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### O que é um Programa

A palavra **programa** é comumente usada para descrever muitas coisas:

* O **código** que você escreve, os **arquivos Python**.
* O **arquivo** que pode ser **executado** pelo sistema operacional, por exemplo: `python`, `python.exe` ou `uvicorn`.
* Um programa específico enquanto está **em execução** no sistema operacional, usando a CPU e armazenando coisas na memória. Isso também é chamado de **processo**.

### O que é um Processo

Se você se sente perdido com todo esse assunto de **"expressão regular"**, não se preocupe. Esse é um assunto complicado para a maioria das pessoas. Você ainda pode fazer muitas coisas sem utilizar expressões regulares.

Mas assim que você precisar e já tiver aprendido sobre, saiba que você poderá usá-las diretamente no **FastAPI**.

## Valores padrão

```Python
burgers = await get_burgers(2)
```

A chave aqui é o `await`. Ele diz ao Python que ele tem que esperar por `get_burgers(2)` finalizar suas coisas 🕙 antes de armazenar os resultados em `burgers`. Com isso, o Python saberá que ele pode ir e fazer outras coisas 🔀 ⏯ nesse meio tempo (como receber outra requisição).