How to ignore "KeyError" in Python

Question

I am trying to analyze stocks within python using the api "yfinance." I get the program to run just fine most of the time. However, when it is unable to 'find' one of the fields, it throughs up an error (KeyError). Here is a snippet of my code.

import yfinance as yf
stock = yf.Ticker(stock)
pegRatio = stock.info['pegRatio']
print(pegRatio)
if pegRatio > 1:
    print("The PEG Ratio for "+name+" is high, indicating that it may be overvalued (based on projected earnings growth).")
if pegRatio == 1:
    print("The PEG Ratio for "+name+" is 1, indicating that it is close to fair value.")
if pegRatio < 1:
    print("The PEG Ratio for "+name+" is low, indicating that it may be undervalued (based on projected earnings growth).")

This was the error Traceback (most recent call last): line 29, in industry = stock.info['industry'] KeyError: 'industry'

My main question is how do I get the code to basically ignore the error and run the rest of the code?

that's called "error handling" and you can find plenty of info about that online. — Nicolas Gervais
– Nicolas Gervais, Commented May 23, 2020 at 21:52
If you want to post code here do ``` all lines of your code here ``` — Riley
– Riley, Commented May 23, 2020 at 21:53

hc_dev · Accepted Answer · 2021-07-11 00:04:33Z

1

Error Handling in Python

Like Nicolas commented already, you will find many tutorials, blog posts and videos in the web. Also some basic Python books that cover "Error Handling".

The control-structure in Python consists of at least 2 keywords try and except, often named try-except block. There are also 2 optional keywords else and finally.

How to wrap your failing statements

import yfinance as yf

try: # st art watching for errors
  stock = yf.Ticker(stock)  # the API call may also fail, e.g. no connection
  pegRatio = stock.info['pegRatio']  # here your actual exception was thrown
except KeyError:  # catch unspecific or specific errors/exceptions
  # handling this error type begins here: print and return
  print "Error: Could not find PEG Ratio in Yahoo! Finance response!"
  return 

# the happy path continues here: with pegRatio
print(pegRatio)
if pegRatio > 1:
    print("The PEG Ratio for "+name+" is high, indicating that it may be overvalued (based on projected earnings growth).")
if pegRatio == 1:
    print("The PEG Ratio for "+name+" is 1, indicating that it is close to fair value.")
if pegRatio < 1:
    print("The PEG Ratio for "+name+" is low, indicating that it may be undervalued (based on projected earnings growth).")

edited Jul 11, 2021 at 0:04

answered Jul 10, 2021 at 23:58

hc_dev

9,6941 gold badge30 silver badges47 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Peterino Over a year ago

Raymond Hettinger suggests that it's more idiomatic to ignore ("suppress") expected errors and exceptions when it would otherwise just make the code more verbose and less readable. Use contextlib.suppress for that. See stackoverflow.com/a/15566001/202834

Collectives™ on Stack Overflow

How to ignore "KeyError" in Python

1 Answer 1

Error Handling in Python

How to wrap your failing statements

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Error Handling in Python

How to wrap your failing statements

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related