To print series 1,12,123,1234......py

# master
def num(a):

    # initialising starting number

    num = 1

    # outer loop to handle number of rows

    for i in range(0, a):

        # re assigning num

        num = 1

        # inner loop to handle number of columns

        # values changing acc. to outer loop

        for k in range(0, i + 1):

            # printing number

            print(num, end=" ")

            # incrementing number at each column

            num = num + 1

        # ending line after each row

        print("\r")


# Driver code

a = 5

num(a)
# =======
# 1-12-123-1234 Pattern up to n lines

n = int(input("Enter number of rows: "))

for i in range(1, n + 1):
    for j in range(1, i + 1):
        print(j, end="")
    print()

# master