Alphabet Pattern 'R' in Python

Code:

str="";
for Row in range(0,7):
    for Col in range(0,7):
        if (Col == 1 or ((Row == 0 or Row == 3) and Col > 1 and Col < 5) or (Col == 5 and Row != 0 and Row < 3) or (Col == Row - 1 and Row > 2)):
            str=str+"*"
        else:
            str=str+" "
    str=str+"\n"
print(str);

Output: