How to check if a ticker is yfinance library

I'm trying to find some information on some tickers through yfinance. However, I run into an error whenever I try to search up information on a ticker that doesn't exist. For example, this is the code I had.

import yfinance as yf

with open("/2019.txt") as f:
    content = f.readlines()
# content is a list with all tickers in "/2019.txt"
content = [x.strip() for x in content] 

print(content)

for x in content:
    y = yf.Ticker(x)
    z = y.info['volume']
    print(x)
    print(z)

This is the error I received:

/usr/local/lib/python3.6/dist-packages/yfinance/base.py in _get_fundamentals(self, kind, proxy)
        338                 self._info.update(data[item])
        339 
    --> 340         self._info['regularMarketPrice'] = self._info['regularMarketOpen']
        341         self._info['logo_url'] = ""
        342         try:
    
    KeyError: 'regularMarketOpen'

To fix this I tried:

import yfinance as yf

with open("/2019.txt") as f:
    content = f.readlines()
# content is a list with all tickers in "/2019.txt"
content = [x.strip() for x in content] 

print(content)

for x in content:
    y = yf.Ticker(x)
    if(y==1):
      z = y.info['volume']
      print(x)
      print(z)
    elif(y==0):
      print(y)
      print( "does not exist")

But now it doesn't print anything except the tickers in the list.

Does anyone know how to approach this? Thanks!

Try to get the info of the ticker and if you get an exception you probably cannot do much more with it:

import yfinance as yf

for t in ["MSFT", "FAKE"]:
  ticker = yf.Ticker(t)
  info = None

  try:
    info = ticker.info
  except:
    print(f"Cannot get info of {t}, it probably does not exist")
    continue
  
  # Got the info of the ticker, do more stuff with it
  print(f"Info of {t}: {info}")

See a demo on this colab.