read google bucket files using python

I have to read google bucket files which are in xlsx format. The file structure in the bucket look like

bucket_name
       folder_name_1
               file_name_1
       folder_name_2
       folder_name_3
                file_name_3

The python snippet looks like

def main():
    storage_client = storage.Client.from_service_account_json(
        Constants.GCP_CRENDENTIALS)
    bucket = storage_client.bucket(Constants.GCP_BUCKET_NAME)

    blob = bucket.blob(folder_name_2 + '/' + Constants.GCP_FILE_NAME)

    data_bytes = blob.download_as_bytes()

    df = pd.read_excel(data_bytes, engine='openpyxl')
    print(df)

def function1():
     print("no file in the folder") # sample error

In the above snippet, I'm trying to open folder_name_2, it returns an error because there's no file to read.

Instead of throwing an error, I need to use function1 to print the error whenever there's no file in any folder.

Any ideas of doing this?

I'm not familiar with the GCP API, but you're going to want to do something along the lines of this:

try:
    blob = bucket.blob(folder_name_2 + '/' + Constants.GCP_FILE_NAME)
    data_bytes = blob.download_as_bytes()
except Exception as e:
    print(e)

https://docs.python.org/3/tutorial/errors.html#handling-exceptions