How to Iterate through cur.fetchall() in Python

Question

I am working on database connectivity in Python 3.4. There are two columns in my database.

Below is the query which gives me all the data from two columns in shown f

Answer 1

It looks like you have two colunms in the table, so each row will contain two elements.

It is easiest to iterate through them this way:

for column1, column2 in data:

That is the same as:

for row in data:
    column1, column2 = row

You could also, as you tried:

for row in data:
    print row[0] # or row[i]
    print row[1] # or row[j]

But that failed because you overwrote i with the value of first column, in this line: for i, row in data:.

EDIT

BTW, in general, you will never need this pattern in Python:

i = 0
for ...:
    ...
    i += 1

Instead of that, it is common to do simply:

for item in container:
    # use item

# or, if you really need i:
for i, item in enumerate(container):
    # use i and item