Index in Python list contains multiple elements. How to access each and pass them to different function?

Question

I have written a code in Python 3 that extracts values from a table(.csv) using pandas and appends them to a list. My code is:

import os
import numpy as np
import csv
import pandas as pd
from generate_xml import write_xml

# global constants
img = None
tl_list = []
br_list = []
object_list = []
tl_x = []
tl_y = []
br_x =[]
br_y =[]


# constants
obj = 'red_hat'

df = pd.read_csv('ring_1_05_sam.csv')
tl_x = df.iloc[5:10, 0:1] - 30
tl_y = df.iloc[5:10, 1:2] - 30
br_x = df.iloc[5:10, 0:1] + 30
br_y = df.iloc[5:10, 1:2] + 30
tl_x = (tl_x.to_string(index=False, header=False))
tl_y = (tl_y.to_string(index=False, header=False))
br_x = (br_x.to_string(index=False, header=False))
br_y = (br_y.to_string(index=False, header=False))
tl_list = (tl_x, tl_y)
br_list = (br_x, br_y)
object_list.append(obj)

print(tl_list[0])

This gives me an output of

So as you can see, my index[0] at tl_list[] has these 4 elements. My question is how do i access them individually? To be more specific, I want to pass each value to a function, one at a time

import os
import numpy as np
import csv
import pandas as pd
from generate_xml import write_xml

# global constants
img = None
tl_list = []
br_list = []
object_list = []
tl_x = []
tl_y = []
br_x =[]
br_y =[]


# constants
obj = 'red_hat'

df = pd.read_csv('ring_1_05_sam.csv')
tl_x = df.iloc[5:10, 0:1] - 30
tl_y = df.iloc[5:10, 1:2] - 30
br_x = df.iloc[5:10, 0:1] + 30
br_y = df.iloc[5:10, 1:2] + 30
tl_x = (tl_x.to_string(index=False, header=False))
tl_y = (tl_y.to_string(index=False, header=False))
br_x = (br_x.to_string(index=False, header=False))
br_y = (br_y.to_string(index=False, header=False))
tl_list = (tl_x, tl_y)
br_list = (br_x, br_y)
object_list.append(obj)

write_xml(image_folder, img, object_list, tl_list, br_list, savedir)
tl_list = []
br_list = []
object_list = []
img = None

So that my write_xml function takes the first value at tl_list and br_list then the next value sequentially. Right now it tales all values at once. Any ideas how i can do it?

blhsing · Accepted Answer · 2018-11-30 14:17:33Z

1

You can split the string and iterate through the resulting list:

for tl in tl_list[0].split():
    write_xml(image_folder, img, object_list, tl, br_list, savedir)

answered Nov 30, 2018 at 14:17

blhsing

109k9 gold badges89 silver badges132 bronze badges

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

5 Comments

Shameendra Over a year ago

Thanks. I will try it out as soon as i have time and let you know if it works

Shameendra Over a year ago

i get this error when i try to run the code for tl in tl_list[0].split(): AttributeError: 'tuple' object has no attribute 'split'

blhsing Over a year ago

I think you must missed the [0] part.

Shameendra Over a year ago

This is the input i gave for tl in tl_list[0].split(): write_xml(image_folder, img, object_list, tl, br_list, savedir)

blhsing Over a year ago

Well in that case tl_list[0] is not a string but a tuple. Try tl_list[0][0].split() then.

Collectives™ on Stack Overflow

Index in Python list contains multiple elements. How to access each and pass them to different function?

1 Answer 1

5 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

5 Comments

Your Answer

Sign up or log in

Post as a guest

Related