Python Program to Convert Matrix to String

Given a matrix, our task is to write a Python program to convert to the matrix, with different delimiters for element and row separation.

Examples:

Input : test_list = test_list = [[1, 3, “gfg”], [2, “is”, 4], [“best”, 9, 5]], in_del, out_del = “,”, ” “

Output : 1,3,gfg 2,is,4 best,9,5

Explanation : Element in list separated by “,”, and lists separated by ” “.

Input : test_list = test_list = [[1, 3, “gfg”], [2, “is”, 4], [“best”, 9, 5]], in_del, out_del = “,”, “-“

Output : 1,3,gfg-2,is,4-best,9,5

Explanation : Element in list separated by “,”, and lists separated by “-“.

Method #1 : Using join() + list comprehension

In this, we perform task of iterating each element of each row using list comprehension. The inner and outer join for element and row with different delimiters using join().

Python3

# Python3 code to demonstrate working of
# Convert Matrix to String
# Using list comprehension + join()

# initializing list
test_list = [[1, 3, "gfg"], [2, "is", 4], ["best", 9, 5]]

# printing original list
print("The original list is : " + str(test_list))

# initializing delims
in_del, out_del = ",", " "

# nested join using join()
res = out_del.join([in_del.join([str(ele) for ele in sub]) for sub in test_list])

# printing result
print("Conversion to String : " + str(res))

Output:

The original list is : [[1, 3, ‘gfg’], [2, ‘is’, 4], [‘best’, 9, 5]]

Conversion to String : 1,3,gfg 2,is,4 best,9,5

Method #2 : Using map() + join()

In this, task of inner joining of elements is extending to each character using map(). Rest all the functionalities are similar to upper method.

Python3

# Python3 code to demonstrate working of
# Convert Matrix to String
# Using map() + join()

# initializing list
test_list = [[1, 3, "gfg"], [2, "is", 4], ["best", 9, 5]]

# printing original list
print("The original list is : " + str(test_list))

# initializing delims
in_del, out_del = ",", " "

# nested join using join()
# map() for joining inner elements
res = out_del.join(in_del.join(map(str, sub)) for sub in test_list)

# printing result
print("Conversion to String : " + str(res))

Output:

The original list is : [[1, 3, ‘gfg’], [2, ‘is’, 4], [‘best’, 9, 5]]

Conversion to String : 1,3,gfg 2,is,4 best,9,5