for loop not executing using Python console

Question

I have this script to load CSV data to 2D array ( I hope... :) )

with open("csv") as textFile:
    lines = [line.strip().split(",") for line in textFile]

Also I can get all data with this, or only some bite of data

print (lines)
print (lines[0][0])

However, I can't get all data with for loop, any idea ?

>>> for i in range (0,3):
...     for j in range (0,3):
...         print (lines([i][j])
... 
... 
...

What the the problem with your loop code? Is it not getting the data from lines? — Hymns For Disco
– Hymns For Disco, Commented Apr 7, 2020 at 8:51
I suggest you use a csv.reader to read the rows of data into your list. — martineau
– martineau, Commented Apr 7, 2020 at 9:01
nothing, I get 3 dots only.... >> for i in range (0,3): ... for j in range (0,3): ... print (lines([i][j]) ... ... ... ... ... ... ... ... ... ... — andrew
– andrew, Commented Apr 7, 2020 at 9:01
I think, problem is somwhere else in logic or syntax, because I can get data with: print (lines);print (lines[0][0]); print (lines[1][1); — andrew
– andrew, Commented Apr 7, 2020 at 9:07

Tomerikoo · Accepted Answer · 2020-04-07 09:45:35Z

2

It sounds like you are just experiencing one of the down-sides of using IDLE or a similar Python console. I will try to demonstrate the issue step-by-step.

The | represents the current cursor's location

We start by writing a simple for-loop:

>>> for i in range(3):|

Now, if we press Enter twice:

>>> for i in range(3):
...    
...    |

Now if we press the Up-arrow and write a print statement:

>>> for i in range(3):
...    print(i)|
...

Now if you press Enter again you will just get:

>>> for i in range(3):
...    print(i)
...    |
...

But if you press Delete you will go back to:

>>> for i in range(3):
...    print(i)
...    |

and now pressing Enter will actually execute the loop:

>>> for i in range(3):
...     print(i)
...         
0
1
2

answered Apr 7, 2020 at 9:45

Tomerikoo

19.6k16 gold badges57 silver badges68 bronze badges

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

Collectives™ on Stack Overflow

for loop not executing using Python console

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related