Alphabet Pattern 'K' in Python

Code:

str="";
j = 5;
i = 0;
for Row in range(0,7):
    for Col in range(0,7):
        if (Col == 1 or ((Row == Col + 1) and Col != 0)):
            str=str+"*"
        elif (Row == i and Col == j):
              str=str+"*"
              i=i+1
              j=j-1
        else:
            str=str+" "
    str=str+"\n"
print(str);

Output: