Python Click CLI: Validate and Modify Arguments

Jul 29, 2019

Click arguments validation and modify arguments.

  • Symbol must be BTCUSDT, ETHUSDT, BTCETH as per this rule.
  • Split symbol from BTCUSDT into BTC and USDT.
import clickimport redef validate_symbol(ctx, param, value):    m ='^(\w+)(BTC|ETH|BNB|USDT|PAX|TUSD|USDC)$', value)    if m:        c1_symbol =        c2_symbol =        return (c1_symbol, c2_symbol)    else:        raise click.BadParameter('Invalid symbol')@cli.command()@click.option('--symbol', callback=validate_symbol, required=True)def get_price(symbol):    c1_symbol, c2_symbol = symbol    symbol = ''.join(symbol)

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