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python program to take nested list input ...(nested list addition ,substraction etc)

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Tue Mar 13 14:25:56 2018

@author: beast
Note this program is for holding int value to list only """
def inmatrix():
    matrixA=list() # intialize matrix as empty list
   
    
    try:
        row,col=[int(j) for j in (input("Enter the row and col ").split())]
        print(row,col)
        inp=""
    except ValueError:
            print("Please Enter row and col seperated by space eg: 2 2") 
            inmatrix()
    
    for i in range(row):
        for j in range(col):
            inp+=((input("Enter the number--->"))+",")
        try:
            lst=[int(a) for a in inp.split(",") if a!=""]#delete int for making it to hold any data 
            # create a list using input row string 
            matrixA.append(lst) #add the row wise data 
            inp="" #after eacch row input reset inp to get next input 
        except ValueError:
            print("please Enter Integer Only as list input\n\a------ Restarting ---\n")
            inmatrix()
    return matrixA
#    print(matrixA)     

    
if __name__=="__main__":
    try:
        print(inmatrix())   
    except Exception:
        print("please Give Correct Input\n")
        inmatrix()

this below code is alternate version for accepting anything(character as nested list input )..

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Tue Mar 13 14:25:56 2018

@author: beast
Note this program is for holding int value to list only """
def inmatrix():
    matrixA=list() # intialize matrix as empty list
   
    
    try:
        row,col=[int(j) for j in (input("Enter the row and col ").split())]
        print(row,col)
        inp=""
    except ValueError:
            print("Please Enter row and col seperated by space eg: 2 2") 
            inmatrix()
    
    for i in range(row):
        for j in range(col):
            inp+=((input("Enter the number--->"))+",")
        try:
            lst=[a for a in inp.split(",") if a!=""]#delete int for making it to hold any data 
            # create a list using input row string 
            matrixA.append(lst) #add the row wise data 
            inp="" #after eacch row input reset inp to get next input 
        except Exception:
            print("\n--AN ERROR occured while taking input to list,please try again\n")
            inmatrix()
    return matrixA
#    print(matrixA)     

    
if __name__=="__main__":
    try:
        print(inmatrix())   
    except Exception:
        print("please Give Correct Input\n")
        inmatrix()

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