A simple function that uses TradingView's API to get all the stock symbols in the US stock market, and you can filter them by exchange.

get_all_symbols.py

from __future__ import annotations

import requests


def get_all_symbols(exchanges: set[str]) -> list[str]:
    """
    Get a list with all the symbols filtered by a given exchange.
    
    Valid exchanges: {'AMEX', 'OTC', 'NYSE', 'NASDAQ'}
    
    :param exchanges: a set which contains the exchanges you want to keep (all the rest will be ignored)
    :return: list of symbols
    """
    exchanges = {x.upper() for x in exchanges}
    r = requests.get('https://scanner.tradingview.com/america/scan')
    data = r.json()['data']  # [{'s': 'NYSE:HKD', 'd': []}, {'s': 'NASDAQ:ALTY', 'd': []}...]
    
    symbols = []
    for dct in data:
        exchange, symbol = dct['s'].split(':')
        if exchange in exchanges:
            symbols.append(symbol)
    return symbols
    
    
# examples:
symbols = get_all_symbols(exchanges={'AMEX', 'OTC', 'NYSE', 'NASDAQ'})
print(len(symbols), symbols[:10])  # out: 18528 ['EFHT', 'SWSDF', 'CHKR', 'MGUY', 'VHC', 'PWCDF', 'LUGDF', 'ABEQ', 'LL', 'HCBN']

symbols = get_all_symbols(exchanges={'NYSE', 'NASDAQ'})
print(len(symbols), symbols[:10])  # out: 7768 ['VNT', 'LXP/PC', 'USB/PR', 'NOVVU', 'RITM', 'PSTG', 'SMSI', 'MAQC', 'NX', 'TNC']

symbols = get_all_symbols(exchanges={'AMEX', 'NYSE', 'NASDAQ'})
print(len(symbols), symbols[:10])  # out: 10648 ['SDHY', 'CNK', 'WWW', 'HOLX', 'IBTD', 'JZRO', 'FUNC', 'SECO', 'PXSAP', 'PCT']

symbols = get_all_symbols(exchanges={'NASDAQ'})
print(len(symbols), symbols[:10])  # out: 4633 ['IGMS', 'HAIAU', 'VMGA', 'TRMK', 'LGIH', 'VCIT', 'PAA', 'INTU', 'MOBQ', 'RAYA']

symbols = get_all_symbols(exchanges={'NYSE'})
print(len(symbols), symbols[:10])  # out: 3135 ['HL', 'OTIS', 'BHR/PB', 'NGG', 'COHR', 'SOS', 'SKT', 'STET.U', 'NVST', 'EVRI']