chore: Add Python Client examples [docs] (#191)

Part of apify/apify-web/issues/3616

Added multiple examples, consulted with @vdusek. 

First three are the same as [JavaScript
ones](apify/apify-client-js#548), just
reimplemented to Python. Last one is using Python-specific Pandas
library for data analysis.

Author: HonzaTuron

docs/examples.md

@@ -0,0 +1,140 @@
+---
+sidebar_label: Examples
+title: 'Code examples'
+---
+
+## Passing an input to the Actor
+
+The fastest way to get results from an Actor is to pass input directly to the `call` function.
+We can set up the input, pass it to `call` function and get the reference of running Actor (or wait for finish).
+
+```python
+from apify_client import ApifyClient
+
+# Client initialization with the API token
+apify_client = ApifyClient(token='MY_APIFY_TOKEN')
+
+actor_client = apify_client.actor('apify/instagram-hashtag-scraper')
+
+input_data = { 'hashtags': ['rainbow'], 'resultsLimit': 20 }
+
+# Run the Actor and wait for it to finish up to 60 seconds.
+# Input is not persisted for next runs.
+run_data = actor_client.call(run_input=input_data, timeout_secs=60)
+```
+
+## Manipulating with tasks
+
+To run multiple inputs with the same Actor, most convenient way is to create multiple [tasks](https://docs.apify.com/platform/actors/running/tasks) with different inputs.
+Task input is persisted on Apify platform when task is created.
+
+```python
+
+import asyncio
+
+from apify_client import ApifyClientAsync
+from apify_client.clients.resource_clients import TaskClientAsync
+
+animal_hashtags = ['zebra', 'lion', 'hippo']
+
+
+async def run_apify_task(client: TaskClientAsync) -> dict:
+    result = await client.call()
+    return result or {}
+
+
+async def main() -> None:
+    apify_client = ApifyClientAsync(token='MY_APIFY_TOKEN')
+
+    # Create Apify tasks
+
+    apify_tasks: list[dict] = []
+    apify_tasks_client = apify_client.tasks()
+
+    for hashtag in animal_hashtags:
+        apify_task = await apify_tasks_client.create(
+            name=f'hashtags-{hashtag}',
+            actor_id='apify/instagram-hashtag-scraper',
+            task_input={'hashtags': [hashtag], 'resultsLimit': 20},
+            memory_mbytes=1024,
+        )
+        apify_tasks.append(apify_task)
+
+    print('Tasks created:', apify_tasks)
+
+    # Create Apify task clients
+
+    apify_task_clients: list[TaskClientAsync] = []
+
+    for apify_task in apify_tasks:
+        task_id = apify_task['id']
+        apify_task_client = apify_client.task(task_id)
+        apify_task_clients.append(apify_task_client)
+
+    print('Task clients created:', apify_task_clients)
+
+    # Execute Apify tasks
+
+    run_apify_tasks = [run_apify_task(client) for client in apify_task_clients]
+    task_run_results = await asyncio.gather(*run_apify_tasks)
+
+    print('Task results:', task_run_results)
+
+
+if __name__ == '__main__':
+    asyncio.run(main())
+```
+
+## Getting latest data from an Actor, joining datasets
+
+Actor data are stored to [datasets](https://docs.apify.com/platform/storage/dataset). Datasets can be retrieved from Actor runs.
+Dataset items can be listed with pagination.
+Also, datasets can be merged together to make analysis further on with single file as dataset can be exported to various data format (CSV, JSON, XSLX, XML).
+[Integrations](https://docs.apify.com/platform/integrations) can do the trick as well.
+
+```python
+from apify_client import ApifyClient
+
+# Client initialization with the API token
+apify_client = ApifyClient(token='MY_APIFY_TOKEN')
+
+actor_client = apify_client.actor('apify/instagram-hashtag-scraper')
+
+actor_runs = actor_client.runs()
+
+# See pagination to understand how to get more datasets
+actor_datasets = actor_runs.list(limit=20)
+
+merging_dataset = apify_client.datasets().get_or_create(name='merge-dataset')
+
+for dataset_item in actor_datasets.items:
+    # Dataset items can be handled here. Dataset items can be paginated
+    dataset_items = apify_client.dataset(dataset_id=dataset_item['id']).list_items(limit=1000)
+
+    # Items can be pushed to single dataset
+    apify_client.dataset(merging_dataset['id']).push_items(dataset_items.items)
+
+    # ...
+```
+
+## Integration with data analysis libraries (Pandas)
+
+The Apify API client for Python can be easily integrated with data analysis libraries.
+Following example demonstrates how to load items from the last dataset run and pass them to a Pandas DataFrame for further analysis.
+Pandas is a data analysis library that provides data structures and functions to efficiently manipulate large datasets.
+
+```python
+from apify_client import ApifyClient
+import pandas
+
+# Initialize the Apify client
+client = ApifyClient(token="MY_APIFY_TOKEN")
+
+# Load items from last dataset run
+dataset_data = client.actor('apify/web-scraper').last_run().dataset().list_items()
+
+# Pass dataset items to Pandas DataFrame
+data_frame = pandas.DataFrame(dataset_data.items)
+
+print(data_frame.info)
+```

website/sidebars.js

@@ -12,6 +12,10 @@ module.exports = {
             type: 'doc',
             id: 'usage-concepts',
         },
+        {
+            type: 'doc',
+            id: 'examples',
+        },
         {
             type: 'doc',
             id: 'changelog',