Python declare 2d list

How to create 2d list in python

o=[]
for i in range(0,rows):
    x=[]
    for j in range(0,cols):
        x.append(0)
    o.append(x)
#if you use [[0]*cols]*rows all rows will become the same list
#so editing in one row will edit all rows

Python declare 2d list

length, breadth = x, y
matrix = [[-1 for j in range(breadth)] for i in range(length)]
# every element is -1

Similar codes

0 vote131 views3 answers
How to count null values in pandas and return as percentage
Python
1 vote119 views1 answer
Tkinter listbox delete all items
Python
0 vote125 views1 answer
Python matplotlib pyplot set axis equals
Python
0 vote130 views1 answer
ImportError: cannot import name 'config' from 'decouple' (C:\Users\Yemi\AppData\Local\Programs\Python\Python310\lib\site-packages\decouple\__init__.py)
Python
0 vote116 views1 answer
Pandas normalize rows to max value
Python
0 vote153 views1 answer
Module installed but not found python
Python
1 vote134 views1 answer
Ipython save session
Python
0 vote132 views1 answer
Get random line from file python
Python
11 votes176 views3 answers
Python list except last element
Python
7 votes92 views1 answer
Data frame do nympy
Python