints 'some value'
```

**Remove items for dictionary:**

```python
people_weight_dict = {
	'john': 123,
	'mike': 170,
	'robert': 167,
	'items': ['apple', 'banana', {'k1': 'some value'}]
}

people_weight_dict.pop['items']
print(people_weight_dict) 
# It will print:
people_weight_dict = {
	'john': 123,
	'mike': 170,
	'robert': 167
}
```


---

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