Installing FastAPI

Let’s begin our journey of API development with FastAPI. Before we begin let’s verify that we have Python already install in our system and PIP (Python Package Manager). It is suggest to use Visual Code for writing code, click here to see various open source code editors and how to install them.

Installation through PIP

• Navigate to project folder, for example at Desktop, make new folder fast-api-server-demo.
• Initialize new virtual environment using python -m virtualenv py3-fastapi
• If you don’t have virtual environment already installed, install it using pip install vitrualenv.
• Activate using following commands (open command prompt at project folder)
  • If you are on Linux & MacOS use: source py3-fastapi/bin/activate
  • And, if you are Windows use: py3-fastapi/Scripts/activate
  • Once activated, we must see py3-fastapi context in our terminal.

def get_csv_file_dialect_columns(file: str, encoding: str):
    """Get csv dialect and number of columns of the csv."""
    file_ctx = get_csv_file_context(file=file, encoding=encoding)
    with file_ctx as fp:
        try:
            dialect = csv.Sniffer().sniff(fp.read(1024))
            fp.seek(0)
        except Exception:
            dialect = 'excel'  #: can not sniff delimiter, use default dialect
        try:
            reader = csv.reader(fp, dialect=dialect)
            num_columns = len(next(reader))
        except StopIteration:
            raise IOError('CSV file not exist or is empty')
        fp.seek(0)
        return dialect, num_columns

Next steps

• Now we will make main.py and write our first HTTP server using FastAPI.