# Python CSV Module

The `csv` module implements classes to read and write tabular data in CSV format.

## Importing the Module

```python
import csv
```

## Reading CSV Files

### `csv.reader`

To read a CSV file, you can use the `csv.reader` object.

```python
import csv

with open('data.csv', 'r') as file:
    reader = csv.reader(file)
    for row in reader:
        print(row)
```

### `csv.DictReader`

The `csv.DictReader` class operates like a regular reader but maps the information in each row to a dictionary whose keys are given by the optional `fieldnames` parameter.

```python
import csv

with open('data.csv', 'r') as file:
    reader = csv.DictReader(file)
    for row in reader:
        print(row['column_name'])
```

## Writing CSV Files

### `csv.writer`

To write to a CSV file, use the `csv.writer` object.

```python
import csv

with open('data.csv', 'w', newline='') as file:
    writer = csv.writer(file)
    writer.writerow(["Name", "Age", "City"])
    writer.writerow(["John", "30", "New York"])
```

### `csv.DictWriter`

The `csv.DictWriter` class operates like a regular writer but maps dictionaries onto output rows.

```python
import csv

with open('data.csv', 'w', newline='') as file:
    fieldnames = ['name', 'age']
    writer = csv.DictWriter(file, fieldnames=fieldnames)

    writer.writeheader()
    writer.writerow({'name': 'John', 'age': 30})
    writer.writerow({'name': 'Jane', 'age': 25})
```

[[programming/python/python]]