我的元组怎么了？

Question

I created a function to take in a text file with such data:

2012-01-01  09:00   Angel   Men's Clothing  214.05  Amex
2012-01-01  09:00   Ben Women's Clothing    153.57  Visa
2012-01-01  09:00   Charlie Music   66.08   Cash

and it converts that into a list of tuples:

Code : myList = [tuple(j.split("\t")) for j in stringX.split("\n")]
Result:
[('2012-01-01', '09:00', 'Angel', "Men's Clothing", '214.05', 'Amex'), 
('2012-01-01', '09:00', 'Ben', "Women's Clothing", '153.57', 'Visa'), 
('2012-01-01', '09:00', 'Charlie', 'Music', '66.08', 'Cash')]

And further converts it into this:

Code: nameList = [(float(item[4]),item[2])for item in myList]
Result: [(214.05, 'Angel'), (153.57, 'Ben'), (66.08, 'Charlie')]

With that small sized text file, its running perfectly. But I have to convert a big text file that is over 200 MB with over 1 million lines. It manages to convert into list of tuples but it doesn't convert further into the smaller list of tuples as shown above.

It gives me the error when i run the program with the Big File:

File "C:\Users\Charlie\Desktop\PYC\PYTHON ASSIGNMENT\test3.py", line 34, in <listcomp>
nameList = [(float(item[4]),item[2])for item in myList]
IndexError: tuple index out of range

Answer 1

You tuple has an empty entry that is why you are getting "IndexError: tuple index out of range"

You can add an if condition to validate if the tuple has any values in it.

EX:

myList = [('2012-01-01', '09:00', 'Angel', "Men's Clothing", '214.05', 'Amex'), 
('2012-01-01', '09:00', 'Ben', "Women's Clothing", '153.57', 'Visa'),
(), 
('2012-01-01', '09:00', 'Charlie', 'Music', '66.08', 'Cash')]


nameList = [(float(item[4]),item[2])for item in myList if item]
print nameList
[(214.05, 'Angel'), (153.57, 'Ben'), (66.08, 'Charlie')]