Trying to use nested for loop to correctly parse nested list items

Question

I have a nested list (derived from a psycopg2 psql query) that contains a list of company names, stock tickers, and industries. I am using a subsequent nested for loop to try and extract the 1st (company name) and 3rd (industry) elements from the nested list rows in subsequent print statements.

In this example, the company name is American Airlines, the stock ticker is AAL, and the industry is Airlines.

postgreSQL query:

# psycopg2 query to pull company name and industry based on stock ticker
  cur.execute('SELECT company,stockTicker,industry FROM stockNames WHERE 
  stockTicker = %s',(stockChoice,))
  records=cur.fetchall()

My current nested for loop is as follows:

for i in records:
     for j in i:
          count=0
          if count==0:
               print('n' 'Company Name: ',j)
               print('Stock Ticker: ',stockChoice)
               continue
          if count==1:
               continue
          if count==2:               
               print('Industry: ',list,j)
               print('Stock Price: ',stockPrice.text)
               continue
          count+=1

And the output is:

Company Name:  American Airlines
Stock Ticker:  AAL

Company Name:  AAL
Stock Ticker:  AAL

Company Name:  Airlines
Stock Ticker:  AAL

My expected output is this:

Company Name: American Airlines
Stock Ticker: AAL
Industry: Airlines

Any help on this is appreciated to get the control flow right for what I’m trying to do.

Asked By: jon bon journo

||

Source

Answer 1

Don’t use nested loops. Just unpack each row into variables

for company, ticker, industry in records:
    print(f'Company name: {company}nStock ticker: {ticker}nIndustry: {industry}n')

And if you’re only getting the information for one stock, there’s no need for the loop at all.

cur.execute('SELECT company,stockTicker,industry FROM stockNames WHERE stockTicker = %s',(stockChoice,))
row = cur.fetchone()
if row:
    company, ticker, industry = row
    print(f'Company name: {company}nStock ticker: {ticker}nIndustry: {industry}n')

Answered By: Barmar

Trying to use nested for loop to correctly parse nested list items

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