Alphabet Pattern 'O' in Python

Code:

str="";
for Row in range(0,7):
    for Col in range(0,7):
        if (((Col == 1 or Col == 5) and Row != 0 and Row != 6) or ((Row == 0 or Row == 6) and Col > 1 and Col < 5)):
            str=str+"*"
        else:
            str=str+" "
    str=str+"\n"
print(str);

Output: